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Woo JY, Park MH, Jeong SH, Kim YH, Kim B, Lee TW, Han TH. Advances in Solution-Processed OLEDs and their Prospects for Use in Displays. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2207454. [PMID: 36300804 DOI: 10.1002/adma.202207454] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 10/05/2022] [Indexed: 06/16/2023]
Abstract
This review outlines problems and progress in development of solution-processed organic light-emitting diodes (SOLEDs) in industry and academia. Solution processing has several advantages such as low consumption of materials, low-cost processing, and large-area manufacturing. However, use of a solution process entails complications, such as the need for solvent resistivity and solution-processable materials, and yields SOLEDs that have limited luminous efficiency, severe roll-off characteristics, and short lifetime compared to OLEDs fabricated using thermal evaporation. These demerits impede production of practical SOLED displays. This review outlines the industrial demands for commercial SOLEDs and the current status of SOLED development in industries and academia, and presents research guidelines for the development of SOLEDs that have high efficiency, long lifetime, and good processability to achieve commercialization.
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Affiliation(s)
- Joo Yoon Woo
- Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Min-Ho Park
- Department of Organic Materials and Fiber Engineering, Soongsil University, 369 Sangdo-Ro, Dongjak-Gu, Seoul, 06978, Republic of Korea
| | - Su-Hun Jeong
- Future Technology Research Center, LG Chem, Ltd., 30, Magokjunang 10-ro, Gangseo-gu, Seoul, 07794, Republic of Korea
| | - Young-Hoon Kim
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Byungjae Kim
- Future Technology Research Center, LG Chem, Ltd., 30, Magokjunang 10-ro, Gangseo-gu, Seoul, 07794, Republic of Korea
| | - Tae-Woo Lee
- Department of Materials Science and Engineering, School of Chemical and Biological Engineering, Institute of Engineering Research, Research Institute of Advanced Materials, Soft Foundry, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Tae-Hee Han
- Division of Materials Science and Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
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2
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Macionis S, Gudeika D, Volyniuk D, Mahmoudi M, Simokaitiene J, Andruleviciene V, Najafov M, Sadzeviciene R, Stoncius S, Grazulevicius JV. Effect of Substituents with the Different Electron-Donating Abilities on Optoelectronic Properties of Bipolar Thioxanthone Derivatives. ACS APPLIED ELECTRONIC MATERIALS 2023; 5:2227-2238. [PMID: 37124238 PMCID: PMC10134433 DOI: 10.1021/acsaelm.3c00092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 02/27/2023] [Indexed: 05/03/2023]
Abstract
The synthesis and optoelectronic properties of four simple-structure thioxanthone derivatives employing thioxanthone as an acceptor unit, coupled with moieties having very different electron-donating abilities such as phenoxazine, 3,6-di-tert-butylcarbazole, 3,7-di-tert-butylphenothiazine, or 2,7-di-tert-butyl-9,9-dimethylacridane, are reported. The compounds form molecular glasses with glass transition temperatures reaching 116 °C. Ionization potentials of the compounds estimated by photoelectron emission method range from 5.42 to 5.74 eV. Thioxanthone derivatives containing 3,6-tert-butylcarbazole or 2,7-di-tert-butyl-9,9-dimethylacridane moieties with weak electron-donating strengths were characterized by bipolar charge transport with relatively close hole and electron mobility values of 6.8 × 10-5/2.4 × 10-5 and 3.1 × 10-5/4.6 × 10-6 cm2/(V s) recorded at 3.6 × 105 V/cm. The other compounds demonstrated hole-transporting properties. The films of thioxanthones containing phenoxazine or 2,7-di-tert-butyl-9,9-dimethylacridane moieties showed efficient thermally activated delayed fluorescence with a photoluminescence quantum yield of up to 50% due to the solid-state luminescence enhancement. Organic-light-emitting diodes containing the synthesized compounds as emitters showed very different external quantum efficiencies (0.9-10.3%) and blue, sky blue, green, or yellow electroluminescence colors, thus reflecting the effects of donor substituents.
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Affiliation(s)
- Simas Macionis
- Department
of Polymer Chemistry and Technology, Kaunas
University of Technology, K. Barsausko st. 59, LT-51423 Kaunas, Lithuania
| | - Dalius Gudeika
- Department
of Polymer Chemistry and Technology, Kaunas
University of Technology, K. Barsausko st. 59, LT-51423 Kaunas, Lithuania
| | - Dmytro Volyniuk
- Department
of Polymer Chemistry and Technology, Kaunas
University of Technology, K. Barsausko st. 59, LT-51423 Kaunas, Lithuania
| | - Malek Mahmoudi
- Department
of Polymer Chemistry and Technology, Kaunas
University of Technology, K. Barsausko st. 59, LT-51423 Kaunas, Lithuania
| | - Jurate Simokaitiene
- Department
of Polymer Chemistry and Technology, Kaunas
University of Technology, K. Barsausko st. 59, LT-51423 Kaunas, Lithuania
| | - Viktorija Andruleviciene
- Department
of Polymer Chemistry and Technology, Kaunas
University of Technology, K. Barsausko st. 59, LT-51423 Kaunas, Lithuania
| | - Murad Najafov
- Department
of Polymer Chemistry and Technology, Kaunas
University of Technology, K. Barsausko st. 59, LT-51423 Kaunas, Lithuania
| | - Rita Sadzeviciene
- Department
of Organic Chemistry, Center for Physical
Sciences and Technology, Sauletekio Ave. 3, LT-10257 Vilnius, Lithuania
| | - Sigitas Stoncius
- Department
of Organic Chemistry, Center for Physical
Sciences and Technology, Sauletekio Ave. 3, LT-10257 Vilnius, Lithuania
| | - Juozas V. Grazulevicius
- Department
of Polymer Chemistry and Technology, Kaunas
University of Technology, K. Barsausko st. 59, LT-51423 Kaunas, Lithuania
- Email
for J.V.G.:
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3
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Bezvikonnyi O, Bernard RS, Andruleviciene V, Volyniuk D, Keruckiene R, Vaiciulaityte K, Labanauskas L, Grazulevicius JV. Derivatives of Imidazole and Carbazole as Bifunctional Materials for Organic Light-Emitting Diodes. MATERIALS (BASEL, SWITZERLAND) 2022; 15:8495. [PMID: 36499990 PMCID: PMC9739035 DOI: 10.3390/ma15238495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 11/24/2022] [Accepted: 11/26/2022] [Indexed: 06/17/2023]
Abstract
New derivatives of carbazole and diphenyl imidazole for potential multiple applications were synthesized and investigated. Their properties were studied by thermal, optical, photophysical, electrochemical, and photoelectrical measurements. The compounds exhibited relatively narrow blue light-emission bands, which is favorable for deep-blue electroluminescent devices. The synthesized derivatives of imidazole and carbazole were tested as fluorescent emitters for OLEDs. The device showed deep-blue emissions with CIE color coordinates of (0.16, 0.08) and maximum quantum efficiency of 1.1%. The compounds demonstrated high triplet energy values above 3.0 eV and hole drift mobility exceeding 10-4 cm2/V·s at high electric fields. One of the compounds having two diphenyl imidazole moieties and tert-butyl-substituted carbazolyl groups showed bipolar charge transport with electron drift mobility reaching 10-4 cm2/V·s at electric field of 8 × 105 V/cm. The synthesized compounds were investigated as hosts for green, red and sky-blue phosphorescent OLEDs. The green-, red- and sky-blue-emitting devices demonstrated maximum quantum efficiencies of 8.3%, 6.4% and 7.6%, respectively.
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Affiliation(s)
- Oleksandr Bezvikonnyi
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko g. 59, LT-51423 Kaunas, Lithuania
- Department of Physics, Faculty of Mathematics and Natural Science, Kaunas University of Technology, Studentų g. 50, LT-51369 Kaunas, Lithuania
| | - Ronit Sebastine Bernard
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko g. 59, LT-51423 Kaunas, Lithuania
| | - Viktorija Andruleviciene
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko g. 59, LT-51423 Kaunas, Lithuania
| | - Dmytro Volyniuk
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko g. 59, LT-51423 Kaunas, Lithuania
| | - Rasa Keruckiene
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko g. 59, LT-51423 Kaunas, Lithuania
| | - Kamile Vaiciulaityte
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko g. 59, LT-51423 Kaunas, Lithuania
| | - Linas Labanauskas
- Center for Physical Sciences and Technology (FTMC), Department of Organic Chemistry, Sauletekio Ave. 3, LT-10257 Vilnius, Lithuania
| | - Juozas Vidas Grazulevicius
- Department of Polymer Chemistry and Technology, Faculty of Chemical Technology, Kaunas University of Technology, K. Baršausko g. 59, LT-51423 Kaunas, Lithuania
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Yi RH, Lei YC, Tseng YH, Lin YF, Cheng YC, Fang YC, Ho CY, Tsai WW, Chang CH, Lu CW. Imidazolyl-Phenylcarbazole-Based Host Materials and Their Use for Co-host Designs in Phosphorescent OLEDs. Chemistry 2021; 28:e202102966. [PMID: 34766387 DOI: 10.1002/chem.202102966] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Indexed: 01/18/2023]
Abstract
In recent years, owing to the demand for high-efficiency phosphorescent organic light-emitting devices (PhOLEDs), many studies have been conducted on the development of bipolar host materials. A series of imidazolyl-phenylcarbazole-based host materials, i. e., im-CzP, im-CzPCz, im-CzPtBu, and im-OCzP, were synthesized to obtain high-efficiency green and red-emitting PhOLEDs. With im-OCzP as the host, satisfactory peak efficiencies of 22.2 (77.0 cd A-1 and 93.1 lm W-1 ) and 14.1 % (9.0 cd A-1 and 10.1 lm W-1 ) could be obtained, respectively. To further improve the performance of the devices, an electron transport material, bis-4,6-(3,5-di-3-pyridylphenyl)-2-methylpyrimidine (B3PyMPM) was selected to construct a co-hosted system. The efficiency of im-OCzP combined with B3PyMPM forming co-hosts could also achieve high values of 23.0 (80.0 cd A-1 and 98.8 lm W-1 ) and 16.5 % (10.2 cd A-1 and 13.4 lm W-1 ) for green and red PhOLEDs, respectively. These results exhibited that the proposed bipolar hosts have great flexibility in adjusting the carrier balance of EML in OLEDs, demonstrating their ingenious design and high potential.
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Affiliation(s)
- Rong-Huei Yi
- Department of Applied Chemistry, Providence University, Taichung, 43301, Taiwan
| | - Ya-Chun Lei
- Department of Applied Chemistry, Providence University, Taichung, 43301, Taiwan
| | - Yeh-Hsiang Tseng
- Department of Electrical Engineering, Yuan Ze University, Chungli, 32003, Taiwan
| | - Yi-Fan Lin
- Department of Electrical Engineering, Yuan Ze University, Chungli, 32003, Taiwan
| | - Yen-Chia Cheng
- Department of Electrical Engineering, Yuan Ze University, Chungli, 32003, Taiwan
| | - Yu-Chuan Fang
- Department of Applied Chemistry, Providence University, Taichung, 43301, Taiwan
| | - Cheng-Yung Ho
- Department of Mechanical Engineering, Chung Yuan Christian University, Chungli, 32023, Taiwan
| | - Wei-Wen Tsai
- Electronics and Imaging, DuPont de Nemours, Inc., Newark, DE19713, USA
| | - Chih-Hao Chang
- Department of Electrical Engineering, Yuan Ze University, Chungli, 32003, Taiwan
| | - Chin-Wei Lu
- Department of Applied Chemistry, Providence University, Taichung, 43301, Taiwan
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5
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Strategy to improve the efficiency of solution-processed phosphorescent organic light-emitting devices by modified TADF host with tert-butyl carbazole. Tetrahedron 2021. [DOI: 10.1016/j.tet.2020.131869] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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6
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Highly distorted bipolar host material based on benzimidazole and indole derivative for efficient green and red solution-processed PhOLEDs. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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7
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Sathyanarayana R, Kumar V, Pujar G, Poojary B, Shankar MK, Yallappa S. Hydroxy-benzimidazoles as blue-green emitters: Synthesis, structural and DFT studies. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2020.112751] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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8
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Tagare J, Verma N, Tarafder K, Vaidyanathan S. Phenanthroimidazole-based chromophores for organic light-emitting diodes: synthesis, photophysical, and theoretical study. LUMINESCENCE 2020; 35:1338-1349. [PMID: 32510860 DOI: 10.1002/bio.3896] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 05/18/2020] [Accepted: 06/04/2020] [Indexed: 11/08/2022]
Abstract
Organic light-emitting diodes (OLED) are gaining attention and making a significant contribution to the area of lighting and displays technology. The synthesis of new materials that can act as a host as well as emissive materials is crucial and efforts have been made in this direction in this research. Here, four star-shaped fluorophores, with a donor-acceptor (D-A) structure and with triphenylamine and phenanthroimidazole groups with different substitutions at the N1 position of the imidazole moiety, were designed and synthesized. Synthesized fluorophores showed sufficient thermal stability (10% Td in the range 230-280°C). Ultraviolet-visible (UV-vis) spectra of the fluorophores showed multiple absorption bands (bands in the UV region, due to π-π* transitions of the conjugated aromatic portion) and all fluorophores showed blue emission in dichloromethane solution. Electrochemical analysis indicated that all fluorophores had excellent oxidation and reduction characteristics. Theoretical calculations were also performed to better understand the structural and electronic properties of the synthesized fluorophores. All fluorophores had higher triplet (T1 ) energy (ranging from 2.49-2.52 eV) than the widely used green (Ir(ppy)3 -2.4 eV) and red (Ir (piq)2 acac - 2.2 eV) dopant materials. These results indicated that these fluorophores would be useful as host materials for efficient green and red phosphorescent OLEDs.
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Affiliation(s)
- Jairam Tagare
- Department of Chemistry, National Institute of Technology Rourkela, Rourkela, Odisha, India
| | - Niraj Verma
- Department of Chemistry, National Institute of Technology Rourkela, Rourkela, Odisha, India
| | - Kartick Tarafder
- Department of Physics, National Institute of Technology Karnataka Surathkal, India
| | - Sivakumar Vaidyanathan
- Department of Chemistry, National Institute of Technology Rourkela, Rourkela, Odisha, India
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9
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Wang Q, Lucas F, Quinton C, Qu YK, Rault-Berthelot J, Jeannin O, Yang SY, Kong FC, Kumar S, Liao LS, Poriel C, Jiang ZQ. Evolution of pure hydrocarbon hosts: simpler structure, higher performance and universal application in RGB phosphorescent organic light-emitting diodes. Chem Sci 2020; 11:4887-4894. [PMID: 34122944 PMCID: PMC8159222 DOI: 10.1039/d0sc01238f] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In the field of phosphorescent organic light-emitting diodes (PhOLEDs), designing high-efficiency universal host materials for red, green and blue (RGB) phosphors has been quite a challenge. To date, most of the high-efficiency universal hosts reported incorporate heteroatoms, which have a crucial role in the device performance. However, the introduction of different kinds of heterocycles increases the design complexity and cost of the target material and also creates potential instability in the device performance. In this work, we show that pure aromatic hydrocarbon hosts designed with the 9,9′-spirobifluorene scaffold are high-efficiency and versatile hosts for PhOLEDs. With external quantum efficiencies of 27.3%, 26.0% and 27.1% for RGB PhOLEDs respectively, this work not only reports the first examples of high-efficiency pure hydrocarbon materials used as hosts in RGB PhOLEDs but also the highest performance reported to date for a universal host (including heteroatom-based hosts). This work shows that the PHC design strategy is promising for the future development of the OLED industry as a high-performance and low-cost option. In this work, we propose pure hydrocarbon materials as universal hosts for high-efficiency red, green and blue phosphorescent organic light-emitting diodes.![]()
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Affiliation(s)
- Qiang Wang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University Suzhou Jiangsu 215123 China
| | - Fabien Lucas
- Univ. Rennes, CNRS, ISCR-UMR 6226 F-35000 Rennes France
| | | | - Yang-Kun Qu
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University Suzhou Jiangsu 215123 China
| | | | | | - Sheng-Yi Yang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University Suzhou Jiangsu 215123 China
| | - Fan-Cheng Kong
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University Suzhou Jiangsu 215123 China
| | - Sarvendra Kumar
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University Suzhou Jiangsu 215123 China
| | - Liang-Sheng Liao
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University Suzhou Jiangsu 215123 China
| | - Cyril Poriel
- Univ. Rennes, CNRS, ISCR-UMR 6226 F-35000 Rennes France
| | - Zuo-Quan Jiang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University Suzhou Jiangsu 215123 China
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10
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Recent Advances in Metal-Catalyzed Alkyl–Boron (C(sp3)–C(sp2)) Suzuki-Miyaura Cross-Couplings. Catalysts 2020. [DOI: 10.3390/catal10030296] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Boron chemistry has evolved to become one of the most diverse and applied fields in organic synthesis and catalysis. Various valuable reactions such as hydroborylations and Suzuki–Miyaura cross-couplings (SMCs) are now considered as indispensable methods in the synthetic toolbox of researchers in academia and industry. The development of novel sterically- and electronically-demanding C(sp3)–Boron reagents and their subsequent metal-catalyzed cross-couplings attracts strong attention and serves in turn to expedite the wheel of innovative applications of otherwise challenging organic adducts in different fields. This review describes the significant progress in the utilization of classical and novel C(sp3)–B reagents (9-BBN and 9-MeO-9-BBN, trifluoroboronates, alkylboranes, alkylboronic acids, MIDA, etc.) as coupling partners in challenging metal-catalyzed C(sp3)–C(sp2) cross-coupling reactions, such as B-alkyl SMCs after 2001.
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11
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Kim MJ, Ahn M, Shim JH, Wee KR. Terphenyl backbone-based donor–π–acceptor dyads: geometric isomer effects on intramolecular charge transfer. Phys Chem Chem Phys 2020; 22:3370-3378. [DOI: 10.1039/c9cp06466d] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The molecular geometry effects of ortho, meta, and para-terphenyl based donor–π–acceptor (D–π–A) dyads on intramolecular charge transfer (ICT) were studied to investigate structure-ICT relationships.
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Affiliation(s)
- Min-Ji Kim
- Department of Chemistry
- Daegu University
- Gyeongsan
- Republic of Korea
| | - Mina Ahn
- Department of Chemistry
- Daegu University
- Gyeongsan
- Republic of Korea
| | - Jun Ho Shim
- Department of Chemistry
- Daegu University
- Gyeongsan
- Republic of Korea
| | - Kyung-Ryang Wee
- Department of Chemistry
- Daegu University
- Gyeongsan
- Republic of Korea
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12
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Wang TT, Luo W, Li HC, Sun SQ, Zhu XD, Khan A, Fung MK, Liao LS, Jiang ZQ. Design and Synthesis of Donor−σ–π–σ–Acceptor-Type Dispiro Molecules. Org Lett 2019; 21:5281-5284. [DOI: 10.1021/acs.orglett.9b01884] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tong-Tong Wang
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China
| | - Wei Luo
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China
| | - Hong-Cheng Li
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China
| | - Shuang-Qiao Sun
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China
| | - Xiang-Dong Zhu
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China
| | - Aziz Khan
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China
| | - Man-Keung Fung
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China
| | - Liang-Sheng Liao
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China
| | - Zuo-Quan Jiang
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China
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13
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Management of transition dipoles in organic hole-transporting materials under solar irradiation for perovskite solar cells. Nat Commun 2018; 9:4537. [PMID: 30382104 PMCID: PMC6208393 DOI: 10.1038/s41467-018-06998-1] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Accepted: 10/10/2018] [Indexed: 11/29/2022] Open
Abstract
In organic hole-transporting material (HTM)-based p−i−n planar perovskite solar cells, which have simple and low-temperature processibility feasible to flexible devices, the incident light has to pass through the HTM before reaching the perovskite layer. Therefore, photo-excited state of organic HTM could become important during the solar cell operation, but this feature has not usually been considered for the HTM design. Here, we prove that enhancing their property at their photo-excited states, especially their transition dipole moments, can be a methodology to develop high efficiency p−i−n perovskite solar cells. The organic HTMs are designed to have high transition dipole moments at the excited states and simultaneously to preserve those property during the solar cell operation by their extended lifetimes through the excited-state intramolecular proton transfer process, consequently reducing the charge recombination and improving extraction properties of devices. Their UV-filtering ability is also beneficial to enhance the photostability of devices. In perovskite solar cells, the excited state property of hole-transport layer is not usually considered for the devices. Here the authors design organic hole-transport materials with high transition dipoles having extended lifetime at the excited states to improve the charge extraction of the devices.
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14
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Liu B, Zhu Z, Zhao J, He D, Wang Z, Luo C, Tong Q, Lee C, Tao S. Ternary Acceptor–Donor–Acceptor Asymmetrical Phenanthroimidazole Molecule for Highly Efficient Near‐Ultraviolet Electroluminescence with External Quantum Efficiency (EQE) >4 %. Chemistry 2018; 24:15566-15571. [DOI: 10.1002/chem.201801822] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 07/31/2018] [Indexed: 01/12/2023]
Affiliation(s)
- Bin Liu
- Department of Chemistry and Key Laboratory for, Preparation and Application of Ordered Structural Materials of, Guangdong Province Shantou University Guangdong 515063 P.R. China
- Department of Physics Fudan University Shanghai 200433 P.R. China
| | - Ze‐Lin Zhu
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry City University of Hong Kong Hong Kong SAR P.R. China
| | - Jue‐Wen Zhao
- School of Optoelectronic Information University of Electronic Science and Technology of China (UESTC) Chengdu 610054 P.R. China
| | - Dan He
- Department of Chemistry and Key Laboratory for, Preparation and Application of Ordered Structural Materials of, Guangdong Province Shantou University Guangdong 515063 P.R. China
| | - Zhong‐Yi Wang
- Department of Chemistry and Key Laboratory for, Preparation and Application of Ordered Structural Materials of, Guangdong Province Shantou University Guangdong 515063 P.R. China
| | - Cheng‐Yuan Luo
- Department of Chemistry and Key Laboratory for, Preparation and Application of Ordered Structural Materials of, Guangdong Province Shantou University Guangdong 515063 P.R. China
| | - Qing‐Xiao Tong
- Department of Chemistry and Key Laboratory for, Preparation and Application of Ordered Structural Materials of, Guangdong Province Shantou University Guangdong 515063 P.R. China
| | - Chun‐Sing Lee
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Chemistry City University of Hong Kong Hong Kong SAR P.R. China
| | - Si‐Lu Tao
- School of Optoelectronic Information University of Electronic Science and Technology of China (UESTC) Chengdu 610054 P.R. China
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15
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Chen WC, Yuan Y, Zhu ZL, Jiang ZQ, Su SJ, Liao LS, Lee CS. De novo design of D-σ-A molecules as universal hosts for monochrome and white phosphorescent organic light-emitting diodes. Chem Sci 2018; 9:4062-4070. [PMID: 29780535 PMCID: PMC5935058 DOI: 10.1039/c8sc00282g] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Accepted: 03/08/2018] [Indexed: 11/21/2022] Open
Abstract
Novel D–σ–A molecules were developed as single hosts to achieve high performances in monochrome and white organic light-emitting diodes.
Two novel D–σ–A host materials 11,11-bis(9-phenyl-9H-carbazol-3-yl)-11H-benzo[4,5]imidazo[1,2-a]indole (BII–BCz) and 4,4′-(11H-benzo[4,5]imidazo[1,2-a]indole-11,11-diyl)bis(N,N-diphenylaniline) (BII–TPA) are synthesized by using the sp3 carbon attached to a newly designed 11H-benzo[4,5]imidazo[1,2-a]indole building block to link two electron-donating groups. The resulting materials feature high triplet energy levels, good thermal properties and suitable photophysical properties as universal hosts for full-color phosphorescent organic light-emitting diodes (OLEDs). Both BII–BCz and BII–TPA reveal excellent performances in blue, green, yellow, orange and red phosphorescent OLEDs with the same device structure. The employment of the new D–σ–A materials as single hosts in white OLEDs with a simple device structure allows us to achieve state-of-the-art performances. A single-emissive-layer white device based on BII–BCz demonstrates the highest performance with an external quantum efficiency up to 28.2% at 1000 cd m–2. Furthermore, this device displays extremely stable emission spectra, with a ΔCIE of only (0.009, 0.005) from 1000 to 10 000 cd m–2.
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Affiliation(s)
- Wen-Cheng Chen
- Center of Super-Diamond and Advanced Films (COSDAF) , Department of Chemistry , City University of Hong Kong , Hong Kong & City University of Hong Kong Shenzhen Research Institute , Shenzhen , Guangdong , PR China .
| | - Yi Yuan
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Institute of Functional Nano & Soft Materials (FUNSOM) , Collaborative Innovation Center of Suzhou Nano Science and Technology (Nano-CIC) , Soochow University , Suzhou , 215123 , PR China .
| | - Ze-Lin Zhu
- Center of Super-Diamond and Advanced Films (COSDAF) , Department of Chemistry , City University of Hong Kong , Hong Kong & City University of Hong Kong Shenzhen Research Institute , Shenzhen , Guangdong , PR China .
| | - Zuo-Quan Jiang
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Institute of Functional Nano & Soft Materials (FUNSOM) , Collaborative Innovation Center of Suzhou Nano Science and Technology (Nano-CIC) , Soochow University , Suzhou , 215123 , PR China .
| | - Shi-Jian Su
- State Key Laboratory of Luminescent Materials and Devices , Institute of Polymer Optoelectronic Materials and Devices , South China University of Technology , Guangzhou 510640 , PR China
| | - Liang-Sheng Liao
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices , Institute of Functional Nano & Soft Materials (FUNSOM) , Collaborative Innovation Center of Suzhou Nano Science and Technology (Nano-CIC) , Soochow University , Suzhou , 215123 , PR China .
| | - Chun-Sing Lee
- Center of Super-Diamond and Advanced Films (COSDAF) , Department of Chemistry , City University of Hong Kong , Hong Kong & City University of Hong Kong Shenzhen Research Institute , Shenzhen , Guangdong , PR China .
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16
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Barwiolek M, Wojtczak A, Kozakiewicz A, Szczesny R, Babinska M, Skowronski L, Szlyk E. New highly fluorescent silver complexes and their thin films obtained by spin coating method. NEW J CHEM 2018. [DOI: 10.1039/c8nj03801e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Thin, fluorescent films of novel silver(i) complexes were produced using a spin coating method.
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Affiliation(s)
- Magdalena Barwiolek
- Faculty of Chemistry
- Nicolas Copernicus University in Torun
- 87-100 Torun
- Poland
| | - Andrzej Wojtczak
- Faculty of Chemistry
- Nicolas Copernicus University in Torun
- 87-100 Torun
- Poland
| | - Anna Kozakiewicz
- Faculty of Chemistry
- Nicolas Copernicus University in Torun
- 87-100 Torun
- Poland
| | - Robert Szczesny
- Faculty of Chemistry
- Nicolas Copernicus University in Torun
- 87-100 Torun
- Poland
| | - Magdalena Babinska
- Faculty of Chemistry
- Nicolas Copernicus University in Torun
- 87-100 Torun
- Poland
| | - Lukasz Skowronski
- Institute of Mathematics and Physics
- UTP University of Science and Technology
- 85-796 Bydgoszcz
- Poland
| | - Edward Szlyk
- Faculty of Chemistry
- Nicolas Copernicus University in Torun
- 87-100 Torun
- Poland
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17
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Wu JL, Lee YT, Chen CT, Chen CT. Solution-processed Small Molecular Materials: Bulk Heterojunction Organic Photovoltaic Materials, Host Materials for Phosphorescence Organic Light-emitting Diodes, and Nondopant Thermally Activated Delayed Fluorescence Materials. J CHIN CHEM SOC-TAIP 2017. [DOI: 10.1002/jccs.201700244] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Jhao-Lin Wu
- Department of Chemistry; National Taiwan University; Taipei 10617 Taiwan
| | - Yi-Ting Lee
- Department of Chemistry; National Taiwan University; Taipei 10617 Taiwan
| | - Chin-Ti Chen
- Institute of Chemistry; Academia Sinica; Taipei 11529 Taiwan
| | - Chao-Tsen Chen
- Department of Chemistry; National Taiwan University; Taipei 10617 Taiwan
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18
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Konidena RK, Thomas KRJ. Star-Shaped Asymmetrically Substituted Blue Emitting Carbazoles: Synthesis, Photophyscial, Electrochemical and Theoretical Investigations. ChemistrySelect 2017. [DOI: 10.1002/slct.201701336] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Rajendra Kumar Konidena
- Organic Materials Laboratory, Department of Chemistry; Indian Institute of Technology Roorkee; Roorkee − 247667 India
| | - K. R. Justin Thomas
- Organic Materials Laboratory, Department of Chemistry; Indian Institute of Technology Roorkee; Roorkee − 247667 India
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19
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Cai M, Zhang D, Huang T, Song X, Duan L. Multifunctional Materials for High-Performance Double-Layer Organic Light-Emitting Diodes: Comparison of Isomers with and without Thermally Activated Delayed Fluorescence. ACS APPLIED MATERIALS & INTERFACES 2017; 9:17279-17289. [PMID: 28474878 DOI: 10.1021/acsami.7b04253] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Organic light-emitting diodes (OLEDs) with simple structures are attracting a lot of attention nowadays, though their performances are always inferior to those of the more complicated structures as multifunctional materials are rare. Here, we have designed and synthesized multifunctional isomers by combining electron-donating carbazole (Cz) and triphenylamine (TPA) units with electron-accepting triazine (Trz), namely, N-[4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl]-N-[4-(9-phenyl-9H-carbazol-3-yl)phenyl]-[1,1'-biphenyl]-4-amine (CzTPA-p-Trz) and N-[3-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl]-N-[4-(9-phenyl-9H-carbazol-3-yl)phenyl]-[1,1'-biphenyl]-4-amine (CzTPA-m-Trz). The use of multiple electron-donating groups gives them suitable highest occupied molecular orbitals for hole injection and high mobilities for hole transport. Hole-only devices with CzTPA-m-Trz or CzTPA-p-Trz as the hole injection layers and hole transport layers show a higher hole current than the widely used 1,4,5,8,9,11-hexaazatriphenylenehexacarbonitrile/4,4'-N,N'-bis[N-(1-naphthyl)-N-phenylamino]biphenyl system. Interestingly, CzTPA-p-Trz is a fluorescent material with a high photoluminescence quantum yield (PLQY), while CzTPA-m-Trz shows weak thermally activated delayed fluorescence (TADF). As expected, a CzTPA-p-Trz-based undoped double-layer green device achieved a higher external quantum efficiency (EQE) of 4.4% and a higher power efficiency (PE) of 11.8 lm/W. On the other hand, among double-layer devices doped with an orange phosphorescent dopant, a device based on TADF material, CzTPA-m-Trz, achieved higher peak EQE (23.5%) and PE (68.3 lm/W) than those of CzTPA-p-Trz (20.8% and 60.2 lm/W). Even at a high luminance of 5000 cd m-2, a high EQE of 21.8% was retained for CzTPA-m-Trz-based devices. These results are even comparable to those for the state-of-the-art phosphorescent devices based on the same dopant with more complicated structures. The above results indicate that well-designed multifunctional materials are promising for high-performance OLEDs with simple structures.
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Affiliation(s)
- Minghan Cai
- Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University , Beijing 100084, China
| | - Dongdong Zhang
- Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University , Beijing 100084, China
| | - Tianyu Huang
- Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University , Beijing 100084, China
| | - Xiaozeng Song
- Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University , Beijing 100084, China
| | - Lian Duan
- Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University , Beijing 100084, China
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20
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Tagare J, Ulla H, Kajjam AB, Satyanarayan M, Vaidyanathan S. Star‐Shaped Phenanthroimidazole‐Triphenylamine‐Based Yellow Organic Emitter for Organic Light Emitting Diodes. ChemistrySelect 2017. [DOI: 10.1002/slct.201700056] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jairam Tagare
- Optoelectronics LaboratoryDepartment of ChemistryNational Institute of Technology Rourkela India
| | - Hidayath Ulla
- Optoelectronics LaboratoryDepartment of PhysicsNational Institute of Technology Karnataka Surathkal India
| | - Aravind Babu Kajjam
- Optoelectronics LaboratoryDepartment of ChemistryNational Institute of Technology Rourkela India
| | - M.N. Satyanarayan
- Optoelectronics LaboratoryDepartment of PhysicsNational Institute of Technology Karnataka Surathkal India
| | - Sivakumar Vaidyanathan
- Optoelectronics LaboratoryDepartment of ChemistryNational Institute of Technology Rourkela India
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21
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Chen WC, Yuan Y, Ni SF, Zhu ZL, Zhang J, Jiang ZQ, Liao LS, Wong FL, Lee CS. Highly Efficient Deep-Blue Electroluminescence from a Charge-Transfer Emitter with Stable Donor Skeleton. ACS APPLIED MATERIALS & INTERFACES 2017; 9:7331-7338. [PMID: 28185447 DOI: 10.1021/acsami.6b14638] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Organic materials containing arylamines have been widely used as hole-transporting materials as well as emitters in organic light-emitting devices (OLEDs). However, it has been pointed out that the C-N bonds in these arylamines can easily suffer from degradation in excited states, especially in deep-blue OLEDs. In this work, phenanthro[9,10-d]imidazole (PI) is proposed as a potential donor with higher stability than those of arylamines. Using PI as the donor, a donor-acceptor type deep-blue fluorophore 1-phenyl-2-(4″-(1-phenyl-1H-benzo[d]imidazol-2-yl)-[1,1':4',1″-terphenyl]-4-yl)-1H-phenanthro[9,10-d]imidazole (BITPI) is designed and synthesized. Results from UV-aging test on neat films of BITPI and other three arylamine compounds demonstrate that PI is indeed a more stable donor comparing to common arylamines. An OLED using BITPI as an emitter exhibits good device performances (EQE over 7%) with stable deep-blue emission (color index: (0.15, 0.13)) and longer operation lifetime than the similarly structured device using arylamine-based emitter. Single-organic layer device based on BITPI also shows superior performances, which are comparable to the best results from the arylamine-based donor-acceptor emitters, suggesting that PI is a stable donor with good hole transport/injection capability.
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Affiliation(s)
- Wen-Cheng Chen
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Biology and Chemistry, City University of Hong Kong , Hong Kong SAR, PR China
| | - Yi Yuan
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM) & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, PR China
| | - Shao-Fei Ni
- Department of Chemistry, Southern University of Science and Technology , Shenzhen 518055, PR China
| | - Ze-Lin Zhu
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Biology and Chemistry, City University of Hong Kong , Hong Kong SAR, PR China
| | - Jinfeng Zhang
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Biology and Chemistry, City University of Hong Kong , Hong Kong SAR, PR China
| | - Zuo-Quan Jiang
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM) & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, PR China
| | - Liang-Sheng Liao
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM) & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, PR China
| | - Fu-Lung Wong
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Biology and Chemistry, City University of Hong Kong , Hong Kong SAR, PR China
| | - Chun-Sing Lee
- Center of Super-Diamond and Advanced Films (COSDAF) and Department of Biology and Chemistry, City University of Hong Kong , Hong Kong SAR, PR China
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22
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Systematic synthesis, comparative studies of the optical properties, and the ICT-based sensor properties of a series of 2,4,6-tri(5-aryl-2-thienyl)pyrimidines with the D–π–A system. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.05.099] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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23
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Yang Y, Wang KZ, Yan D. Ultralong Persistent Room Temperature Phosphorescence of Metal Coordination Polymers Exhibiting Reversible pH-Responsive Emission. ACS APPLIED MATERIALS & INTERFACES 2016; 8:15489-15496. [PMID: 27253185 DOI: 10.1021/acsami.6b03956] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Ultra-long-persistent room temperature phosphorescence (RTP) materials have attracted much attention and present various applications in illumination, displays, and the bioimaging field; however, the persistent RTP is generally from the inorganic phosphor materials to date. Herein, we show that the metal coordination polymers (CPs) could be new types of emerging long-lived RTP materials for potential sensor applications. First, two kinds of Cd-based CPs, Cd(m-BDC)(H2O) (1) and Cd(m-BDC)(BIM) (2) (m-BDC = 1,3-benzenedicarboxylic acid; BIM = benzimidazole), were obtained through a hydrothermal process, and the samples were found to exhibit two-dimensional layered structures, which are stabilized by interlayer C-H···π interaction and π···π interaction, respectively. The CPs show unexpected second-time-scale ultra-long-persistent RTP after the removal of UV excitation, and this persistent emission can be detected easily on a time scale of 0-10 s. The CPs also feature a tunable luminescence decay lifetime by adjusting their coordination situation and packing fashion of ligands. Theoretical calculation further indicates that the introduction of the second ligand could highly influence the electronic structure and intermolecular electron transfer toward tailoring the RTP of the CP materials. Moreover, CP 2 exhibits well-defined pH- and temperature-dependent phosphorescence responses. Therefore, this work provides a facile way to develop new type of CPs with steady-state and dynamic tuning of the RTP properties from both experimental and theoretical perspectives, which have potential applications in the areas of displays, pH/temperature sensors, and phosphorescence logic gates. On account of suitable incorporation of inorganic and organic building blocks, it can be expected that the ultra-long-persistent RTP CPs can be extended to other similar systems due to the highly tunable structures and facile synthesis routes.
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Affiliation(s)
- Yongsheng Yang
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University , Beijing 100875, People's Republic of China
| | - Ke-Zhi Wang
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University , Beijing 100875, People's Republic of China
| | - Dongpeng Yan
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University , Beijing 100875, People's Republic of China
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China
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24
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Ban X, Sun K, Sun Y, Huang B, Jiang W. Enhanced Electron Affinity and Exciton Confinement in Exciplex-Type Host: Power Efficient Solution-Processed Blue Phosphorescent OLEDs with Low Turn-on Voltage. ACS APPLIED MATERIALS & INTERFACES 2016; 8:2010-2016. [PMID: 26726923 DOI: 10.1021/acsami.5b10335] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A benzimidazole/phosphine oxide hybrid 1,3,5-tris(1-(4-(diphenylphosphoryl)phenyl)-1H-benzo[d]imidazol-2-yl)benzene (TPOB) was newly designed and synthesized as the electron-transporting component to form an exciplex-type host with the conventional hole-transporting material tris(4-carbazoyl-9-ylphenyl)amine (TCTA). Because of the enhanced triplet energy and electron affinity of TPOB, the energy leakage from exciplex-state to the constituting molecule was eliminated. Using energy transfer from exciplex-state, solution-processed blue phosphorescent organic light-emitting diodes (PHOLEDs) achieved an extremely low turn-on voltage of 2.8 V and impressively high power efficiency of 22 lm W(-1). In addition, the efficiency roll-off was very small even at luminance up to 10 000 cd m(-2), which suggested the balanced charge transfer in the emission layer. This study demonstrated that molecular modulation was an effective way to develop efficient exciplex-type host for high performanced PHOLEDs.
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Affiliation(s)
- Xinxin Ban
- School of Chemistry and Chemical Engineering, Southeast University , Nanjing, Jiangsu 211189, People's Republic of China
| | - Kaiyong Sun
- School of Chemistry and Chemical Engineering, Southeast University , Nanjing, Jiangsu 211189, People's Republic of China
| | - Yueming Sun
- School of Chemistry and Chemical Engineering, Southeast University , Nanjing, Jiangsu 211189, People's Republic of China
| | - Bin Huang
- School of Chemistry and Chemical Engineering, Southeast University , Nanjing, Jiangsu 211189, People's Republic of China
| | - Wei Jiang
- School of Chemistry and Chemical Engineering, Southeast University , Nanjing, Jiangsu 211189, People's Republic of China
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25
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Tian G, Wei X, Xiang N, Huang J, Cao J, Wang Z, Zhang J, Su J. Small organic molecules based on oxazole/thiazole with excellent performances in green and red phosphorescent organic light-emitting diodes. RSC Adv 2016. [DOI: 10.1039/c6ra07976h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Four small organic host materials based on oxazole/thiazole have been synthesized and fully characterized. The best performance of compound 2d was a maximum current efficiency of 50.7 cd A−1 for green device and a maximum current efficiency of 18.7 cd A−1 for red device.
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Affiliation(s)
- Guojian Tian
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- PR China
| | - Xiang Wei
- Key Laboratory of Advanced Display and System Applications
- Ministry of Education
- Shanghai University
- Shanghai 200072
- PR China
| | - Ning Xiang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- PR China
| | - Jinhai Huang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- PR China
| | - Jin Cao
- Key Laboratory of Advanced Display and System Applications
- Ministry of Education
- Shanghai University
- Shanghai 200072
- PR China
| | - Zixing Wang
- Key Laboratory of Advanced Display and System Applications
- Ministry of Education
- Shanghai University
- Shanghai 200072
- PR China
| | - Jianhua Zhang
- Key Laboratory of Advanced Display and System Applications
- Ministry of Education
- Shanghai University
- Shanghai 200072
- PR China
| | - Jianhua Su
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- PR China
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26
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Tong BH, Mei QB, Tian RQ, Yang M, Hua QF, Shi YJ, Ye SH. High-brightness solution-processed phosphorescent OLEDs with pyrimidine-based iridium(iii) complexes. RSC Adv 2016. [DOI: 10.1039/c5ra28134b] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
New complexes Ir(ppm)2(pic) and Ir(ppm)2(taz) emitted 555 and 532 nm light, respectively. Solution-processed organic light-emitting diodes based on Ir(ppm)2(taz) showed high-brightness of 125072 cd m−2, peak current efficiencies of 40.4 cd A−1.
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Affiliation(s)
- Bi-hai Tong
- School of Metallurgy Engineering
- Anhui University of Technology
- Maanshan
- China
| | - Qun-bo Mei
- Key Laboratory for Organic Electronics and Information Displays (KLOEID)
- Institute of Advanced Materials (IAM)
- Nanjing University of Posts and Telecommunications
- Nanjing 210046
- China
| | - Ru-qiang Tian
- Key Laboratory for Organic Electronics and Information Displays (KLOEID)
- Institute of Advanced Materials (IAM)
- Nanjing University of Posts and Telecommunications
- Nanjing 210046
- China
| | - Min Yang
- Key Laboratory for Organic Electronics and Information Displays (KLOEID)
- Institute of Advanced Materials (IAM)
- Nanjing University of Posts and Telecommunications
- Nanjing 210046
- China
| | - Qing-fang Hua
- Key Laboratory for Organic Electronics and Information Displays (KLOEID)
- Institute of Advanced Materials (IAM)
- Nanjing University of Posts and Telecommunications
- Nanjing 210046
- China
| | - Yu-jie Shi
- Key Laboratory for Organic Electronics and Information Displays (KLOEID)
- Institute of Advanced Materials (IAM)
- Nanjing University of Posts and Telecommunications
- Nanjing 210046
- China
| | - Shang-hui Ye
- Key Laboratory for Organic Electronics and Information Displays (KLOEID)
- Institute of Advanced Materials (IAM)
- Nanjing University of Posts and Telecommunications
- Nanjing 210046
- China
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27
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Tian G, Jiang Y, Wu P, Huang J, Zou Q, Wang Q, Mu H, Su J. Pure hydrocarbon host materials based on spirofluorene with excellent performances for green phosphorescent light-emitting devices. NEW J CHEM 2016. [DOI: 10.1039/c6nj01872f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Four novel pure hydrocarbon spirofluorene-based compounds were fully investigated for green electrophosphorescent devices.
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Affiliation(s)
- Guojian Tian
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- P. R. China
| | - Yongxin Jiang
- Department of Physics
- School of Science
- East China University of Science and Technology
- Shanghai 200237
- P. R. China
| | - Panpan Wu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- P. R. China
| | - Jinhai Huang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- P. R. China
| | - Qi Zou
- Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power
- Shanghai University of Electric Power
- Shanghai 200090
- P. R. China
| | - Qiaochun Wang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- P. R. China
| | - Haichuan Mu
- Department of Physics
- School of Science
- East China University of Science and Technology
- Shanghai 200237
- P. R. China
| | - Jianhua Su
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- P. R. China
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28
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Synthesis of symmetrical and unsymmetrical 1,3-diheteroarylbenzenes through palladium-catalyzed direct arylation of benzene-1,3-disulfonyl dichloride and 3-bromobenzenesulfonyl chlorides. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.10.082] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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29
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Ban X, Sun K, Sun Y, Huang B, Ye S, Yang M, Jiang W. High Power Efficiency Solution-Processed Blue Phosphorescent Organic Light-Emitting Diodes Using Exciplex-Type Host with a Turn-on Voltage Approaching the Theoretical Limit. ACS APPLIED MATERIALS & INTERFACES 2015; 7:25129-25138. [PMID: 26502064 DOI: 10.1021/acsami.5b06424] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Three solution-processable exciplex-type host materials were successfully designed and characterized by equal molar blending hole transporting molecules with a newly synthesized electron transporting material, which possesses high thermal stability and good film-forming ability through a spin-coating technique. The excited-state dynamics and the structure-property relationships were systematically investigated. By gradually deepening the highest occupied molecular orbital (HOMO) level of electron-donating components, the triplet energy of exciplex hosts were increased from 2.64 to 3.10 eV. Low temperature phosphorescence spectra demonstrated that the excessively high triplet energy of exciplex would induce a serious energy leakage from the complex state to the constituting molecule. Furthermore, the low energy electromer state, which only exists under the electroexcitation, was found as another possible channel for energy loss in exciplex-based phosphorescent organic light-emitting diodes (OLEDs). In particular, as quenching of the exciplex-state and the triplet exciton were largely eliminated, solution-processed blue phosphorescence OLEDs using the exciplex-type host achieved an extremely low turn-on voltage of 2.7 eV and record-high power efficiency of 22.5 lm W(-1), which were among the highest values in the devices with identical structure.
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Affiliation(s)
- Xinxin Ban
- School of Chemistry and Chemical Engineering, Southeast University , Nanjing, Jiangsu, P. R. China , 211189
| | - Kaiyong Sun
- School of Chemistry and Chemical Engineering, Southeast University , Nanjing, Jiangsu, P. R. China , 211189
| | - Yueming Sun
- School of Chemistry and Chemical Engineering, Southeast University , Nanjing, Jiangsu, P. R. China , 211189
| | - Bin Huang
- School of Chemistry and Chemical Engineering, Southeast University , Nanjing, Jiangsu, P. R. China , 211189
| | - Shanghui Ye
- National Synergistic Innovation Center for Advanced Materials, Nanjing University of Posts and Telecommunications , Nanjing, Jiangsu, P. R. China , 210023
| | - Min Yang
- National Synergistic Innovation Center for Advanced Materials, Nanjing University of Posts and Telecommunications , Nanjing, Jiangsu, P. R. China , 210023
| | - Wei Jiang
- School of Chemistry and Chemical Engineering, Southeast University , Nanjing, Jiangsu, P. R. China , 211189
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30
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Bodedla GB, Justin Thomas KR, Kumar S, Jou JH, Li CJ. Phenothiazine-based bipolar green-emitters containing benzimidazole units: synthesis, photophysical and electroluminescence properties. RSC Adv 2015. [DOI: 10.1039/c5ra18372c] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
A series of bipolar green emitters bearing hole-transporting phenothiazine and electron-transporting N-phenylbenzimidazole are synthesized and characterized by their photophysical, electrochemical and thermal properties.
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Affiliation(s)
- Govardhana Babu Bodedla
- Organic Materials Chemistry
- Department of Chemistry
- Indian Institute of Technology Roorkee
- Roorkee 247667
- India
| | - K. R. Justin Thomas
- Organic Materials Chemistry
- Department of Chemistry
- Indian Institute of Technology Roorkee
- Roorkee 247667
- India
| | - Sandeep Kumar
- Organic Materials Chemistry
- Department of Chemistry
- Indian Institute of Technology Roorkee
- Roorkee 247667
- India
| | - Jwo-Huei Jou
- Department of Material Science and Engineering
- National Tsing Hua University
- Hsinchu 30013
- Taiwan
| | - Chieh-Ju Li
- Department of Material Science and Engineering
- National Tsing Hua University
- Hsinchu 30013
- Taiwan
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31
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Padalkar VS, Sakamaki D, Tohnai N, Akutagawa T, Sakai KI, Seki S. Highly emissive excited-state intramolecular proton transfer (ESIPT) inspired 2-(2′-hydroxy)benzothiazole–fluorene motifs: spectroscopic and photophysical properties investigation. RSC Adv 2015. [DOI: 10.1039/c5ra17980g] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Efficient solid state emission of fluorene–benzothiazole motifs via ESIPT process have been discussed experimentally and theoretically.
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Affiliation(s)
- Vikas S. Padalkar
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto
- Japan
| | - Daisuke Sakamaki
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto
- Japan
| | - Norimitsu Tohnai
- Department of Material and Life Science
- Graduate School of Engineering
- Osaka University
- Suita
- Japan
| | - Tomoyuki Akutagawa
- Institute of Multidisciplinary Research for Advanced Materials
- Tohoku University
- Sendai
- Japan
| | - Ken-ichi Sakai
- Department of Bio- & Material Photonics
- Chitose Institute of Science and Technology
- Chitose 066-8655
- Japan
| | - Shu Seki
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto
- Japan
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