1
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Hsieh CM, Wu TL, Jayakumar J, Wang YC, Ko CL, Hung WY, Lin TC, Wu HH, Lin KH, Lin CH, Hsieh S, Cheng CH. Diboron-Based Delayed Fluorescent Emitters with Orange-to-Red Emission and Superior Organic Light-Emitting Diode Efficiency. ACS APPLIED MATERIALS & INTERFACES 2020; 12:23199-23206. [PMID: 32326694 DOI: 10.1021/acsami.0c03711] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
For the application of organic light-emitting diodes (OLEDs) in lighting and panels, the basic requirement is to include a full spectrum color range. Compared with the development of blue and green luminophores in thermally activated delayed fluorescence (TADF) technology, the progress of orange-to-red materials is slow and needs further investigation. In this study, three diboron compound-based materials, dPhADBA, dmAcDBA, and SpAcDBA, were designed and synthesized by nucleophilic arylation of three amine donors on 9,10-diboraanthracene (DBA) in a two-step reaction. With increasing electron-donating ability, they show orange-to-red emission with TADF characteristics. The electroluminescence of these diboron compounds exhibits emissions λmax at 613, 583, and 567 nm for dPhADBA, dmAcDBA, and SpAcDBA, respectively. It is noteworthy that the rod-like D-A-D structures can achieve high horizontal ratios (84-86%) and outstanding device performance for orange-to-red TADF OLEDs: the highest external quantum efficiencies for dPhADBA, dmAcDBA, and SpAcDBA are 11.1 ± 0.5, 24.9 ± 0.5, and 30.0 ± 0.8%, respectively. Therefore, these diboron-based molecules offer a promising avenue for the design of orange-to-red TADF emitters and the development of highly efficient orange-to-red OLEDs.
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Affiliation(s)
- Chia-Min Hsieh
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Tien-Lin Wu
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | | | - Ying-Chun Wang
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Chang-Lun Ko
- Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung 20224, Taiwan
| | - Wen-Yi Hung
- Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung 20224, Taiwan
| | | | - Hsin-Hui Wu
- AU Optronics Corporation, Hsinchu 30078, Taiwan
| | | | | | - Shuchen Hsieh
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
- Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan
| | - Chien-Hong Cheng
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
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2
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Song W, Xu Q, Zhu J, Chen Y, Mu H, Huang J, Su J. Imidazo[1,2- b]pyridazine as Building Blocks for Host Materials for High-Performance Red-Phosphorescent Organic Light-Emitting Devices. ACS APPLIED MATERIALS & INTERFACES 2020; 12:19701-19709. [PMID: 32267666 DOI: 10.1021/acsami.9b22060] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A novel electron-transporting unit, imidazo [1,2-b]pyridazine (IP), was first reported for developing host materials. The IP moiety possesses excellent electron-transporting ability and great thermal stability. Using carbazole as p-type units and IP as n-type units, several bipolar host materials, namely, IP6Cz, IP68Cz, IP36Cz, and IP368Cz, were developed through altering the substitution site of the IP core. Among these four materials, 6-site-substituted IP6Cz and 6,8-site-substituted IP68Cz exhibit the best electroluminescence (EL) performance. IP6Cz- and IP68Cz-based red phosphorescent organic light-emitting diodes using Ir(pq)2acac as the emitter exhibit extremely high EL efficiency with the maximum external quantum efficiency (ηext,max) of 26.9 and 25.2% and an insignificant efficiency roll-off. Moreover, IP6Cz- and IP68Cz-based deep-red devices doped by Ir(piq)2acac also show satisfactory EL performance with a ηext,max of 20.5 and 19.9%, respectively. The influence of different substitution sites of the IP core on the photophysical and electrochemical properties was systematically investigated. This study demonstrates that IP could be a first-rate electron-transporting unit for bipolar materials for red-emitting devices.
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Affiliation(s)
- Wenxuan Song
- Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center, Institute of Fine Chemicals, School of Chemistry & Molecular Engineering, East China University of Science & Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Qihao Xu
- Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center, Institute of Fine Chemicals, School of Chemistry & Molecular Engineering, East China University of Science & Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Jiangnan Zhu
- Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center, Institute of Fine Chemicals, School of Chemistry & Molecular Engineering, East China University of Science & Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Yi Chen
- Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center, Institute of Fine Chemicals, School of Chemistry & Molecular Engineering, East China University of Science & Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Haichuan Mu
- Department of Physics, School of Science, East China University of Science & Technology, Shanghai 200237, PR China
| | - Jinhai Huang
- Shanghai Taoe Chemical Technology Company, Ltd., Shanghai 200030, PR China
| | - Jianhua Su
- Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center, Institute of Fine Chemicals, School of Chemistry & Molecular Engineering, East China University of Science & Technology, 130 Meilong Road, Shanghai 200237, P. R. China
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3
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Liu XY, Zhang YJ, Fei X, Fung MK, Fan J. Four-Coordinate Organoboron Platforms for Efficient Red Phosphorescent Organic Light-Emitting Diodes. Chempluschem 2020; 84:1587-1595. [PMID: 31943932 DOI: 10.1002/cplu.201900406] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 08/16/2019] [Indexed: 11/11/2022]
Abstract
So far both three- and four-coordinate organoboron compounds have been widely applied in organic light-emitting diode (OLED) materials. However, the use of four-coordinate organoboron compounds as host materials is rarely reported. In this work, two new four-coordinate organoboron compounds, namely 8-(4-(9H-carbazol-9-yl)phenyl)-6,6-difluoro-6H-6λ4 ,7λ4 -benzo[4',5']imidazo[1',2':3,4][1,3,2]diazaborolo[1,5-a]pyridine (B1PCz) and 8-(3-(9H-carbazol-9-yl)phenyl)-6,6-difluoro-6H-6λ4 ,7λ4 -benzo[4',5']imidazo[1',2':3,4][1,3,2]diazaborolo[1,5-a]pyridine (B1MCz), were successfully designed, synthesized, and fully characterized. The red OLEDs using B1PCz and B1MCz as host materials achieved relatively high device performance with a maximum external quantum efficiency of 14.8 % and 11.8 %, respectively. These results will expand the scope of organoboron compounds for OLED materials and reveal the great potential of four-coordinate organoboron materials.
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Affiliation(s)
- Xiang-Yang Liu
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu, 215123, P. R. China.,Suzhou Ever Display Advanced Materials Co., Ltd. Wujiang, Suzhou, Jiangsu, 215000, P. R. China
| | - Yi-Jie Zhang
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu, 215123, P. R. China.,Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, Jiangsu, 215123, P. R. China
| | - Xiyu Fei
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu, 215123, P. R. China.,Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, Jiangsu, 215123, P. R. 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, P. R. China.,Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, Jiangsu, 215123, P. R. China
| | - Jian Fan
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu, 215123, P. R. China.,Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, Jiangsu, 215123, P. R. China
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Huo J, Wang H, Li S, Shi H, Tang Y, Tang BZ. Design and Development of Highly Efficient Light-Emitting Layers in OLEDs with Dimesitylboranes: An Updated Review. CHEM REC 2019; 20:556-569. [PMID: 31642593 DOI: 10.1002/tcr.201900068] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Indexed: 11/12/2022]
Abstract
With excellent luminescent properties and transport properties, triarylborane compounds containing two mesitylenes (Mes) have gained much attention for their application in OLEDs as light-emitting layers. This study serves as an updated review summarizing recent developments in the design of fluorescent chromophores and phosphorescent host materials for OLEDs comprising small molecular compounds of dimesitylborane (BMes2 ) as luminescent layers, with attention to the performance of different light-emitting devices. Problems that need to be solved in the research and application of BMes2 in OLEDs are presented and the application prospects of such materials are suggested.
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Affiliation(s)
- Jinnan Huo
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, 030006, China
| | - Hongbo Wang
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, 030006, China
| | - Shuhui Li
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, 030006, China
| | - Heping Shi
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, 030006, China
| | - Youhong Tang
- Institute for NanoScale Science and Technology, Medical Device Research Institute, College of Science and Engineering, Flinders University, South Australia, 5042, Australia
| | - Ben Zhong Tang
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction and Institute for Advanced Study, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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5
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Dou D, Wu P, Liao Z, Hao J, Zhang J, Wang Z. A thermally activated delayed fluorescence exciplex to achieve highly efficient and stable blue and green phosphorescent organic light-emitting diodes. RSC Adv 2019; 9:23810-23817. [PMID: 35530600 PMCID: PMC9069484 DOI: 10.1039/c9ra02875g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Accepted: 06/22/2019] [Indexed: 12/26/2022] Open
Abstract
The development of a thermally activated delayed fluorescence (TADF) exciplex with high energy is of great significance in achieving highly efficient blue, green, and red organic light-emitting diodes (OLEDs) for use in full-color displays and white lighting. Highly efficient and stable blue and green phosphorescent OLEDs were demonstrated by employing a TADF exciplex (energy: 2.9 eV) based on 4-substituted aza-9,9'-spirobifluorenes (aza-SBFs). Blue PhOLEDs demonstrated a maximum current efficiency (CE) of 47.9 cd A-1 and an external quantum efficiency (EQE) of 22.5% at 1300 cd m-2 (2.5 times the values of aza-SBF-based systems), with the best blue PhOLED demonstrating a CE, power efficiency (PE) and EQE of 60.3 cd A-1, 52.7 lm W-1, and 26.2%, respectively. Green PhOLEDs exhibited a CE of 78.1 cd A-1 and EQE of 22.5% at 9360 cd m-2, with the best green PhOLED exhibiting a maximum CE, PE, and EQE of 87.4 cd A-1, 101.6 lm W-1, and 24.5%, respectively. The device operational lifetime was improved over 17-fold compared to reference devices because of the high thermal stability of the materials and full utilization of the TADF exciplex energy, indicating their potential for application in commercial OLEDs.
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Affiliation(s)
- Dehai Dou
- Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University 149 Yanchang Rd 200072 P. R. China +86-21-56333362 +86-21-56333362
- Department of Chemistry, Shanghai University 149 Yanchang Rd 200072 P. R. China
| | - Peng Wu
- Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University 149 Yanchang Rd 200072 P. R. China +86-21-56333362 +86-21-56333362
- Department of Chemistry, Shanghai University 149 Yanchang Rd 200072 P. R. China
| | - Zhangcheng Liao
- Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University 149 Yanchang Rd 200072 P. R. China +86-21-56333362 +86-21-56333362
- Department of Chemistry, Shanghai University 149 Yanchang Rd 200072 P. R. China
| | - Jian Hao
- Department of Chemistry, Shanghai University 149 Yanchang Rd 200072 P. R. China
| | - Jianhua Zhang
- Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University 149 Yanchang Rd 200072 P. R. China +86-21-56333362 +86-21-56333362
| | - Zixing Wang
- Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University 149 Yanchang Rd 200072 P. R. China +86-21-56333362 +86-21-56333362
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6
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Liu X, Zhang Y, Fei X, Fung M, Fan J. Dispirocycles: Platforms for the Construction of High‐Performance Host Materials for Phosphorescent Organic Light‐Emitting Diodes. Chemistry 2019; 25:6788-6796. [DOI: 10.1002/chem.201806207] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 03/05/2019] [Indexed: 02/04/2023]
Affiliation(s)
- Xiang‐Yang Liu
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Joint International Research Laboratory of, Carbon-Based Functional Materials and Devices, Institute of Functional Nano & Soft Materials (FUNSOM)Soochow University Suzhou Jiangsu 215123 P. R. China
| | - Yi‐Jie Zhang
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Joint International Research Laboratory of, Carbon-Based Functional Materials and Devices, Institute of Functional Nano & Soft Materials (FUNSOM)Soochow University Suzhou Jiangsu 215123 P. R. China
| | - Xiyu Fei
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Joint International Research Laboratory of, Carbon-Based Functional Materials and Devices, Institute of Functional Nano & Soft Materials (FUNSOM)Soochow University Suzhou Jiangsu 215123 P. R. China
| | - Man‐Keung Fung
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Joint International Research Laboratory of, Carbon-Based Functional Materials and Devices, Institute of Functional Nano & Soft Materials (FUNSOM)Soochow University Suzhou Jiangsu 215123 P. R. China
| | - Jian Fan
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Joint International Research Laboratory of, Carbon-Based Functional Materials and Devices, Institute of Functional Nano & Soft Materials (FUNSOM)Soochow University Suzhou Jiangsu 215123 P. R. China
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7
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Wu TL, Lo SH, Chang YC, Huang MJ, Cheng CH. Steric Switching for Thermally Activated Delayed Fluorescence by Controlling the Dihedral Angles between Donor and Acceptor in Organoboron Emitters. ACS APPLIED MATERIALS & INTERFACES 2019; 11:10768-10776. [PMID: 30777421 DOI: 10.1021/acsami.8b21568] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Five emitters CzAZB, tBuCzAZB, tmCzAZB, dmAcAZB, and PxzAZB based on dibenzo-1,4-azaborine as the electron acceptors and two identical amine groups as the donors were designed and synthesized. The dihedral angles between the planes of dibenzo-1,4-azaborine acceptors and amine-based donors greatly affect the thermally activated delayed fluorescence (TADF) property of these materials. A simple concept "steric switching" is introduced to predict whether the emitter possesses TADF property. CzAZB and tBuCzAZB, with very high photoluminescence quantum yields (PLQYs) but small dihedral angles, do not show TADF. In contrast, tmCzAZB reveals a PLQY of only 56% but with a large dihedral angle due to the presence of two methyl groups at C1 and C8 of the carbazole groups, the steric switching operates, and the compound shows TADF property with a deep-blue color having CIE coordinates of (0.14, 0.15). In a similar manner, in dmAcAZB and PxzAZB with high PLQYs and large dihedral angles between the donor and acceptor planes, the "TADF steric switch" readily operates to achieve device external quantum efficiencies as high as 20.8 ± 1.2 and 27.5 ± 1.9% with blue and green emissions, respectively.
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Affiliation(s)
- Tien-Lin Wu
- Department of Chemistry , National Tsing Hua University , No. 101, Section 2, Kuang-Fu Road , Hsinchu 30013 , Taiwan
| | - Shih-Han Lo
- Department of Chemistry , National Tsing Hua University , No. 101, Section 2, Kuang-Fu Road , Hsinchu 30013 , Taiwan
| | - Yu-Che Chang
- Department of Chemistry , National Tsing Hua University , No. 101, Section 2, Kuang-Fu Road , Hsinchu 30013 , Taiwan
| | - Min-Jie Huang
- Department of Chemistry , National Tsing Hua University , No. 101, Section 2, Kuang-Fu Road , Hsinchu 30013 , Taiwan
| | - Chien-Hong Cheng
- Department of Chemistry , National Tsing Hua University , No. 101, Section 2, Kuang-Fu Road , Hsinchu 30013 , Taiwan
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Sicard LJ, Li H, Wang Q, Liu X, Jeannin O, Rault‐Berthelot J, Liao L, Jiang Z, Poriel C. C1‐Linked Spirobifluorene Dimers: Pure Hydrocarbon Hosts for High‐Performance Blue Phosphorescent OLEDs. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201813604] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | - Hong‐Cheng Li
- Institute of Functional Nano & Soft MaterialsSoochow University Suzhou 215123 P. R. China
| | - Qiang Wang
- Institute of Functional Nano & Soft MaterialsSoochow University Suzhou 215123 P. R. China
| | - Xiang‐Yang Liu
- Institute of Functional Nano & Soft MaterialsSoochow University Suzhou 215123 P. R. China
| | | | | | - Liang‐Sheng Liao
- Institute of Functional Nano & Soft MaterialsSoochow University Suzhou 215123 P. R. China
| | - Zuo‐Quan Jiang
- Institute of Functional Nano & Soft MaterialsSoochow University Suzhou 215123 P. R. China
| | - Cyril Poriel
- Univ RennesCNRS, ISCR- UMR 6226 35000 Rennes France
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9
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Sicard LJ, Li HC, Wang Q, Liu XY, Jeannin O, Rault-Berthelot J, Liao LS, Jiang ZQ, Poriel C. C1-Linked Spirobifluorene Dimers: Pure Hydrocarbon Hosts for High-Performance Blue Phosphorescent OLEDs. Angew Chem Int Ed Engl 2019; 58:3848-3853. [PMID: 30762276 DOI: 10.1002/anie.201813604] [Citation(s) in RCA: 79] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Indexed: 11/07/2022]
Abstract
Reported here are C1-linked spiro-bifluorene dimers. A comprehensive study is carried out to analyze the electronic properties of these highly twisted structures. This work shows that the C1-position enables the design of pure hydrocarbon materials, with a high triplet energy, for hosting blue phosphors in efficient phosphorescent OLEDs (PhOLEDs). To date, this work describes the highest performance of blue PhOLEDs ever reported for pure hydrocarbons (external quantum efficiency of ca. 23 %), thus highlighting the potential of the C1-spirobifluorene scaffold in organic electronics.
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Affiliation(s)
| | - Hong-Cheng Li
- Institute of Functional Nano & Soft Materials, Soochow University, Suzhou, 215123, P. R. China
| | - Qiang Wang
- Institute of Functional Nano & Soft Materials, Soochow University, Suzhou, 215123, P. R. China
| | - Xiang-Yang Liu
- Institute of Functional Nano & Soft Materials, Soochow University, Suzhou, 215123, P. R. China
| | | | | | - Liang-Sheng Liao
- Institute of Functional Nano & Soft Materials, Soochow University, Suzhou, 215123, P. R. China
| | - Zuo-Quan Jiang
- Institute of Functional Nano & Soft Materials, Soochow University, Suzhou, 215123, P. R. China
| | - Cyril Poriel
- Univ Rennes, CNRS, ISCR- UMR 6226, 35000, Rennes, France
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Jayabharathi J, Thanikachalam V, Ramya R, Panimozhi S. Strategic tuning of excited-state properties of electroluminescent materials with enhanced hot exciton mixing. RSC Adv 2019; 9:33693-33709. [PMID: 35528924 PMCID: PMC9073535 DOI: 10.1039/c9ra07509g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Accepted: 10/14/2019] [Indexed: 12/30/2022] Open
Abstract
Deep blue emitters with excellent stability, high quantum yield and multifunctionality are the major issues for full-color displays. In line with this, new multifunctional, thermally stable blue emitters viz., N-(4-(10-(1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)-1H-phenanthro[9,10-d]imidazol-2-yl)anthracen-9-yl)phenyl)-N-phenylbenzenamine (DPIAPPB) and 2-(10-(9H-carbazol-9-yl)anthracen-9-yl)-1-(2,3-dihydrobenzo[b][1,4]dioxin-6-yl)-1H-phenanthro[9,10-d]imidazole (CADPPI) with hybridized local charge transfer state (HLCT) and hot exciton properties have been synthesized. These molecules show high photoluminescence quantum yield (Φs/f): (DPIAPPB – 0.82/0.70 and CADPPI – 0.91/0.83). The CADPPI based device (EL – 467 nm) shows high efficiencies [ηc – 9.85 cd A−1; ηp – 10.84 lm W−1; ηex – 4.78% at 2.8 V; CIE (0.15, 0.10)] compared to the DPIAPPB device (EL − 472 nm) [ηc – 6.56 cd A−1; ηp – 6.16 lm W−1; ηex – 4.15% at 2.8 V with CIE (0.15, 0.12)]. The green device with CADPPI:Ir(ppy)3 exhibits a maximum L – 59 012 cd m−2; ηex – 16.8%; ηc – 37.3 cd A−1; ηp – 39.8 lm W−1 with CIE (0.30, 0.60) and the red device with CADPPI:Ir(MDQ)2(acac) shows a maximum L – 43 456 cd m−2; ηex – 21.9%; ηc – 36.0 cd A−1; ηp – 39.6 lm W−1 with CIE (0.64, 0.35). The CADPPI:Ir(ppy)3 device exhibits L – 90 12 cd m−2; ηex – 18.8%; ηc − 27.3 cd A−1; ηp – 29.8 lm W−1; CIE (0.30, 0.60).![]()
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Jin J, Tao Y, Jiang H, Chen R, Xie G, Xue Q, Tao C, Jin L, Zheng C, Huang W. Star-Shaped Boron-Containing Asymmetric Host Materials for Solution-Processable Phosphorescent Organic Light-Emitting Diodes. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2018; 5:1800292. [PMID: 30128241 PMCID: PMC6096993 DOI: 10.1002/advs.201800292] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 04/22/2018] [Indexed: 05/29/2023]
Abstract
Boron-containing compounds have attracted considerable attention because of their electron-accepting properties, and they are widely used in a variety of fields. However, due to the essential requirement to protect the empty pz-orbital of the boron atom using large steric hindrance or rigid groups, borane derivatives generally show poor solubility and are rarely reported as acceptor units to construct bipolar host materials for phosphorescent organic light-emitting diodes (PhOLEDs). Here, a combined star-shaped and asymmetric donor-acceptor molecular design strategy to improve the solubility and fine tune the optical and electronic properties of boron-containing materials is presented. High thermal stability, solvent solubility, solution processability, and triplet energy are achieved simultaneously. With the thus-designed boron-containing bipolar molecules as host materials, the solution-processed PhOLEDs exhibit high device performances, which are comparable to the vacuum-processed counterparts, showing high external quantum efficiencies up to 18.5% and 14.5% in blue and white PhOLEDs, respectively. These results demonstrate the great potential of the star-shaped and symmetry-breaking borane derivatives in solution-processable organic optoelectronic devices.
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Affiliation(s)
- Jibiao Jin
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for BiosensorsInstitute of Advanced Materials (IAM)Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)Nanjing University of Posts & Telecommunications9 Wenyuan RoadNanjing210023China
| | - Ye Tao
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for BiosensorsInstitute of Advanced Materials (IAM)Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)Nanjing University of Posts & Telecommunications9 Wenyuan RoadNanjing210023China
| | - He Jiang
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for BiosensorsInstitute of Advanced Materials (IAM)Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)Nanjing University of Posts & Telecommunications9 Wenyuan RoadNanjing210023China
| | - Runfeng Chen
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for BiosensorsInstitute of Advanced Materials (IAM)Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)Nanjing University of Posts & Telecommunications9 Wenyuan RoadNanjing210023China
| | - Guohua Xie
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for BiosensorsInstitute of Advanced Materials (IAM)Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)Nanjing University of Posts & Telecommunications9 Wenyuan RoadNanjing210023China
- Hubei Collaborative Innovation Center for Advanced Organic Chemical MaterialsHubei Key Lab on Organic and Polymeric Optoelectronic MaterialsDepartment of ChemistryWuhan UniversityWuhan430072China
| | - Qin Xue
- Department of Physical Science and TechnologyCentral China Normal UniversityWuhan430079China
| | - Chen Tao
- School of Physics and TechnologyWuhan UniversityWuhan430072China
| | - Lu Jin
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for BiosensorsInstitute of Advanced Materials (IAM)Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)Nanjing University of Posts & Telecommunications9 Wenyuan RoadNanjing210023China
| | - Chao Zheng
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for BiosensorsInstitute of Advanced Materials (IAM)Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)Nanjing University of Posts & Telecommunications9 Wenyuan RoadNanjing210023China
| | - Wei Huang
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for BiosensorsInstitute of Advanced Materials (IAM)Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM)Nanjing University of Posts & Telecommunications9 Wenyuan RoadNanjing210023China
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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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Song W, Shi L, Gao L, Hu P, Mu H, Xia Z, Huang J, Su J. [1,2,4]Triazolo[1,5-a]pyridine as Building Blocks for Universal Host Materials for High-Performance Red, Green, Blue and White Phosphorescent Organic Light-Emitting Devices. ACS APPLIED MATERIALS & INTERFACES 2018; 10:5714-5722. [PMID: 29368499 DOI: 10.1021/acsami.7b18202] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The electron-accepting [1,2,4]triazolo[1,5-a]pyridine (TP) moiety was introduced to build bipolar host materials for the first time, and two host materials based on this TP acceptor and carbazole donor, namely, 9,9'-(2-([1,2,4]triazolo[1,5-a]pyridin-2-yl)-1,3-phenylene)bis(9H-carbazole) (o-CzTP) and 9,9'-(5-([1,2,4]triazolo[1,5-a]pyridin-2-yl)-1,3-phenylene)bis(9H-carbazole) (m-CzTP), were designed and synthesized. These two TP-based host materials possess a high triplet energy (>2.9 eV) and appropriate highest occupied molecular orbital/lowest unoccupied molecular orbital levels as well as the bipolar transporting feature, which permits their applicability as universal host materials in multicolor phosphorescent organic light-emitting devices (PhOLEDs). Blue, green, and red PhOLEDs based on o-CzTP and m-CzTP with the same device configuration all show high efficiencies and low efficiency roll-off. The devices hosted by o-CzTP exhibit maximum external quantum efficiencies (ηext) of 27.1, 25.0, and 15.8% for blue, green, and red light emitting, respectively, which are comparable with the best electroluminescene performance reported for FIrpic-based blue, Ir(ppy)3-based green, and Ir(pq)2(acac)-based red PhOLEDs equipped with a single-component host. The white PhOLEDs based on the o-CzTP host and three lumophors containing red, green, and blue emitting layers were fabricated with the same device structure, which exhibit a maximum current efficiency and ηc of 40.4 cd/A and 17.8%, respectively, with the color rendering index value of 75.
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Affiliation(s)
| | | | - Lei Gao
- School of Chemistry and Chemical Engineering, Queen's University , Belfast BT7 1NN, U.K
| | - Peijun Hu
- School of Chemistry and Chemical Engineering, Queen's University , Belfast BT7 1NN, U.K
| | | | - Zhenyuan Xia
- Shanghai Taoe Chemical Technology Co., Ltd , Shanghai 200030, PR China
| | - Jinhai Huang
- Shanghai Taoe Chemical Technology Co., Ltd , Shanghai 200030, PR China
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Synthesis and Electroluminescence Properties of 3-(Trifluoromethyl)phenyl-Substituted 9,10-Diarylanthracene Derivatives for Blue Organic Light-Emitting Diodes. APPLIED SCIENCES-BASEL 2017. [DOI: 10.3390/app7111109] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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15
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An optical and electrical study of full thermally activated delayed fluorescent white organic light-emitting diodes. Sci Rep 2017; 7:6234. [PMID: 28740185 PMCID: PMC5524785 DOI: 10.1038/s41598-017-06568-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Accepted: 06/14/2017] [Indexed: 11/20/2022] Open
Abstract
We report on the engineering of full thermally activated delayed fluorescence – based white organic light emitting diodes (W-OLEDs) composed of three emitters (2,7-bis(9,9-dimethyl-acridin-10-yl)-9,9-dimethylthioxanthene-S,S-dioxide (DDMA-TXO2), 2,7-bis(phenoxazin-10-yl)-9,9-dimethylthioxanthene-S,S-dioxide (DPO-TXO2) and 3,11-di(10H-phenoxazin-10-yl)dibenzo[a,j]phenazine (POZ-DBPHZ) in two different hosts. By controlling the device design through the study of the emission of DDMA-TXO2 and DPO-TXO2, the behaviour of POZ-DBPHZ in a device with more than one emitter, and the combination of the three materials, respectively, we show that external quantum efficiencies as high as 16% can be obtained for a structure with a correlated colour temperature close to warm white, together with colour rendering index close to 80. However it is in their performance stability that provides the true breakthrough: at 1000 cd/m2 the efficiencies were still above 10%, which is one of the best for this type of devices.
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Quinton C, Thiery S, Jeannin O, Tondelier D, Geffroy B, Jacques E, Rault-Berthelot J, Poriel C. Electron-Rich 4-Substituted Spirobifluorenes: Toward a New Family of High Triplet Energy Host Materials for High-Efficiency Green and Sky Blue Phosphorescent OLEDs. ACS APPLIED MATERIALS & INTERFACES 2017; 9:6194-6206. [PMID: 28111937 DOI: 10.1021/acsami.6b14285] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report herein a detailed structure-properties relationship study of the first examples of electron-rich 4-substituted spirobifluorenes for organic electronic applications, namely, 4-phenyl-N-carbazole-spirobifluorene (4-PhCz-SBF) and 4-(3,4,5-trimethoxyphenyl)-spirobifluorene (4-Ph(OMe)3-SBF). The incorporation of the electron-rich moieties in the ortho position of the biphenyl linkage (position C4) induces unique properties, very different from those previously described in the literature for this family of semiconductors. Both dyes can be readily synthesized, possess high triplet energies and excellent thermal stability, and their HOMO energy levels are highly increased compared to those of other 4-substituted SBFs. We also provide in this work the first rationalization of the peculiar fluorescence of 4-substituted SBFs. Finally, the present dyes have been successfully incorporated as host in green and blue phosphorescent organic light-emitting diodes with high performance either for the green (EQE of 20.2%) or the blue color (EQE of 9.6%). These performances are, to the best of our knowledge, among the highest reported to date for 4-substituted SBF derivatives.
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Affiliation(s)
- Cassandre Quinton
- Institut des Sciences Chimiques de Rennes - UMR CNRS 6226, Université Rennes 1 , 35042 Rennes, France
| | - Sébastien Thiery
- Institut des Sciences Chimiques de Rennes - UMR CNRS 6226, Université Rennes 1 , 35042 Rennes, France
| | - Olivier Jeannin
- Institut des Sciences Chimiques de Rennes - UMR CNRS 6226, Université Rennes 1 , 35042 Rennes, France
| | - Denis Tondelier
- LPICM, CNRS, Ecole Polytechnique, Université Paris Saclay , 91128 Palaiseau, France
| | - Bernard Geffroy
- LPICM, CNRS, Ecole Polytechnique, Université Paris Saclay , 91128 Palaiseau, France
- LICSEN, NIMBE, CEA, CNRS, Université Paris-Saclay, CEA Saclay , Gif-sur-Yvette CEDEX 91191, France
| | - Emmanuel Jacques
- UMR CNRS 6164-Institut d'Électronique et des Télécommunications de Rennes- Département Microélectronique & Microcapteurs, Bât. 11B, Université Rennes 1 , Campus de Beaulieu, Rennes CEDEX 35042, France
| | - Joëlle Rault-Berthelot
- Institut des Sciences Chimiques de Rennes - UMR CNRS 6226, Université Rennes 1 , 35042 Rennes, France
| | - Cyril Poriel
- Institut des Sciences Chimiques de Rennes - UMR CNRS 6226, Université Rennes 1 , 35042 Rennes, France
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Xu T, Zhang YX, Wang B, Huang CC, Murtaza I, Meng H, Liao LS. Highly Simplified Reddish Orange Phosphorescent Organic Light-Emitting Diodes Incorporating a Novel Carrier- and Exciton-Confining Spiro-Exciplex-Forming Host for Reduced Efficiency Roll-off. ACS APPLIED MATERIALS & INTERFACES 2017; 9:2701-2710. [PMID: 28034314 DOI: 10.1021/acsami.6b13077] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A novel exciplex-forming host is applied so as to design highly simplified reddish orange light-emitting diodes (OLEDs) with low driving voltage, high efficiency, and an extraordinarily low efficiency roll-off, by combining N,N-10-triphenyl-10H-spiro [acridine-9,9'-fluoren]-3'-amine (SAFDPA) with 4,7-diphenyl-1,10-phenanthroline (Bphen) doped with trivalent iridium complex bis(2-methyldibenzo[f,h]quinoxaline) (acetylacetonate)iridium(III) (Ir(MDQ)2(acac)). The reddish orange OLEDs achieve a strikingly high power efficiency (PE) of 31.80 lm/W with an ultralow threshold voltage of 2.24 V which is almost equal to the triplet energy level of the phosphorescent reddish orange emitting dopant. The power efficiency of the device with the exciplex-forming host is enhanced, achieving 36.2% mainly owing to the lower operating voltage by the novel exciplex forming cohost, compared with the reference device (23.54 lm/W). Moreover, the OLEDs show extraordinarily low current efficiency (CE) roll-off to 1.41% at the brightness from 500 to 5000 cd/m2 with a maximal CE of 32.87 cd/A (EQEmax = 11.01%). The devices display a good reddish orange color (CIE of (0.628, 0.372) at 500 cd/m2) nearly without color shift with increasing brightness. Co-host architecture phosphorescent OLEDs show a simpler device structure, lower working voltage, and a better efficiency and stability than those of the reference devices without the cohost architecture, which helps to simplify the OLED structure, lower the cost, and popularize OLED technology.
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Affiliation(s)
- Ting Xu
- School of Advanced Materials, Peking University Shenzhen Graduate School, Peking University , Shenzhen 518055, China
| | - Ye-Xin Zhang
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou, Jiangsu 215123, China
| | - Bo Wang
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou, Jiangsu 215123, China
| | - Chen-Chao Huang
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou, Jiangsu 215123, China
| | - Imran Murtaza
- Key Laboratory of Flexible Electronics and Institute of Advanced Materials, Jiangsu National Synergistic Innovation Centre for Advanced Materials, Nanjing Tech University , Nanjing 211816, China
- Department of Physics, International Islamic University , Islamabad 44000, Pakistan
| | - Hong Meng
- School of Advanced Materials, Peking University Shenzhen Graduate School, Peking University , Shenzhen 518055, China
- Key Laboratory of Flexible Electronics and Institute of Advanced Materials, Jiangsu National Synergistic Innovation Centre for Advanced Materials, Nanjing Tech University , Nanjing 211816, 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
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