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Park D, Kang S, Ryoo CH, Jhun BH, Jung S, Le TN, Suh MC, Lee J, Jun ME, Chu C, Park J, Park SY. High-performance blue OLED using multiresonance thermally activated delayed fluorescence host materials containing silicon atoms. Nat Commun 2023; 14:5589. [PMID: 37696833 PMCID: PMC10495399 DOI: 10.1038/s41467-023-41440-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Accepted: 08/29/2023] [Indexed: 09/13/2023] Open
Abstract
We report three highly efficient multiresonance thermally activated delayed fluorescence blue-emitter host materials that include 5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene (DOBNA) and tetraphenylsilyl groups. The host materials doped with the conventional N7,N7,N13,N13,5,9,11,15-octaphenyl-5,9,11,15-tetrahydro-5,9,11,15-tetraaza-19b,20b-diboradinaphtho[3,2,1-de:1',2',3'-jk]pentacene-7,13-diamine (ν-DABNA) blue emitter exhibit a high photoluminescence quantum yield greater than 0.82, a high horizontal orientation greater than 88%, and a short photoluminescence decay time of 0.96-1.93 μs. Among devices fabricated using six synthesized compounds, the device with (4-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)phenyl)triphenylsilane (TDBA-Si) shows high external quantum efficiency values of 36.2/35.0/31.3% at maximum luminance/500 cd m-2/1,000 cd m-2. This high performance is attributed to fast energy transfer from the host to the dopant. Other factors possibly contributing to the high performance are a T1 excited-state contribution, inhibition of aggregation by the bulky tetraphenylsilyl groups, high horizontal orientation, and high thermal stability. We achieve a high efficiency greater than 30% and a small roll-off value of 4.9% at 1,000 cd m-2 using the TDBA-Si host material.
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Affiliation(s)
- Dongmin Park
- Center for Supramolecular Optoelectronic Materials (CSOM), Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Seokwoo Kang
- Integrated Engineering, Department of Chemical Engineering, Kyung Hee University, Gyeonggi, 17104, Republic of Korea
| | - Chi Hyun Ryoo
- Center for Supramolecular Optoelectronic Materials (CSOM), Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Byung Hak Jhun
- Center for Supramolecular Optoelectronic Materials (CSOM), Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Seyoung Jung
- Center for Supramolecular Optoelectronic Materials (CSOM), Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Thi Na Le
- Department of Information Display, Kyung Hee University, Dongdaemoon-Gu, Seoul, 02447, Republic of Korea
| | - Min Chul Suh
- Department of Information Display, Kyung Hee University, Dongdaemoon-Gu, Seoul, 02447, Republic of Korea
| | - Jaehyun Lee
- Advanced Chemical Materials R&D Team, Korea Testing & Research Institute, Gwangyang, 57765, Republic of Korea
| | - Mi Eun Jun
- Samsung Display, 1 Samsung-ro Giheung-Gu, Yongin, 17113, Republic of Korea
| | - Changwoong Chu
- Samsung Display, 1 Samsung-ro Giheung-Gu, Yongin, 17113, Republic of Korea
| | - Jongwook Park
- Integrated Engineering, Department of Chemical Engineering, Kyung Hee University, Gyeonggi, 17104, Republic of Korea.
| | - Soo Young Park
- Center for Supramolecular Optoelectronic Materials (CSOM), Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea.
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Pashaei B, Karimi S, Shahroosvand H, Abbasi P, Pilkington M, Bartolotta A, Fresta E, Fernandez-Cestau J, Costa RD, Bonaccorso F. Polypyridyl ligands as a versatile platform for solid-state light-emitting devices. Chem Soc Rev 2019; 48:5033-5139. [DOI: 10.1039/c8cs00075a] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A comprehensive review of tuneable polypyridine complexes as the emissive components of OLED and LEC devices is presented, with a view to bridging the gap between molecular design and commercialization.
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Affiliation(s)
- Babak Pashaei
- Group for Molecular Engineering of Advanced Functional Materials (GMA)
- Department of Chemistry
- University of Zanjan
- Zanjan
- Iran
| | - Soheila Karimi
- Group for Molecular Engineering of Advanced Functional Materials (GMA)
- Department of Chemistry
- University of Zanjan
- Zanjan
- Iran
| | - Hashem Shahroosvand
- Group for Molecular Engineering of Advanced Functional Materials (GMA)
- Department of Chemistry
- University of Zanjan
- Zanjan
- Iran
| | - Parisa Abbasi
- Department of Chemistry
- Brock University
- St. Catharines
- Canada
| | | | | | - Elisa Fresta
- IMDEA Materials Institute
- Madrid
- Spain
- Universidad Autónoma de Madrid
- Departamento de Física Aplicada
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Whang DR, Apaydin DH, Park SY, Sariciftci NS. An electron-reservoir Re(I) complex for enhanced efficiency for reduction of CO2 to CO. J Catal 2018. [DOI: 10.1016/j.jcat.2018.04.028] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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4
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Li X, Bai Q, Li J, Lu F, Sun X, Lu P. Synthesis and properties of wide bandgap polymers based on tetraphenylsilane and their applications as hosts in electrophosphorescent devices. NEW J CHEM 2018. [DOI: 10.1039/c7nj04213b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
By introducing the electron-withdrawing diphenylphosphine oxide in PFSCPO, its doped OLEDs achieve enhanced current and external quantum efficiencies than the PFSC-hosted device.
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Affiliation(s)
- Xiaoxiao Li
- State Key Laboratory of Supramolecular Structure and Materials
- Jilin University
- Qianjin Avenue
- Changchun
- P. R. China
| | - Qing Bai
- State Key Laboratory of Supramolecular Structure and Materials
- Jilin University
- Qianjin Avenue
- Changchun
- P. R. China
| | - Jinyu Li
- State Key Laboratory of Supramolecular Structure and Materials
- Jilin University
- Qianjin Avenue
- Changchun
- P. R. China
| | - Fang Lu
- Pharmacy Department
- Changchun Medical College
- People's Republic of China
| | - Xiaoyi Sun
- State Key Laboratory of Supramolecular Structure and Materials
- Jilin University
- Qianjin Avenue
- Changchun
- P. R. China
| | - Ping Lu
- State Key Laboratory of Supramolecular Structure and Materials
- Jilin University
- Qianjin Avenue
- Changchun
- P. R. China
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Kajjam AB, Vaidyanathan S. Structural Mimics of Phenyl Pyridine (ppy) - Substituted, Phosphorescent Cyclometalated Homo and Heteroleptic Iridium(III) Complexes for Organic Light Emitting Diodes - An Overview. CHEM REC 2017; 18:293-349. [PMID: 28929624 DOI: 10.1002/tcr.201700035] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Indexed: 01/13/2023]
Abstract
Today organic light emitting diodes are a topic of significant academic and industrial research interest. OLED technology is used in commercially available displays, and efforts have been directed to improve this technology. Design and synthesis of phosphorescent based transition metals are capable of harvesting both singlet and triplet excitons and achieve 100 % internal quantum efficiency is an active area of research. Among all the transition metals, iridium is considered a prime candidate for OLEDs due to its prominent photophysical characteristics. In the present review, we have concentrated on the Iridium based homo and heteroleptic complexes that have dissimilar substitutions on phenylpyridine ligands, different ancillary ligands and the effect of substitution on HOMO/LUMO energies and a brief discussion and correlation on the photophysical, electrochemical and device performances of the different complexes have been reviewed for organic light emitting diodes.
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Affiliation(s)
- Aravind Babu Kajjam
- Department of Chemistry, National Institute of Technology, Rourkela, Odisha, India
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Gou F, Cheng J, Zhang X, Shen G, Zhou X, Xiang H. Unusual Aggregation/Gelation-Induced Phosphorescence of Propeller-Type Binuclear Platinum(II) Enantiomers. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600839] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Fei Gou
- College of Chemistry; Sichuan University; 610041 Chengdu China
| | - Jinghui Cheng
- College of Chemistry; Sichuan University; 610041 Chengdu China
| | - Xiaohong Zhang
- College of Chemistry; Sichuan University; 610041 Chengdu China
| | - Guangyu Shen
- College of Chemistry; Sichuan University; 610041 Chengdu China
| | - Xiangge Zhou
- College of Chemistry; Sichuan University; 610041 Chengdu China
| | - Haifeng Xiang
- College of Chemistry; Sichuan University; 610041 Chengdu China
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Kim Y, Park S, Lee YH, Jung J, Yoo S, Lee MH. Homoleptic Tris-Cyclometalated Iridium Complexes with Substituted o-Carboranes: Green Phosphorescent Emitters for Highly Efficient Solution-Processed Organic Light-Emitting Diodes. Inorg Chem 2016; 55:909-17. [DOI: 10.1021/acs.inorgchem.5b02444] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Yejin Kim
- Department
of Chemistry and EHSRC, University of Ulsan, Ulsan 44610, Republic of Korea
| | - Sunghee Park
- Department
of Electrical Engineering, KAIST, Daejeon 34141, Republic of Korea
| | - Young Hoon Lee
- Department
of Chemistry and EHSRC, University of Ulsan, Ulsan 44610, Republic of Korea
| | - Jaehoon Jung
- Department
of Chemistry and EHSRC, University of Ulsan, Ulsan 44610, Republic of Korea
| | - Seunghyup Yoo
- Department
of Electrical Engineering, KAIST, Daejeon 34141, Republic of Korea
| | - Min Hyung Lee
- Department
of Chemistry and EHSRC, University of Ulsan, Ulsan 44610, Republic of Korea
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Yang X, Zhou G, Wong WY. Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices. Chem Soc Rev 2015; 44:8484-575. [PMID: 26245654 DOI: 10.1039/c5cs00424a] [Citation(s) in RCA: 393] [Impact Index Per Article: 43.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Phosphorescent organic light-emitting devices (OLEDs) have attracted increased attention from both academic and industrial communities due to their potential practical application in high-resolution full-color displays and energy-saving solid-state lightings. The performance of phosphorescent OLEDs is mainly limited by the phosphorescent transition metal complexes (such as iridium(III), platinum(II), gold(III), ruthenium(II), copper(I) and osmium(II) complexes, etc.) which can play a crucial role in furnishing efficient energy transfer, balanced charge injection/transporting character and high quantum efficiency in the devices. It has been shown that functionalized main-group element (such as boron, silicon, nitrogen, phosphorus, oxygen, sulfur and fluorine, etc.) moieties can be incorporated into phosphorescent emitters and their host materials to tune their triplet energies, frontier molecular orbital energies, charge injection/transporting behavior, photophysical properties and thermal stability and hence bring about highly efficient phosphorescent OLEDs. So, in this review, the recent advances in the phosphorescent emitters and their host materials functionalized with various main-group moieties will be introduced from the point of view of their structure-property relationship. The main emphasis lies on the important role played by the main-group element groups in addressing the key issues of both phosphorescent emitters and their host materials to fulfill high-performance phosphorescent OLEDs.
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Affiliation(s)
- Xiaolong Yang
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, State Key Laboratory for Mechanical Behavior of Materials, Department of Chemistry, Faculty of Science, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
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Gontarczyk K, Durka K, Klimkowski P, Luliński S, Serwatowski J, Woźniak K. Synthesis and characterization of di-, tri- and tetraboronic acids based on phenyl- and thienylsilane cores. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.01.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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10
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Lee YH, Park J, Jo SJ, Kim M, Lee J, Lee SU, Lee MH. Manipulation of Phosphorescence Efficiency of Cyclometalated Iridium Complexes by Substitutedo-Carboranes. Chemistry 2014; 21:2052-61. [DOI: 10.1002/chem.201405433] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2014] [Indexed: 11/06/2022]
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11
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Recent Progresses of Iridium Complex-Containing Macromolecules for Solution-Processed Organic Light-Emitting Diodes. J Inorg Organomet Polym Mater 2014. [DOI: 10.1007/s10904-014-0099-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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12
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Whang DR, Sakai K, Park SY. Highly Efficient Photocatalytic Water Reduction with Robust Iridium(III) Photosensitizers Containing Arylsilyl Substituents. Angew Chem Int Ed Engl 2013; 52:11612-5. [DOI: 10.1002/anie.201305684] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Indexed: 11/06/2022]
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13
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Whang DR, Sakai K, Park SY. Highly Efficient Photocatalytic Water Reduction with Robust Iridium(III) Photosensitizers Containing Arylsilyl Substituents. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201305684] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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14
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Luo J, Liu Y, Shi D, Wang Y, Zhang Z, Yu J, Lei G, Chen Q, Li J, Deng X, Zhu W. Synthesis and optoelectronic properties of a carbazole-modified platinum(ii) complex in polymer light-emitting devices. Dalton Trans 2012; 41:1074-81. [DOI: 10.1039/c1dt11346a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Lee KH, Kim SO, You JN, Kang S, Lee JY, Yook KS, Jeon SO, Lee JY, Yoon SS. tert-Butylated spirofluorene derivatives with arylamine groups for highly efficient blue organic light emitting diodes. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm14869b] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Carbazole and arylamine functionalized iridium complexes for efficient electro-phosphorescent light-emitting diodes. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.01.095] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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Ito A, Hiokawa T, Sakuda E, Kitamura N. Bright Green-phosphorescence from Metal-to-boron Charge-transfer Excited State of a Novel Cyclometalated Iridium(III) Complex. CHEM LETT 2011. [DOI: 10.1246/cl.2011.34] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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18
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Ponomarenko SA, Kirchmeyer S. Conjugated Organosilicon Materials for Organic Electronics and Photonics. SILICON POLYMERS 2010. [DOI: 10.1007/12_2009_48] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Fan C, Chen Y, Jiang Z, Yang C, Zhong C, Qin J, Ma D. Diarylmethylene-bridged triphenylamine derivatives encapsulated with fluorene: very high Tg host materials for efficient blue and green phosphorescent OLEDs. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/b927576b] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Troegel D, Möller F, Burschka C, Tacke R. 4-((2-Halogeno-5-pyridyl)dimethylsilyl)phenylboronic Acids: New Potential Building Blocks for the Synthesis of Silicon-Containing Drugs. Organometallics 2009. [DOI: 10.1021/om900175m] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Dennis Troegel
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Frank Möller
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Christian Burschka
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Reinhold Tacke
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
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You Y, Park SY. Phosphorescent iridium(iii) complexes: toward high phosphorescence quantum efficiency through ligand control. Dalton Trans 2009:1267-82. [DOI: 10.1039/b812281d] [Citation(s) in RCA: 575] [Impact Index Per Article: 38.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kim JJ, You Y, Park YS, Kim JJ, Park SY. Dendritic Ir(iii) complexes functionalized with triphenylsilylphenyl groups: Synthesis, DFT calculation and comprehensive structure-property correlation. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b913122a] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Jiang Z, Xu X, Zhang Z, Yang C, Liu Z, Tao Y, Qin J, Ma D. Diarylmethylene-bridged 4,4′-(bis(9-carbazolyl))biphenyl: morphological stable host material for highly efficient electrophosphorescence. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b910247g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Cho MJ, Kim JI, Hong CS, Kim YM, Park YW, Ju BK, Choi DH. Highly soluble green-emitting Ir(III) complexes with 9-(6-phenyl-pyridin-3-ylmethyl)-9H
-carbazole ligands and their application to polymer light-emitting diodes. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/pola.23047] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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25
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Yeh MY, Luh TY. Thorpe-Ingold Effect on the Helicity of Chiral Alternating Silylene-Divinylarene Copolymers. Chem Asian J 2008; 3:1620-4. [DOI: 10.1002/asia.200800103] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Zhou G, Wang Q, Ho CL, Wong WY, Ma D, Wang L, Lin Z. Robust Tris-Cyclometalated Iridium(III) Phosphors with Ligands for Effective Charge Carrier Injection/Transport: Synthesis, Redox, Photophysical, and Electrophosphorescent Behavior. Chem Asian J 2008; 3:1830-41. [DOI: 10.1002/asia.200800074] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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27
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Huh JO, Lee MH, Jang H, Hwang KY, Lee JS, Kim SH, Do Y. A Novel Solution-Processible Heterodinuclear AlIII/IrIII Complex for Host−Dopant Assembly OLEDs. Inorg Chem 2008; 47:6566-8. [DOI: 10.1021/ic8002806] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jung Oh Huh
- School of Molecular Science BK-21 and Center for Molecular Design and Synthesis, Department of Chemistry, KAIST, Daejeon 305-701, Korea, and R&D Center, Dongwoo FineChem Company, Ltd., 1177 Pyeongtaek-Si, Gyeonggi-Do 451-764, Korea
| | - Min Hyung Lee
- School of Molecular Science BK-21 and Center for Molecular Design and Synthesis, Department of Chemistry, KAIST, Daejeon 305-701, Korea, and R&D Center, Dongwoo FineChem Company, Ltd., 1177 Pyeongtaek-Si, Gyeonggi-Do 451-764, Korea
| | - Hyosook Jang
- School of Molecular Science BK-21 and Center for Molecular Design and Synthesis, Department of Chemistry, KAIST, Daejeon 305-701, Korea, and R&D Center, Dongwoo FineChem Company, Ltd., 1177 Pyeongtaek-Si, Gyeonggi-Do 451-764, Korea
| | - Kyu Young Hwang
- School of Molecular Science BK-21 and Center for Molecular Design and Synthesis, Department of Chemistry, KAIST, Daejeon 305-701, Korea, and R&D Center, Dongwoo FineChem Company, Ltd., 1177 Pyeongtaek-Si, Gyeonggi-Do 451-764, Korea
| | - Jong Soon Lee
- School of Molecular Science BK-21 and Center for Molecular Design and Synthesis, Department of Chemistry, KAIST, Daejeon 305-701, Korea, and R&D Center, Dongwoo FineChem Company, Ltd., 1177 Pyeongtaek-Si, Gyeonggi-Do 451-764, Korea
| | - Se Hun Kim
- School of Molecular Science BK-21 and Center for Molecular Design and Synthesis, Department of Chemistry, KAIST, Daejeon 305-701, Korea, and R&D Center, Dongwoo FineChem Company, Ltd., 1177 Pyeongtaek-Si, Gyeonggi-Do 451-764, Korea
| | - Youngkyu Do
- School of Molecular Science BK-21 and Center for Molecular Design and Synthesis, Department of Chemistry, KAIST, Daejeon 305-701, Korea, and R&D Center, Dongwoo FineChem Company, Ltd., 1177 Pyeongtaek-Si, Gyeonggi-Do 451-764, Korea
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Tao Y, Wang Q, Yang C, Zhang K, Wang Q, Zou T, Qin J, Ma D. Solution-processable highly efficient yellow- and red-emitting phosphorescent organic light emitting devices from a small molecule bipolar host and iridium complexes. ACTA ACUST UNITED AC 2008. [DOI: 10.1039/b806306k] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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Yeh MY, Lin HC, Lim TS, Lee SL, Chen CH, Fann W, Luh TY. Thorpe−Ingold Effect on Photoinduced Electron Transfer of Dialkylsilylene-Spaced Divinylarene Copolymers Having Alternating Donor and Acceptor Chromophores. Macromolecules 2007. [DOI: 10.1021/ma702197k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mei-Yu Yeh
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, Department of Physics, Tunghai University, Taichung, Taiwan 407, and Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan 106
| | - Hsin-Chieh Lin
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, Department of Physics, Tunghai University, Taichung, Taiwan 407, and Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan 106
| | - Tsong-Shin Lim
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, Department of Physics, Tunghai University, Taichung, Taiwan 407, and Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan 106
| | - Shern-Long Lee
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, Department of Physics, Tunghai University, Taichung, Taiwan 407, and Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan 106
| | - Chun-hsien Chen
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, Department of Physics, Tunghai University, Taichung, Taiwan 407, and Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan 106
| | - Wunshain Fann
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, Department of Physics, Tunghai University, Taichung, Taiwan 407, and Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan 106
| | - Tien-Yau Luh
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, Department of Physics, Tunghai University, Taichung, Taiwan 407, and Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan 106
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Chang SY, Kavitha J, Hung JY, Chi Y, Cheng YM, Li EY, Chou PT, Lee GH, Carty AJ. Luminescent Platinum(II) Complexes Containing Isoquinolinyl Indazolate Ligands: Synthetic Reaction Pathway and Photophysical Properties. Inorg Chem 2007; 46:7064-74. [PMID: 17655228 DOI: 10.1021/ic700877n] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
New Pt(II) dichloride complexes [Pt(1-iqdzH)Cl2] (2a) and [Pt(3-iqdzH)Cl2] (2b), in which idqzH = 1- or 3-isoquinolinyl indazole, were prepared by treatment of the corresponding indazoles with K2PtCl4 in aqueous HCl solution. Despite their nonemissive nature, these complexes could react with excess indazole, sodium picolinate, and 3-trifluoromethyl-5-(2-pyridyl) pyrazole [(fppz)H] to afford the respective a and b series of luminescent complexes [Pt(1-iqdz)(L/\X)] and [Pt(3-iqdz)(L/\X)], where L/\X = 1-iqdz (1a), 3-iqdz (1b), pic (3a, 3b), and fppz (4a, 4b). Single-crystal X-ray diffraction studies of 1b, 2a, and 3b revealed a planar molecular geometry without notable intermolecular Pt...Pt contact in the solid crystal, a result of the steric repulsion imposed by the bulky indazole fragments. For coordination complexes 1, 3, and 4, photoluminescence in degassed CH2Cl2 revealed high quantum efficiency and short radiative lifetimes in the range of several microseconds. As supported by the spectral feature, the associated radiation lifetimes, and a computational approach based on time-dependent density function theory (TD-DFT), the origin of the emission is attributed to a mixed 3MLCT/3pipi transition. The TD-DFT approach further confirmed that, except for the series 1 complexes, the HOMO of 3-iqdz complexes 3b and 4b is much less located at the central Pt(II) atom than the HOMO orbitals of the respective 1-iqdz complexes 3a and 4a, leading to a smaller degree of MLCT contribution. Consequently, there are a blue-shifted emission signal and an inferior emission quantum yield for the 3-iqdz derivatives. OLED devices with a multilayer configuration of ITO/NPB/CBP:3a/BCP/Alq3/LiF/Al were fabricated using a CBP layer doped with various concentrations of 3a, ranging from 6% to 100%, within the emitting layer. The best device performance was realized using a 6% doping concentration, for which the external quantum yield of 4.93%, luminous efficiency of 12.19 cd/A, and power efficiency of 6.12 lm W-1 were observed at 20 mA/cm2, while a maximum luminescence as high as 20296 cd/m2 was also realized at 16 V, showing good prospect for the fabrication of Pt(II) based OLEDs.
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Affiliation(s)
- Sheng-Yuan Chang
- Department of Chemistry, National Tsing Hua University, Hsinchu 300, Taiwan
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You Y, An CG, Kim JJ, Park SY. A Deep Red Phosphorescent Ir(III) Complex for Use in Polymer Light-Emitting Diodes: Role of the Arylsilyl Substituents. J Org Chem 2007; 72:6241-6. [PMID: 17604401 DOI: 10.1021/jo070968e] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Here we report the synthesis and electrophosphorescence of a new deep-red phosphorescent Ir(III) complex with spatially embracing and thus solubilizing arylsilyl-substituted ligands, Ir(III) tris(2-(2'-benzo[b]thienyl)-5-(4'-triphenylsilylphenyl)pyridinato-N,C3'). A poly(N-vinylcarbazole) (PVK) film doped with this Ir(III) complex exhibited excellent phase homogeneity and showed saturated red electrophosphorescence of 2.7% maximum external quantum efficiency, whose Commission Internationale de L'Eclairage coordinates were (0.69, 0.30).
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Affiliation(s)
- Youngmin You
- Department of Materials Science & Engineering, College of Engineering, Seoul National University, San 56-1, Shillim-Dong, Kwanak-Gu, Seoul 151-744, Korea
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Takizawa SY, Nishida JI, Tsuzuki T, Tokito S, Yamashita Y. Phosphorescent Iridium Complexes Based on 2-Phenylimidazo[1,2-a]pyridine Ligands: Tuning of Emission Color toward the Blue Region and Application to Polymer Light-Emitting Devices. Inorg Chem 2007; 46:4308-19. [PMID: 17429960 DOI: 10.1021/ic0624322] [Citation(s) in RCA: 127] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of new blue-phosphorescent iridium(III) complexes 1-14 with ligands of 2-phenylimidazo[1,2-a]pyridine (pip) derivatives were successfully prepared, and their electrochemical, photophysical, and electroluminescent (EL) properties were systematically investigated. It was found that the emission maxima are significantly dependent on the substituents on the phenyl ring in the range of 489-550 nm. For instance, electron-withdrawing groups such as F and CF3 shift the emission maxima to shorter wavelengths by lowering the HOMO levels (complexes 4-8), whereas the extended pi-conjugation leads to bathochromic shifts (2, 3). To obtain further information about the frontier orbital, substitution effects on the imidazole part were also investigated here, and it was found that electron-withdrawing or -donating substituents on the imidazole ring affected the emission maxima (9, 557 nm; 10, 525 nm). These results including their oxidation potentials suggest that the HOMO of the pip-based complex is a mixture of Ir-d, phenyl-pi, and imidazole-pi orbitals. From this viewpoint, combination of electron-withdrawing substituents on the phenyl ring with the use of another ancillary ligand enabled further blue shifts (13, 468, 499 nm; 14, 464, 494 nm). This new system based on pip is one of the rare examples of iridium complexes whose emissions can be tuned to the blue region. Preliminary polymer light-emitting devices (PLEDs) employing the Ir complexes were fabricated, and the devices showed moderate EL efficiencies.
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Affiliation(s)
- Shin-ya Takizawa
- Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 226-8502, Japan
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Kang JW, Lee DS, Park HD, Park YS, Kim JW, Jeong WI, Yoo KM, Go K, Kim SH, Kim JJ. Silane- and triazine-containing hole and exciton blocking material for high-efficiency phosphorescent organic light emitting diodes. ACTA ACUST UNITED AC 2007. [DOI: 10.1039/b705741e] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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