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Zhang M, Zhang SW, Wu C, Li W, Wu Y, Yang C, Meng Z, Xu W, Tang MC, Xie R, Meng H, Wei G. Fine Emission Tuning from Near-Ultraviolet to Saturated Blue with Rationally Designed Carbene-Based [3 + 2 + 1] Iridium(III) Complexes. ACS APPLIED MATERIALS & INTERFACES 2022; 14:1546-1556. [PMID: 34978413 DOI: 10.1021/acsami.1c19127] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
We designed and synthesized a new class of six phosphorescent [3 + 2 + 1] iridium(III) complexes [(pbib)Ir(C^C)CN] bearing a tridentate 1,3-bis(1-butylimidazolin-2-ylidene) phenyl N-heterocyclic carbene (NHC)-based pincer ligand (pbib), bidentate imidazole-based NHC ligands (C^C), and a monodentate cyano group and investigated their photophysical, electrochemical, and thermal stabilities and electroluminescent properties. The extended π-conjugation of the imidazole-based C^C ligand is found to be the key to fine-tune the emission energies from ultraviolet blue (λ = 378 nm) to saturated blue (λ = 482 nm), as shown by electrochemical and photophysical studies, which is also revealed by the density functional theory (DFT) and time-dependent DFT calculations. Vacuum-deposited organic light-emitting diode devices have been fabricated with these newly synthesized emitters and exhibited the best external quantum efficiency of 6.4% and Commission International de L'Éclairage (CIE) coordinates of (0.163, 0.096), where the CIE y is very similar to the National Television System Committee standard blue CIE (x, y) coordinates of (0.149, 0.085). These results indicate that the novel [3 + 2 + 1] coordinated iridium(III) complexes [(pbib)Ir(C^C)CN], having a saturated blue emission, not only could alleviate the photodegradation of the emitters when compared to [(pbib)Ir(pmi)CN] but also provide new design strategies of saturated-blue-emitting iridium(III) complexes.
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Affiliation(s)
- Meng Zhang
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen 518055, China
- Institute of Materials Science, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Si-Wei Zhang
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen 518055, China
- Institute of Materials Science, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Chengcheng Wu
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen 518055, China
- Institute of Materials Science, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Wansi Li
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen 518055, China
- Institute of Materials Science, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Yuan Wu
- PURI Materials, Shenzhen 518133, China
| | - Chen Yang
- PURI Materials, Shenzhen 518133, China
| | - Zhimin Meng
- School of Advanced Materials, Peking University, Shenzhen Graduate School, Peking University, Shenzhen 518055, China
| | - Wenzhan Xu
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen 518055, China
- Institute of Materials Science, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Man-Chung Tang
- Institute of Materials Science, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Rongjun Xie
- College of Materials, Xiamen University, Xiamen 361005, China
| | - Hong Meng
- School of Advanced Materials, Peking University, Shenzhen Graduate School, Peking University, Shenzhen 518055, China
| | - Guodan Wei
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen 518055, China
- Institute of Materials Science, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
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Liu Z, Zhang SW, Zhang M, Wu C, Li W, Wu Y, Yang C, Kang F, Meng H, Wei G. Highly Efficient Phosphorescent Blue-Emitting [3+2+1] Coordinated Iridium (III) Complex for OLED Application. Front Chem 2021; 9:758357. [PMID: 34692648 PMCID: PMC8529235 DOI: 10.3389/fchem.2021.758357] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Accepted: 09/15/2021] [Indexed: 11/26/2022] Open
Abstract
Cyclometalated iridium (III) complexes are indispensable in the field of phosphorescent organic light-emitting diodes (PhOLEDs), while the improvement of blue iridium (III) complexes is as yet limited and challenging. More diversified blue emitters are needed to break through the bottleneck of the industry. Hence, a novel [3+2+1] coordinated iridium (III) complex (noted as Ir-dfpMepy-CN) bearing tridentate bis-N-heterocyclic carbene (NHC) chelate (2,6-bisimidazolylidene benzene), bidentate chelates 2-(2,4-difluorophenyl)-4-methylpyridine (dfpMepy), and monodentate ligand (-CN) has been designed and synthesized. The tridentate bis-NHC ligand enhances molecular stability by forming strong bonds with the center iridium atom. The electron-withdrawing groups in the bidentate ligand (dfpMepy) and monodentate ligand (-CN) ameliorate the stability of the HOMO levels. Ir-dfpMepy-CN shows photoluminescence peaks of 440 and 466 nm with a high quantum efficiency of 84 ± 5%. Additionally, the HATCN (10 nm)/TAPC (40 nm)/TcTa (10 nm)/10 wt% Ir-dfpMepy-CN in DPEPO (10 nm)/TmPyPB (40 nm)/Liq (2.5 nm)/Al (100 nm) OLED device employing the complex shows a CIE coordinate of (0.16, 0.17), reaching a deeper blue emission. The high quantum efficiency is attributed to rapid singlet to triplet charge transfer transition of 0.9–1.2 ps. The successful synthesis of Ir-dfpMepy-CN has opened a new window to develop advanced blue emitters and dopant alternatives for future efficient blue PhOLEDs.
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Affiliation(s)
- Zijian Liu
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen, China
| | - Si-Wei Zhang
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen, China
| | - Meng Zhang
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen, China
| | - Chengcheng Wu
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen, China
| | - Wansi Li
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen, China
| | - Yuan Wu
- PURI Materials, Shenzhen, China
| | | | - Feiyu Kang
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen, China.,Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
| | - Hong Meng
- Peking University Shenzhen Graduate School, Peking University, Shenzhen, China
| | - Guodan Wei
- Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen, China.,Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
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Zhang H, Li W, Yan X, Cai W, Li M, He R, Shen W. Electronic structure and luminescence properties of unique complexes: cyclometalated iridium(iii) chelated by o-carboranyl-pyridine ligands. NEW J CHEM 2018. [DOI: 10.1039/c8nj00428e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Iridium(iii) complexes that use o-carborane as a chelating ligand have been theoretically investigated for the first time. The superior properties of complexes will potentially promote the discovery of efficient blue-emitting complexes.
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Affiliation(s)
- Huize Zhang
- School of Chemistry and Chemical Engineering
- Southwest University
- Chongqing 400715
- China
| | - Wenqian Li
- School of Chemistry and Chemical Engineering
- Southwest University
- Chongqing 400715
- China
| | - Xi Yan
- School of Chemistry and Chemical Engineering
- Southwest University
- Chongqing 400715
- China
| | - Wanlin Cai
- School of Chemistry and Chemical Engineering
- Southwest University
- Chongqing 400715
- China
| | - Ming Li
- School of Chemistry and Chemical Engineering
- Southwest University
- Chongqing 400715
- China
| | - Rongxing He
- School of Chemistry and Chemical Engineering
- Southwest University
- Chongqing 400715
- China
| | - Wei Shen
- School of Chemistry and Chemical Engineering
- Southwest University
- Chongqing 400715
- China
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Li YS, Liao JL, Lin KT, Hung WY, Liu SH, Lee GH, Chou PT, Chi Y. Sky Blue-Emitting Iridium(III) Complexes Bearing Nonplanar Tetradentate Chromophore and Bidentate Ancillary. Inorg Chem 2017; 56:10054-10060. [DOI: 10.1021/acs.inorgchem.7b01583] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Yu-Sian Li
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Jia-Ling Liao
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Ke-Ting Lin
- Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung 202, Taiwan
| | - Wen-Yi Hung
- Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung 202, Taiwan
| | - Shih-Hung Liu
- Department of Chemistry and Instrumentation Center, National Taiwan University, Taipei 10617, Taiwan
| | - Gene-Hsiang Lee
- Department of Chemistry and Instrumentation Center, National Taiwan University, Taipei 10617, Taiwan
| | - Pi-Tai Chou
- Department of Chemistry and Instrumentation Center, National Taiwan University, Taipei 10617, Taiwan
| | - Yun Chi
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
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Maity A, Sarkar R, Rajak KK. Heteroleptic iridium(iii) complexes bearing a coumarin moiety: an experimental and theoretical investigation. RSC Adv 2015. [DOI: 10.1039/c5ra08349d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Three mononuclear heteroleptic Ir(iii) complexes have been synthesized. The electronic structure and the spectral properties of the complexes were calculated applying the DFT-TDDFT method. The chemical shift was also computed by the GIAO-DFT method.
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Affiliation(s)
- Amit Maity
- Inorganic Chemistry Section
- Department of Chemistry
- Jadavpur University
- Kolkata 700032
- India
| | - Rupa Sarkar
- Inorganic Chemistry Section
- Department of Chemistry
- Jadavpur University
- Kolkata 700032
- India
| | - Kajal Krishna Rajak
- Inorganic Chemistry Section
- Department of Chemistry
- Jadavpur University
- Kolkata 700032
- India
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