Hybrid Local and Charge Transfer Emitters Utilizing Hyperconjugation Effect Towards Solution-Processed Ultra-Deep-Blue OLEDs with External Quantum Efficiency Approaching 12%

被引:0
作者
Liao, Chuanxin [1 ,2 ]
Wang, Shirong [1 ,2 ]
Chen, Bo [1 ,2 ]
Xie, Qi [1 ,2 ]
Feng, Jingyuan [1 ,2 ]
Bai, Jiaxu [1 ,2 ]
Li, Xianggao [1 ,2 ]
Liu, Hongli [1 ,2 ]
机构
[1] Tianjin Univ, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China
[2] Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China
基金
中国国家自然科学基金;
关键词
hyperconjugation effect; spiro[1,8-diazafluorene-9,2 '-imidazole; hybrid local and charge transfer; ultra-deep-blue; organic light-emitting diodes; TRANSFER EXCITED-STATE; LIGHT-EMITTING-DIODES; HIGHLY EFFICIENT; ELECTROLUMINESCENCE; DEVICES; FLUORESCENCE; DERIVATIVES; EQE;
D O I
10.1002/anie.202414905
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Hybrid local and charge transfer (HLCT) excited state materials, which possess weak donor-acceptor (D-A) pure organic structures, deserve one of the most promising efficient and stable blue emitters. Through high-lying reverse intersystem crossing (hRISC) process, 75% triplet excitons generated by electrical excitation could be harvested and utilized in organic light-emitting diodes (OLEDs). However, there are still significant challenges to achieve high-efficiency ultra-deep-blue HLCT emitters with low Commission Internationale de l'Eclairage (CIE) 1931 chromaticity coordinate y values. Here, a series of novel blue HLCT emitters based on spiro[1,8-diazafluorene-9,2 '-imidazole] structure were designed and synthesized by fine-tuning the spiro[fluorene-9,2 '-imidazole] core structure in our previous work through heteroatom substitution and hyperconjugation effect. The target emitters were endowed with excellent photophysical and electrochemical merits, thermal stability and solution processibility. The solution-processed OLED based on 4 ',5 '-bis(4-(9H-carbazol-9-yl)phenyl)spiro[1,8-diazafluorene-9,2 '-imidazole] (NFIP-CZ) achieved efficient ultra-deep-blue emission (CIEx,y=0.1581, 0.0422) with the maximum external quantum efficiency (EQE(max)), maximum current efficiency (CEmax) and maximum power efficiency (PEmax) of 11.94%, 4.07cd.A(-1) and 2.56lm.W-1. The record EQE is a breakthrough in both solution-processed and vacuum vapor deposition ultra-deep-blue HLCT OLEDs currently.
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页数:16
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