题目：

Highly Efficient Deep-Blue Electroluminescence from a Charge-Transfer Emitter with Stable Donor Skeleton

作者：

Wen-Cheng Chen,^† Yi Yuan,^‡ Shao-Fei Ni,^§ Ze-Lin Zhu,^† Jinfeng Zhang,^† Zuo-Quan Jiang,^‡ Liang-Sheng Liao,^*,‡ Fu-Lung Wong,^† and Chun-Sing Lee^*,†

单位：

¹Center of Super-Diamond and Advanced Films (COSDAF) and Department of Biology and Chemistry, City University of Hong Kong, Hong Kong SAR, PR China

²Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM) & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, PR China

³Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, PR China

摘要：

Organic materials containing arylamines have been widely used as hole-transporting materials as well as emitters in organic light-emitting devices (OLEDs). However, it has been pointed out that the C−N bonds in these arylamines can easily suffer from degradation in excited states, especially in deep-blue OLEDs. In this work, phenanthro[9,10-d]imidazole (PI) is proposed as a potential donor with higher stability than those of arylamines. Using PI as the donor, a donor−acceptor type deep-blue fluorophore 1-phenyl-2-(4″-(1-phenyl-1H-benzo[d]imidazol-2-yl)-[1,1′:4′,1″-terphenyl]-4-yl)-1H-phenanthro[9,10-d]imidazole (BITPI) is designed and synthesized. Results from UV-aging test on neat films of BITPI and other three arylamine compounds demonstrate that PI is indeed a more stable donor comparing to common arylamines. An OLED using BITPI as an emitter exhibits good device performances (EQE over 7%) with stable deep-blue emission (color index: (0.15, 0.13)) and longer operation lifetime than the similarly structured device using arylamine-based emitter. Single-organic layer device based on BITPI also shows superior performances, which are comparable to the best results from the arylamine-based donor−acceptor emitters, suggesting that PI is a stable donor with good hole transport/injection capability.

影响因子：

7.504

分区情况：

一区

链接：

http://pubs.acs.org/doi/abs/10.1021/acsami.6b14638