期刊
DYES AND PIGMENTS
卷 132, 期 -, 页码 94-102出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2016.04.042
关键词
Blue OLEDs; Dual emitting cores of hybridized local and charge-transfer; Solution-processability; Single-layer structure
资金
- National Natural Science Foundation of China [21574144, 51273209, 51411140244]
- Zhejiang Provincial Natural Science Foundation of China [LR16B040002]
- CAS Interdisciplinary Innovation Team
- Ningbo Municipal Science and Technology Innovative Research Team [2015811002]
- Ningbo Social Science Development Project [2014C5006004]
- Open Research Fund of Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules (Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences)
Two novel dual emitting core hybridized local and charge-transfer emitters of 4',4 '''-(1,1'-((9-(heptadecan-9-yl)-9H-carbazole-2,7-diyl)bis(4,1-phenylene))bis(1H-p-henanthro [9,10-d]imidazole-2,1-diyl)) bis(N,N-diphenyl-[1,1'-biphenyl]-4-amine) and 4',4 '''-(1,1'-((9-(heptadecan-9-yl)-9H-carbazole-2,7-diyl)bis(3,1-phenylene))bis(1H-phenanthro[9,10-d]imidazole-2,1-diyl))bis(N,N-diphenyl-[1,1'-biphenyl]-4-amine) were designed and synthesized by introducing two hybridized local and charge-transfer units for single-layer, solution-processable, and blue organic light-emitting diodes (OLEDs). Their absorption, photoluminescence, hybridized local arid charge-transfer characteristics, thermal stability and electrochemistry were systematically studied. The single-layered devices by using them as emitters showed efficient blue emission with a maximum brightness 5521 cd/m(2) for 4',4 '''-(1,1'-((9-(heptadecan-9-yl)-9H-carbazole-2,7-diyl)bis(4,1-phenylene))bis(1H-p-henanthro[9,10-d]imidazole-2,1-diyl))bis(N,N-diphenyl-[1,1'-biphenyl]-4-amine) and 4403 cd/m(2) for 4',4 '''-(1,1'((9-(heptadecan-9-yl)-9H-carbazole-2,7-diyl)bis(3,1-phenylene))bis(1H-phenanthro [9,10-d]imidazole-2,1-diyl))bis(N,N-diphenyl-[1,1'-biphenyl]-4-amine). The maximal efficiencies of the former were up to 3.71 cd/A, 233 lm/W, and 2.88%. Furthermore, at the high luminescence, the device still indicated good performance with relative low efficiency roll-off. The relationships of structures and properties were also discussed. Most importantly, we provided a new method to construct solution processable small molecules for highly efficient single-layer OLEDs. (C) 2016 Elsevier Ltd. All rights reserved.
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