Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume 12, Issue 17, Pages 2189-2196Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201700833
Keywords
aggregation induced emission; electroluminescent materials; non-doped; organic electronics; organic light-emitting diodes (OLEDs)
Categories
Funding
- National Natural Science Foundation of China [21574144, 21674123]
- National Key R&D Program of China [2016YFB0401000]
- Zhejiang Provincial Natural Science Foundation of China [LR16B040002]
- Ningbo Municipal Science and Technology Innovative Research Team [2015B11002, 2016B10005]
- CAS Interdisciplinary Innovation Team
- CAS Key Project of Frontier Science Research [QYZDB-SSW-SYS030]
- CAS Key Project of International Co-operation [174433KYSB20160065]
- University of Chinese Academy of Sciences
- World Academy of Sciences
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Blue organic light-emitting diodes (OLEDs) are necessary for flat-panel display technologies and lighting applications. To make more energy-saving, low-cost and long-lasting OLEDs, efficient materials as well as simple structured devices are in high demand. However, a very limited number of blue OLEDs achieving high stability and color purity have been reported. Herein, three new sky-blue emitters, 1,4,5-triphenyl-2-(4-(1,2,2-triphenylvinyl)phenyl)-1H-imidazole (TPEI), 1-(4-methoxyphenyl)-4,5-diphenyl-2-(4-(1,2,2-triphenylvinyl)phenyl)-1H-imidazole (TPEMeOPhI) and 1-phenyl-2,4,5-tris(4-(1,2,2-triphenylvinyl)phenyl)-1H-imidazole (3TPEI), with a combination of imidazole and tetraphenylethene groups, have been developed. High photoluminescence quantum yields are obtained for these materials. All derivatives have demonstrated aggregation-induced emission (AIE) behavior, excellent thermal stability with high decomposition and glass transition temperatures. Non-doped sky-blue OLEDs with simple structure have been fabricated employing these materials as emitters and realized high efficiencies of 2.41% (4.92cdA(-1), 2.70lmW(-1)), 2.16 (4.33cdA(-1), 2.59lmW(-1)) and 3.13% (6.97cdA(-1), 4.74lmW(-1)) for TPEI, TPEMeOPhI and 3TPEI, with small efficiency roll-off. These are among excellent results for molecules constructed from the combination of imidazole and TPE reported so far. The high performance of a 3TPEI-based device shows the promising potential of the combination of imidazole and AIEgen for synthesizing efficient electroluminescent materials for OLED devices.
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