Journal
ACS PHOTONICS
Volume 4, Issue 3, Pages 449-453Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.6b00882
Keywords
electron transport material; roll-off; solution process; blue phosphorescent OLEDs; high efficiency
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Funding
- National Program on Key Basic Research Project (973 Program) [2015CB3S1901]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09020201]
- National Program on Key Research Project [2016YFB0401500]
- National Natural Science Foundation of China (NSFC) [21402233]
- Natural Science Foundation of Jiangsu Province [BK2012631, BK20140387]
- Project on the Integration of Industry, Education and Research of Jiangsu Province [BY2014066]
- Research Fund for the Nanotech Program of Suzhou City [ZXG201418]
- Youth Innovation Promotion Association CAS [2013206]
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A novel cross-linkable electron transport material, 1,3,5-tris(5(4-vinylphenyl)pyridin-3-yl)benzene (TV-TmPY), for solution-processing as well as a small molecule, 1,3,5-tris(5-phenylpyridin-3-yl)benzene (TmPY), for vacuum deposition were designed and synthesized for OLEDs. TV-TmPY and TmPY with identical core structures are fully characterized to systematically investigate the impact of solution processing and vacuum deposition on the performance of phosphorescent OLEDs. Over 90% EQE (external quantum efficiency) was achieved for the solution-processed TV-TmPY-based device compared to that of the vacuum-deposited TmPY at a luminance of 1000 cd m(-2). An EQE deviation of 0.7% was observed ranging from 100 to 1000 cd m(-2) with TV-TmPY, which is the smallest value to date for solution-processed OLEDs, and over 12% EQEs were achieved for the trilayered solution processed green and blue phosphorescent OLEDs.
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