期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 18, 页码 9625-9629出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b01220
关键词
green fluorescent device; bipolar host; high quantum efficiency; high triplet energy; delayed fluorescence
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science, and Technology [2013R1A1A2007991]
- Ministry of Science, ICT, and future Planning [2013R1A2A2A01067447]
Highly efficient green thermally activated delayed fluorescent organic light-emitting diodes with an external quantum efficiency of 31.2% were investigated by using 3-(3-(carbazole-9-yl)phenyl) pyrido[3',2':4,5]furo[2,3-b]pyridine (3CzPFP) derived from carbazole and pyrido[3',2':4,5]furo[2,3-b]pyridine. The host material showed well-matched photoluminescence emission with absorption of the green dopant material, (4s,6s)-2,4,5,6-tetra(9H-carbazol-9-yl)isophthalonitrile (4CzIPN) and harvested all excitons of 4CzIPN. The 3CzPFP:4CzIPN film exhibited high photoluminescence quantum yield of 100%, and the green delayed fluorescence device employing the 3CzPFP host showed high maximum quantum efficiency of 31.2 +/- 0.5% at 1% doping after optimization of the device structure.
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