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Pure Hydrocarbon Hosts for ≈100% Exciton Harvesting in Both Phosphorescent and Fluorescent Light‐Emitting Devices
Author(s) -
Cui LinSong,
Xie YueMin,
Wang YaKun,
Zhong Cheng,
Deng YaLi,
Liu XiangYang,
Jiang ZuoQuan,
Liao LiangSheng
Publication year - 2015
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201501376
Subject(s) - phosphorescence , fluorescence , hydrocarbon , materials science , photochemistry , phosphorescent organic light emitting diode , biphenyl , oled , quantum efficiency , exciton , optoelectronics , host (biology) , nanotechnology , organic chemistry , optics , chemistry , condensed matter physics , physics , layer (electronics) , ecology , biology
Two novel pure hydrocarbon compounds , SF33 and SF34, are designed with high triplet energies and stabilities. The efficiency of an SF34/FIrpic‐based device is as high as 22.0%. Moreover, SF33 and SF34 are also used as hosts for thermally activated delayed fluorescence organic light‐emitting diodes and achieve external quantum efficiencies in excess of 20.8% and 22.3%, respectively. The pure hydrocarbon host shows a much longer device lifetime than the traditional host 4,4′‐di( N ‐carbazolyl)biphenyl.