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Harnessing Triplet Excited States by Fluorescent Dopant Utilizing Codoped Phosphorescent Dopant in Exciplex Host for Efficient Fluorescent Organic Light Emitting Diodes
Author(s) -
Kim HyunGu,
Kim KwonHyeon,
Moon ChangKi,
Kim JangJoo
Publication year - 2017
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201600749
Subject(s) - phosphorescence , intersystem crossing , oled , phosphorescent organic light emitting diode , fluorescence , dopant , optoelectronics , materials science , common emitter , quantum efficiency , exciton , singlet state , excited state , photochemistry , doping , nanotechnology , physics , chemistry , optics , atomic physics , layer (electronics) , quantum mechanics
The singlet fraction of excitons on a conventional fluorescent emitter is increased by reverse intersystem crossing of exciplexes and the sensitization effect of phosphorescent materials. Consequently, a red fluorescent organic light‐emitting diode (OLED) with an external quantum efficiency (EQE) of 23.7% is realized and an EQE of nearly 30% may be expected if all singlet excitons in the fluorescent emitter decay radiatively.