摘要
Energy-efficient lighting sources are desired to provide another solution of carbon emission reduction.White organic light-emitting diodes are promising,because of theoretical internal quantum efficiencies for 100%electric-to-light conversion.However,pure organic fluorescent materials still face a challenge in harvesting triplet excitons for radiation.Herein,we report a white fluorescent organic light-emitting diode having an external quantum efficiency of 30.7%and a power efficiency of 120.2 Im w^(-1).In the single emissive layers,we use blue thermally activated delayed fluorescent emitters to sensitize a yellow fluorescent emitter.Transient photoluminescence and electroluminescence analyses suggest that a blue thermally activated delayed fluorescent molecule with~100%reverse intersystem crossing efficiency and negligible triplet nonradiative rate constant completely converts triplet to singlet,suppressing triplet quenching by a yellow fluorescent emitter and ensuring 100%power conversion.
出处
《Research》
EI
CAS
CSCD
2023年第1期535-544,共10页
研究（英文）
基金
supported by the National Natural Science Foundation of China(92061205,62175060,51873056,61905070,and 22005088)
the Young Innovative Team Supporting Projects of Heilongjiang Province,the National Science Fund for Excellent Young Scholars of Heilongjiang Province(YQ2020B006)
the Postdoctoral Science Foundation of Heilongjiang Province(LBH-Q2116)
the Fund for Distinguished Young Scholars of Heilongjiang University(JCL202001).
