Molecular Spacing Modulated Conversion of Singlet Fission to Triplet Fusion in Rubrene-Based Organic Light-Emitting Diodes at Ambient Temperature
作者： Weiyao Jia , Qiusong Chen , Lixiang Chen , De Yuan , Jie Xiang
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摘要: Triplet fusion (TF) and singlet fission (SF) are two important spin-coupled exciton interactions that occur in rubrene-based organic light-emitting diodes (OLEDs). TF produces additional singlets, which increases fluorescence efficiency, while SF consumes singlets lowers the efficiency. In an effort to adjust processes OLEDs, we changed average molecular spacing (d) of rubrene by doping it at varying concentrations high triplet energy material 1,3-bis(9-carbazolyl)benzene (mCP). Using magneto-electroluminescence (MEL), observed increased, decreased ambient temperature as d was increased from 1.8 5.0 nm. This further confirmed using MEL different temperatures current intensities. We found efficiency OLEDs improved altering value d, with highest being = 3.8 nm because complete conversion (SF → TF). The explained ...
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