Achievement of complete electromer emission in organic light-emitting diodes

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• 作者：Xinjun Xu ; Gui Yu ; ^{yugui@iccas.ac.cn} ; Yongqiang Ma ; Kefeng Shao ; Lianming Yang ; Yunqi Liu ; ^{liuyq@iccas.ac.cn}
• 关键词：Electromer ; Organic light-emitting diodes ; Excited states ; Electroluminescence ; Photoluminescence
• 刊名：Journal of Luminescence
• 出版年：2013
• 出版时间：April, 2013
• 年：2013
• 卷：136
• 期：Complete
• 页码：208-211
• 全文大小：433 K

文摘

Electromer is a unique excited-state species which can only be formed under electrical excitation. Currently, a clear understanding of electromer has not been realized yet. A big obstacle is that the electromer emission can hardly be separated from the emission of molecular excitons. Obtaining a complete electromer emission is essential for photophysical investigations of this kind of excited-state species and is useful for its potential application in optoelectronic logic gates. We report that a complete electromer emission can be achieved by introduction of a weak-fluorescence layer in organic light-emitting diodes, which will quench the molecular excitons produced in the adjacent emissive layer but leave the electromers undisturbed. In addition, a possible mechanism for the electromer formation is proposed based on the analysis of the single crystal structure of the compound 9,9-bis[4-(di-p-tolyl)aminophenyl]-2,7-bis(9-carbazolyl)fluorene which can produce electromers.