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We report that a novel exciton feedback effect is observed by introducing the bis(2-methyl-8-quinolinolato)(4-phenylphenolato)aluminum (BAlq) inserted between the emitting layer (EML) and the electron transporting layer in blue organic light emitting diodes.As an exciton feedback layer (EFL),the BAlq does not act as a traditional hole blocking effect.The design of this kind of device structure can greatly reduce excitons' quenching due to accumulated space charge at the exciton formation interface.Meanwhile,the non-radiative energy transfer from EFL to the EML can also be utilized to enhance the excitons' formation,which is confirmed by the test of photolumimescent transient lifetime decay and electroluminescence enhancement of these devices.Accordingly,the optimal device presents the improved performances with the maximum current e~ciency of 4.2 cd/A and the luminance of 24600cd/m2,which are about 1.45 times and 1.75 times higher than those of device A (control device) without the EFL,respectively.Simultaneously,the device shows an excellent color stability with a tiny offset of the CIE coordinates (Ax =±0.003,Ay =±0.004) and a relatively lower efficiency roll-off of 26.2% under the driving voltage varying from 3 V to 10 V.
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篇名 Efficiency of Blue Organic Light-emitting Diodes Enhanced by Employing an Exciton Feedback Layer
来源期刊 中国物理快报(英文版) 学科
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年,卷(期) 2016,(8) 所属期刊栏目
研究方向 页码范围 146-150
页数 5页 分类号
字数 语种 中文
DOI 10.1088/0256-307X/33/8/088503
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中国物理快报(英文版)
月刊
0256-307X
11-1959/O4
16开
北京中关村中国科学院物理研究所内
1984
eng
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