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《Journal of Zhejiang University(Engineering Science)》 2010-01
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Current limitation mechanism of polymer light-emitting devices

ZHU De-xi,YE Hui,WANG Jun-pei,ZHEN Hong-yu(State Key Laboratory of Modern Optical Instrumentation,Zhejiang University,Hangzhou 310027,China)  
Conjugated polymer (poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylene vinylene),MEH-PPV) based polymer light-emitting devices (PLEDs) were fabricated with composite cathode (LiF/Al).The current-voltage characteristics of the devices with different thickness of LiF layer and MEH-PPV layer were measured and analyzed in order to investigate the current limitation mechanism of PLEDs.The results show that the charge carrier transport limitation exhibits in the case of single metal cathode,while the charge carrier injection limitation is dominant when the LiF buffer layer is at a certain thickness (2 nm here).When the LiF buffer layer deviates from 2 nm,the current is limited by both two current limitation mechanisms.A simulation model about the current-voltage characteristic of the devices with different LiF layer thickness was developed,and the calculated results agreed well with the experimental data.
【Fund】: 国家博士后科学基金资助项目(20070410394)
【CateGory Index】: TN383.1
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