LiF Layer at the Interface of Au Cathode in Organic Light-Emitting Devices: A Nonchemical Induced Carrier Injection Enhancement

Au is not a suitable cathode material of organic light-emitting device because of its high work function resulting in poor electron injection. However, in present work, it is found that the performance of Au-cathode OLEDs can be efficiently improved by introducing a LiF buffer layer and with its opt...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2012-01, Vol.116 (3), p.2543-2547
Main Authors: Sun, Zhengyi, Ding, Baofu, Wu, Bo, You, Yintao, Ding, Xunmin, Hou, Xiaoyuan
Format: Article
Language:English
Subjects:
Applied sciences
C: Electron Transport, Optical and Electronic Devices, Hard Matter
Electronics
Exact sciences and technology
Optoelectronic devices
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
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Summary:Au is not a suitable cathode material of organic light-emitting device because of its high work function resulting in poor electron injection. However, in present work, it is found that the performance of Au-cathode OLEDs can be efficiently improved by introducing a LiF buffer layer and with its optimal thickness can even be comparable to that of conventional Al-cathode device. The relationship between the thickness of LiF layer and the performance improvement is investigated. The experimental results indicate a quite different mechanism of LiF thin layer from that of Al-cathode device, which is not chemical-reaction-mechanism-dominant. Other insulator material buffer layers such as Al2O3 and BCP are also investigated.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp205871a