Optimization of a poly(p-phenylene benzobisoxazole)-based light-emitting device with a complex cathode structure

doi:10.1088/1674-1056/22/11/117805

Abstract In this work, we report the preparation of a series of electroluminescent (EL) devices based on a high-performance polymer, poly(p-phenylene benzobisoxazole) (PBO), and their optoelectronic properties, which have been rarely explored. The device structure is optimised using a complex cathode structure of tris-(8-hydoxyquinoline) aluminium (Alq₃)/LiF/Al. By tuning the thickness of the Alq₃ layer, we improve the device efficiency dramatically in an optimized condition. Further analysis reveals that the Alq₃ layer in the complex cathode structure acts as a hole blocker in addition to its electron-injection role. A green light emission with a maximum brightness of 8.7×10³ cd/m² and a moderate current efficiency of 4.8 cd/A is obtained. These values are the highest ever reported for PBO devices. The high operational stability demonstrated by the present device makes it a promising tool for display and lighting applications. A new material is added to the selection of polymers used in this field up to now.

Keywords: electroluminescence organic semiconductors light-emitting devices electronic transport phenomena

Received: 20 April 2013
Revised: 27 June 2013
Accepted manuscript online:

PACS:	78.60.Fi	(Electroluminescence)
	81.05.Fb	(Organic semiconductors)
	85.60.Jb	(Light-emitting devices)
	73.50.-h	(Electronic transport phenomena in thin films)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 21174016), the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20120009110031), and the 111 Project of China (Grant No. B08002).

Corresponding Authors: He Zhi-Qun
E-mail: zhqhe@bjtu.edu.cn

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Zhang Xiao-Jin (张晓晋), He Zhi-Qun (何志群), Wang Jing (汪璟), Mu Lin-Ping (穆林平), Zhao Huan (赵瓛), Liang Chun-Jun (梁春军), Zhuang Qi-Xin (庄启昕), Han Zhe-Wen (韩哲文) Optimization of a poly(p-phenylene benzobisoxazole)-based light-emitting device with a complex cathode structure 2013 Chin. Phys. B 22 117805

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Optimization of a poly(p-phenylene benzobisoxazole)-based light-emitting device with a complex cathode structure

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