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

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

中国物理B ›› 2013, Vol. 22 ›› Issue (11): 117805-117805.doi: 10.1088/1674-1056/22/11/117805

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

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

张晓晋^a, 何志群^a, 汪璟^a, 穆林平^a, 赵瓛^a, 梁春军^a, 庄启昕^b, 韩哲文^b

a Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China;
b Key Laboratory for Specially Functional Polymeric Materials and Related Technology, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

收稿日期:2013-04-20 修回日期:2013-06-27 出版日期:2013-09-28 发布日期:2013-09-28
基金资助:
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).

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

Zhang Xiao-Jin (张晓晋)^a, He Zhi-Qun (何志群)^a, Wang Jing (汪璟)^a, Mu Lin-Ping (穆林平)^a, Zhao Huan (赵瓛)^a, Liang Chun-Jun (梁春军)^a, Zhuang Qi-Xin (庄启昕)^b, Han Zhe-Wen (韩哲文)^b

a Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China;
b Key Laboratory for Specially Functional Polymeric Materials and Related Technology, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

Received:2013-04-20 Revised:2013-06-27 Online:2013-09-28 Published:2013-09-28
Contact: He Zhi-Qun E-mail:zhqhe@bjtu.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: electroluminescence, organic semiconductors, light-emitting devices, electronic transport phenomena

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.

Key words: electroluminescence, organic semiconductors, light-emitting devices, electronic transport phenomena

中图分类号: (Electroluminescence)

78.60.Fi

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

张晓晋, 何志群, 汪璟, 穆林平, 赵瓛, 梁春军, 庄启昕, 韩哲文. Optimization of a poly(p-phenylene benzobisoxazole)-based light-emitting device with a complex cathode structure[J]. 中国物理B, 2013, 22(11): 117805-117805.

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[J]. Chin. Phys. B, 2013, 22(11): 117805-117805.

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

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

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