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   

  1. 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   

  1. 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: 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)