Acta Chimica Sinica ›› 2004, Vol. 62 ›› Issue (24): 2421-2424. Previous Articles     Next Articles


朱文清, 郑新友, 丁邦东, 蒋雪茵, 张志林, 许少鸿   

  1. 上海大学嘉定校区材料系, 上海, 201800
  • 收稿日期:2004-01-13 修回日期:2004-07-20 出版日期:2004-12-28 发布日期:2014-02-17
  • 通讯作者: 朱文清,
  • 基金资助:

Exciplex Emissions and Properties in Bilayer Organic Electroluminescent Diodes

ZHU Wen-Qing, ZHENG Xin-You, DING Bang-Dong, JIANG Xue-Yin, ZHANG Zhi-Lin, XU Shao-Hong   

  1. Department of Materials, Shanghai University, Jiading Campus, Shanghai 201800
  • Received:2004-01-13 Revised:2004-07-20 Online:2004-12-28 Published:2014-02-17

The bilayer organic electroluminescent diodes using two common aromatic diamines TPD (N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine) and NPB (N,N'-bis(1-naphthyl)-N,N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine) as hole transporting materials (HTM) and BBOT (2,5-bis(5-tert-butyl-2-benzoxazolyl)-thiophene) as electron transporting material have been fabricated. Redshifted and broad electroluminescent spectra relative to the fluorescent spectra of constituent materials were obtained. This electroluminescence was originated mainly from exciplexes evidenced by photoluminescence measurements, and the type of which were interpreted as the complex formed by the interaction between the excited state of BBOT (BBOT *) and ground state of the HTM in terms of the energy level diagram of the bilayer devices. By comparing the molecular structures and energy levels of TPD and NPB, it is demonstrated that exciplex formation can more easily take place for a molecule with favorable geometry and orientation than the one with appropriate energy level.

Key words: organic electroluminescence, exciplex, color tuning, molecular structure