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Applied Physics A

, Volume 118, Issue 1, pp 381–387 | Cite as

Origin of improved stability in green phosphorescent organic light-emitting diodes based on a dibenzofuran/spirobifluorene hybrid host

  • Lei Zhang
  • Shou-Cheng Dong
  • Chun-Hong Gao
  • Xiao-Bo Shi
  • Zhao-Kui WangEmail author
  • Liang-Sheng LiaoEmail author
Article

Abstract

A highly efficient and stable green phosphorescent organic light-emitting diode (PHOLED) was fabricated by using a new dibenzofuran/spirobifluorene hybrid material (named as DBFSF2) as the host material. The DBFSF2-based PHOLEDs exhibited slightly better electroluminescence efficiency than that in the conventional host material 4,4′-bis(carbazol-9-yl)biphenyl (CBP)-based ones. Moreover, further studies demonstrated that the DBFSF2-based PHOLEDs had a better stability with about 1.5 times improvement in half lifetime compared with that of CBP-based ones. To investigate the mechanism behind the enhanced stability in the DBFSF2-based PHOLEDs, the evaluations of dark spots growth, film crystallization properties and carrier recombination zone were carried out.

Keywords

Acac High Occupied Molecular Orbital Current Efficiency Host Material Triplet Energy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We acknowledge financial support from the Natural Science Foundation of China (Nos. 61036009, 61177016, 21161160446, and 61307036), the National High-Tech Research Development Program (No. 2011AA03A110), the Natural Science Foundation of Jiangsu Province (No. BK2010003, BK20130288), and the Key University Science Research Project of Jiangsu Province (12KJB510028). This is also a project funded by Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and by the Fund for Excellent Creative Research Teams of Jiangsu Higher Education Institutions.

Supplementary material

339_2014_8746_MOESM1_ESM.docx (152 kb)
Supplementary material 1 (DOCX 152 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Institute of Functional Nano and Soft Materials (FUNSOM)Soochow UniversitySuzhouChina

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