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A carbazole-based dendritic host material for efficient solution-processed blue phosphorescent OLEDs
- Source :
-
Dyes & Pigments . May2013, Vol. 97 Issue 2, p286-290. 5p. - Publication Year :
- 2013
-
Abstract
- Abstract: A dendritic host material 4,4-bis[3,6-bis(3,6-di-tert-butylcarbazol-9-yl)-carbazol-9-yl]-biphenyl for solution-processed blue phosphorescent organic light-emitting devices was designed and synthesized. Owing to the decrease of the π conjugation length of biphenyl moiety in molecule structure, this carbazole derived derivative shows high triplet energy. Furthermore, the thermal, photophysical and electrochemical properties of 4,4-bis[3,6-bis(3,6-di-tert-butylcarbazol-9-yl)-carbazol-9-yl]-biphenyl were investigated. The high triplet energy of 4,4-bis[3,6-bis(3,6-di-tert-butylcarbazol-9-yl)-carbazol-9-yl]-biphenyl ensures efficient energy transfer from the host to the triplet emitter iridium(III) bis(4,6-difluorophenylpyridinato)picolinate. The single layer device using the carbazole derivatives as the host for iridium(III) bis(4,6-difluorophenylpyridinato)picolinate showed the maximum luminance efficiencies of 5.8 cd A−1, and a maximum external quantum efficiency 2.8%. The efficiency of the carbazole derivative based device was almost 3 times higher than the corresponding 1,3-bis(9-carbazolyl)benzene based device. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 01437208
- Volume :
- 97
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Dyes & Pigments
- Publication Type :
- Academic Journal
- Accession number :
- 85584017
- Full Text :
- https://doi.org/10.1016/j.dyepig.2012.12.030