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Issue 7, 2012
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Simple CBP isomers with high triplet energies for highly efficient blue electrophosphorescence

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Abstract

Two simple CBP isomers, namely mm-CBP and ooo-CBP, were designed and synthesized by finely tuning the linking topology between the carbazole and the central biphenyl units of CBP, and their thermal, photophysical and electrochemical properties were investigated. Such simple modification of the linking topology endows the CBP isomers with high triplet energy and relative high thermal and morphological stability. The high triplet energies of mm-CBP and ooo-CBP ensure efficient energy transfer from the host to the phosphor and triplet exciton confinement on the phosphor, as indicated by the transient photoluminescence decay of 3 wt% FIrpic doped into mm-CBP and ooo-CBP. Blue phosphorescent devices employing FIrpic as guest and the two CBP isomers as hosts exhibit high efficiencies. The best EL performance is achieved for the ooo-CBP-based device, with a maximum current efficiency of 29.9 cd A−1, and a maximum external quantum efficiency of 14.2%, which are over 2 times higher than those of CBP.

Graphical abstract: Simple CBP isomers with high triplet energies for highly efficient blue electrophosphorescence

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Supplementary files

Article information


Submitted
30 Sep 2011
Accepted
08 Nov 2011
First published
21 Dec 2011

J. Mater. Chem., 2012,22, 2894-2899
Article type
Paper

Simple CBP isomers with high triplet energies for highly efficient blue electrophosphorescence

S. Gong, X. He, Y. Chen, Z. Jiang, C. Zhong, D. Ma, J. Qin and C. Yang, J. Mater. Chem., 2012, 22, 2894
DOI: 10.1039/C1JM14903B

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