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Issue 31, 2014
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A rational design of carbazole-based host materials with suitable spacer group towards highly-efficient blue phosphorescence

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Abstract

Two novel carbazole derivatives, 3,3′-(2,6-dimethyl-1,4-phenylene)bis(9-phenyl-9H-carbazole) (DMCz) and 3,3′-(2,3,5,6-tetramethyl-1,4-phenylene)bis(9-phenyl-9H-carbazole) (TMCz), are designed and synthesized as host materials for blue phosphorescent organic light emitting diodes (PHOLEDs). Both the materials possess sufficiently high glass transition temperatures and triplet energies for the blue dopant Ir-complex iridium(III) bis(4,6-(difluorophenyl)-pyridinato-N,C′)picolinate (FIrpic, 2.65 eV). The device using DMCz as the host material showed a better performance than that of TMCz with a maximum power efficiency of 36.0 ± 0.7 lm per W, a maximum current efficiency of 43.7 ± 0.6 cd per A and a maximum external quantum efficiency (EQE) of 18.5 ± 0.1%.

Graphical abstract: A rational design of carbazole-based host materials with suitable spacer group towards highly-efficient blue phosphorescence

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Publication details

The article was received on 29 Apr 2014, accepted on 05 Jun 2014 and first published on 12 Jun 2014


Article type: Paper
DOI: 10.1039/C4TC00867G
J. Mater. Chem. C, 2014,2, 6387-6394

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    A rational design of carbazole-based host materials with suitable spacer group towards highly-efficient blue phosphorescence

    X. Yuan, J. Liang, Y. He, Q. Li, C. Zhong, Z. Jiang and L. Liao, J. Mater. Chem. C, 2014, 2, 6387
    DOI: 10.1039/C4TC00867G

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