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New tetrafluorophenylene/carbazole hybrid host materials for phosphorescence organic light-emitting diodes

Abstract

Two novel carbazole based compounds, namely 9,9',9'',9'''-(2',3',5',6'-tetrafluoro-[1,1':4',1''-terphenyl]-3,3'',5,5''-tetrayl)tetrakis(9H-carbazole) (CzF) and 9,9',9'',9'''-(2',3',5',6'-tetrafluoro-[1,1':4',1''-terphenyl]-3,3'',5,5''-tetrayl)tetrakis(3,6-di-tert-butyl-9H-carbazole) (TCzF), were designed and synthesized for application as host materials in phosphorescence organic light-emitting diodes (OLEDs). Tetrafluorophenylene was selected as the linking bridge to tune the photophysical and optoelectronic properties of these two compounds. Extremely high glass transition temperatures of 198 ℃ and 330 ℃ were detected for them. Green phosphorescence OLEDs were fabricated by vacuum evaporation using CzF and TCzF as hosts and tris[2-phenylpyridinato-C2,N] iridium(III) (Ir(ppy)3) as doped emitter. Good performance was obtained with a maximum current efficiency of 66.3 cd/A (corresponding to an external quantum efficiency of 18.3% and a power efficiency of 46.24 lm/W) for CzF hosted device. TCzF exhibited inferior performance relative to CzF, which was attributed to the presence of insulating tert-butyl groups in the surface of TCzF.

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Publication details

The article was received on 11 Jul 2018, accepted on 09 Aug 2018 and first published on 09 Aug 2018


Article type: Paper
DOI: 10.1039/C8NJ03453B
Citation: New J. Chem., 2018, Accepted Manuscript
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    New tetrafluorophenylene/carbazole hybrid host materials for phosphorescence organic light-emitting diodes

    L. Xie and D. Liu, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ03453B

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