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Beilstein J Org Chem. 2018 Apr 17;14:869-874. doi: 10.3762/bjoc.14.73. eCollection 2018.

Two novel blue phosphorescent host materials containing phenothiazine-5,5-dioxide structure derivatives.

Xie FM1,2, Ou Q3, Zhang Q1,2, Zhang JK1,2, Dai GL1,2, Zhao X1,2, Wei HX1,2.

Author information

1
College of Chemistry, Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou, Jiangsu 215009, P.R. China.
2
Jiangsu Key Laboratory of Environmental Functional Materials, Suzhou, Jiangsu 215009, P.R. China.
3
Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia.

Abstract

Two novel D-A bipolar blue phosphorescent host materials based on phenothiazine-5,5-dioxide: 3-(9H-carbazol-9-yl)-10-ethyl-10H-phenothiazine-5,5-dioxide (CEPDO) and 10-butyl-3-(9H-carbazol-9-yl)-10H-phenothiazine-5,5-dioxide (CBPDO) were synthesized and characterized. The photophysical, electrochemical and thermal properties were systematically investigated. CEPDO and CBPDO not only have a high triplet energy but also show a bipolar behavior. Moreover, their fluorescence emission peaks are in the blue fluorescence region at 408 nm and the fluorescence quantum efficiency (Φ) of CEPDO and CBPDO were 62.5% and 59.7%, respectively. Both CEPDO and CBPDO showed very high thermal stability with decomposition temperatures (Td) of 409 and 396 °C as well as suitable HOMO and LUMO energy levels. This preferable performance suggests that CEPDO and CBPDO are alternative bipolar host materials for the PhOLEDs.

KEYWORDS:

host materials; phenothiazine; phosphorescence; synthesis

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