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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.

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


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.


host materials; phenothiazine; phosphorescence; synthesis

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