1. Two novel blue phosphorescent host materials containing phenothiazine-5,5-dioxide structure derivatives
- Author
-
Feng-Ming Xie, Qingdong Ou, Qiang Zhang, Jiang-Kun Zhang, Guo-Liang Dai, Xin Zhao, and Huai-Xin Wei
- Subjects
host materials ,phenothiazine ,phosphorescence ,synthesis ,Science ,Organic chemistry ,QD241-441 - 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.
- Published
- 2018
- Full Text
- View/download PDF