High thermal-stability benzocarbazole derivatives as bipolar host materials for phosphorescent organic light-emitting diodes

• Published in: Dyes and pigments Vol. 123; pp. 196 - 203
• Main Authors: Chen, Yi, Liang, Wenqing, Choi, Wing Hong, Huang, Jinhai, Dong, Qingchen, Zhu, Furong, Su, Jianhua
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2015
• Subjects: Benzocarbazole derivatives; Bipolar; Green phosphorescent OLEDs; High thermal stability; Host materials; Low turn-on voltages; Low turn-on voltages; Bipolar; Host materials; High thermal stability; Benzocarbazole derivatives; Green phosphorescent OLEDs
• ISSN: 0143-7208; 1873-3743
• DOI: 10.1016/j.dyepig.2015.07.040

Two novel host materials based on 5- and 9-substituted benzocarbazole have been developed for application in phosphorescent organic light-emitting diodes. Both host materials exhibit excellent thermal stability with high decomposition temperatures of ca.515 °C, while the 9-substituted benzocarbazole derivative exhibits a high glass transition temperature of 181 °C. Additionally, the electroluminescence characteristics of green phosphorescent organic light-emitting diodes made with two new host materials were also evaluated. The devices exhibited an electroluminescent emission peak at 528 nm with CIE coordinates of (0.31, 0.64) and possessed low turn-on voltages of <2.84 V. [Display omitted] •5- and 9-substituted benzocarbazole-based new host materials were developed.•The 9-substituted benzocarbazole compound exhibits a high glass transition temperature of 181 °C.•Phosphorescent organic light-emitting diodes with the two host materials possess a low turn-on voltage of <2.84 V.