期刊
DYES AND PIGMENTS
卷 207, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2022.110727
关键词
PhOLEDs; Bipolar host; Carbazole; Triazine; Efficiency roll -off
资金
- NSFC/China [21788102, 21790361]
- Shanghai Municipal Science and Technology Major Project [2018SHZDZX03]
- Fundamental Research Funds for the Central Universities
- Key R&D program of Shanxi Province (INTERNATIONAL COOPERATION) [201903D421087]
- Program for the Innovative Talents of Higher Education Institutions of Shanxi
- Key Research and Development Program of High-Level Scientific and Technological Talents in Lvliang City [2021RC-2-18]
Two new bipolar host materials with excellent thermal stability and appropriate triplet energy levels were synthesized, and they were used to fabricate green PhOLEDs with good performance and extremely small efficiency rolloff.
In this paper, two new bipolar host materials (CZ-p-TRZ and CZ-m-TRZ) which consist of 9-phenylcarbazole as the donor and 2,4,6-triphenyl-1,3,5-triazine as the acceptor were synthesized and characterized. Two compounds exhibit excellent thermal stability and appropriate triplet energy levels (ET). Based on the above advantages, Ir (ppy)3-based green phosphorescent organic light-emitting diodes (PhOLEDs) were fabricated with CZ-p-TRZ and CZ-m-TRZ as host. Both PhOLEDs show good performance with maximum external quantum efficiencies (EQEmax) of 16.83 and 19.40%, respectively. Especially, two devices also exhibit extremely small efficiency rolloff, and at a practical luminance of 1000 cd/m2, only 0.1% drop in efficiency was observed for two devices, which is among the best results ever reported as green bipolar hosts.
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