Wang J, Liang J, Xu Y, Liang B, Wei J, Li C, Mu X, Ye K, Wang Y. Purely Organic Phosphorescence Emitter-Based Efficient Electroluminescence Devices.
J Phys Chem Lett 2019;
10:5983-5988. [PMID:
31537062 DOI:
10.1021/acs.jpclett.9b02513]
[Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A pure organic molecule 2,6-di(phenothiazinyl)naphthalene (DPTZN) with room-temperature phosphorescence (RTP) features was developed. Remarkably, a triazine-benzimidazole-based molecule TRZ-BIM can significantly improve the RTP efficiency of DPTZN in DPTZN:TRZ-BIM blend films. The photoluminescence quantum yield (PLQY) of 10 wt % DPTZN:TRZ-BIM blend film is 38%. The RTP property of DPTZN:TRZ-BIM blend films was characterized by steady, time-resolved, and temperature-dependent emission spectra. An organic light-emitting diode (OLED) with 10 wt % DPTZN:TRZ-BIM blend film as the emitting layer showed a high maximum external quantum efficiency of 11.5%, current efficiency of 33.8 cd A-1, and power efficiency of 32.6 lm W-1. Herein, we have developed an efficient approach to achieve precious-metal-free organic films that can be employed to fabricate high-performance phosphorescence OLEDs.
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