Journal
DYES AND PIGMENTS
Volume 185, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2020.108894
Keywords
Spiro[fluorene-9,9 '-xanthene]; Electron acceptor; Thermally activated delayed fluorescence; Exciplex-emission; Organic light-emitting device
Funding
- National Natural Science Foundation of China [61605090, 21774061, 21602111, 91833306]
- Natural Science Foundation of Jiangsu Province [BK20190090, BK20180751]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) [YX030003]
- Open Project from State Key Laboratory of Supra-molecular Structure and Materials at Jilin University [sklssm202014]
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The research synthesized two new SFX-based acceptors and obtained devices with excellent exciplex-TADF performance using TCTA as a donor. The results showed that both devices displayed appealing efficiencies, with the TCTA:TRZSFX-based device achieving a maximum external quantum efficiency of 22.5%.
Exciplex-thermally activated delayed fluorescence (TADF) is significant due to its potential in energy-saving and flexible techniques, but still suffers from complicated-synthesis materials and low-efficiency devices. Herein, we synthesize two new spiro[fluorene-9,9'-xanthene] (SFX)-based acceptors, 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-SFX (TRZSFX) and 2,7-bis(4,6-diphenyl-1,3,5-triazin-2-yl)-SFX (DTRZSFX) via convenient method, and obtain exciplex-emitters using the tris(4-carbazoyl-9-ylphenyl)amine (TCTA) as a donor. The results suggest that two devices based on TCTA:TRZSFX and TCTA:DTRZSFX display excellent exciplex-TADF accompanied by appealing efficiencies of 79.6 cd A(-1) and 78.1 lm W-1. Encouragingly, a maximum value of 22.5% in external quantum efficiency (EQE) is realized for TCTA:TRZSFX-based device, which is higher than those of most reported exciplex OLEDs as far as we know. Our work offers a promising avenue for developing high-efficiency exciplex-emissions.
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