期刊
ADVANCED MATERIALS
卷 34, 期 32, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202201778
关键词
cyano groups; multiple resonance effect; organic light-emitting diodes; pure green; thermally activated delayed fluorescence
类别
资金
- JSPS KAKENHI [20H05863, 21H02019, 21H05408]
- Asahi Glass Foundation
- Nagase Science and Technology Foundation
A pure green MR-TADF material (nu-DABNA-CN-Me) with high k(RISC) of 10(5) s(-1) is reported, achieved by introducing cyano groups into a blue-emitting MR-TADF material (nu-DABNA). The organic light-emitting diode employing it as an emitter exhibits green emission with a small full-width at half-maximum and a high maximum EQE of 31.9%.
Multiple resonance (MR)-effect-induced thermally activated delayed fluorescence (TADF) materials have garnered significant attention because they can achieve both high color purity and high external quantum efficiency (EQE). However, the reported green-emitting MR-TADF materials exhibit broader emission compared to those of blue-emitting ones and suffer from severe efficiency roll-off due to insufficient rate constants of reverse intersystem crossing process (k(RISC)). Herein, a pure green MR-TADF material (nu-DABNA-CN-Me) with high k(RISC) of 10(5) s(-1) is reported. The key to success is introduction of cyano groups into a blue-emitting MR-TADF material (nu-DABNA), which causes remarkable bathochromic shift without a loss of color purity. The organic light-emitting diode employing it as an emitter exhibits green emission at 504 nm with a small full-width at half-maximum of 23 nm, corresponding to Commission Internationale d'eclairage coordinates of (0.13, 0.65). The device achieves a high maximum EQE of 31.9% and successfully suppresses the efficiency roll-off at a high luminance.
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