期刊
ADVANCED MATERIALS
卷 33, 期 21, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202100652
关键词
circularly polarized luminescence; multiple resonance; narrowband emission; organic light‐ emitting diodes; thermally activated delayed fluorescence
类别
资金
- National Natural Science Foundation of China [21935005]
- National Key R&D Program of China [2020YFA0714601]
- Program for JLU Science and Technology Innovative Research Team [2019TD-33]
In this study, highly efficient organic light-emitting diodes that exhibit pure green emission and circularly polarized electroluminescence signal were developed by integrating circularly polarized luminescence and thermally activated delayed fluorescence emission induced by multiple resonance effect. This represents a significant advancement in the field of organic electronics.
Purely organic fluorescent materials that concurrently exhibit high efficiency, narrowband emission, and circularly polarized luminescence (CPL) remain an unaddressed issue despite their promising applications in wide color gamut- and 3D-display. Herein, the CPL optical property and multiple resonance (MR) effect induced thermally activated delayed fluorescence (MR-TADF) emission are integrated with high color purity and luminous efficiency together. Two pairs of highly efficient green CP-MR-TADF enantiomers, namely, (R/S)-OBN-2CN-BN and (R/S)-OBN-4CN-BN, are developed. The enantiomer-based organic light-emitting diodes (OLEDs) exhibit pure green emission with narrow full-width at half-maximums (FWHMs) of 30 and 33 nm, high maximum external quantum efficiencies (EQEs) of 29.4% and 24.5%, and clear circularly polarized electroluminescence (CPEL) signals with electroluminescence dissymmetry factors (g(EL)) of +1.43 x 10(-3)/-1.27 x 10(-3) and +4.60 x 10(-4)/-4.76 x 10(-4), respectively. This is the first example of a highly efficient OLED that exhibits CPEL signal, narrowband emission, and TADF concurrently.
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