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Highly Efficient Electroluminescence from Narrowband Green Circularly Polarized Multiple Resonance Thermally Activated Delayed Fluorescence Enantiomers
Author(s) -
Xu Yincai,
Wang Qingyang,
Cai Xinliang,
Li Chenglong,
Wang Yue
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202100652
Subject(s) - electroluminescence , materials science , narrowband , oled , fluorescence , optoelectronics , diode , quantum efficiency , luminescence , phosphor , optics , physics , nanotechnology , layer (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 × 10 −3 /−1.27 × 10 −3 and +4.60 × 10 −4 /−4.76 × 10 −4 , respectively. This is the first example of a highly efficient OLED that exhibits CPEL signal, narrowband emission, and TADF concurrently.