In:
Angewandte Chemie, Wiley, Vol. 133, No. 15 ( 2021-04-06), p. 8516-8521
Abstract:
A spiro‐axis skeleton not only introduces circularly polarized luminescence (CPL) into thermally activated delayed fluorescence (TADF) molecules but also enhances the intramolecular through space charge transfer (TSCT) process. Spiral distributed phenoxazine and 2‐(trifluoromethyl)‐9 H ‐thioxanthen‐9‐one‐10,10‐dioxide act as donor and acceptor units, respectively. The resulting TADF enantiomers, ( rac )‐OSFSO, display emission maxima at 470 nm, small singlet‐triplet energy gap (Δ E ST ) of 0.022 eV and high photoluminescence quantum yield (PLQY) of 81.2 % in co‐doped film. The circularly polarized OLEDs (CP‐OLEDs) based on ( R )‐OSFSO and ( S )‐OSFSO display obvious circularly polarized electroluminescence (CPEL) signals with dissymmetry factor up to 3.0×10 −3 and maximum external quantum efficiency (EQE max ) of 20.0 %. Moreover, the devices show remarkably low efficiency roll‐off with an EQE of 19.3 % at 1000 cd m −2 (roll‐off ca. 3.5 %), which are among the top results of CP‐OLEDs.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v133.15
DOI:
10.1002/ange.202015411
Language:
English
Publisher:
Wiley
Publication Date:
2021
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