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Abstract In this study, we report the first circularly polarized white organic light‐emitting diodes (CP‐WOLEDs) based on all thermally activated delayed fluorescence (TADF) materials. Two pairs of spiro‐type TADF enantiomers, ( R / S )‐SPOCN (5,5′‐((2,2′,3,3′‐tetrahydro‐1,1′‐spirobiindene‐7,7′‐diyl)bis(oxy))bis(4‐(10 H ‐phenoxazin‐10‐yl)phthalonitrile)) and ( R / S )‐OSFSO (2′‐(trifluoromethyl)‐spiroquinolino[3,2,1‐ kl phenoxazine‐9,9′‐thioxanthene]‐10′,10′‐dioxide), serve as emitters with complementary emission. The CP‐OLEDs exhibit warm white emission with a CIE coordinate of (0.35, 0.46). Besides, decent device performances are observed with an external quantum efficiency of up to 21.6 % at maximum and 11.8 % at 1000 cd m −2 . Obvious circularly polarized electroluminescence signals are detected with a dissymmetry factor | g EL | of around 3.0×10 −3 . This is the first report of CP‐WOLEDs that can harvest both singlet and triplet excitons, which provides a feasible strategy for the development of CP‐WOLEDs with remarkable device performances.
Zhang et al. (Thu,) studied this question.