In:
Journal of Materials Chemistry C, Royal Society of Chemistry (RSC), Vol. 11, No. 18 ( 2023), p. 6018-6025
Abstract:
Thermally activated delayed fluorescence (TADF) emitters with a high horizontal emitting dipole ratio ( Θ ‖ ) remain a hot spot in the application of organic light-emitting diodes (OLEDs), which may achieve an extremely high external quantum efficiency (EQE). Herein, two yellow TADF emitters, 3,6,11-triTPA-BPQ and 3,6,12-triTPA-BPQ based on the triphenylamine (TPA) donor, have been synthesized by reasonably introducing nitrogen atoms into different positions of the acceptor core. Both emitters exhibit high horizontal emitting dipole ratios of 92% in doped organic films with photoluminescence quantum yields ( Φ PL ) of 94.0% and 78.4%, respectively. Because of high Φ PL and high light out-coupling ratio induced by high Θ ‖ for 3,6,11-triTPA-BPQ, yellow OLEDs using this emitter achieve a maximum external quantum efficiency of 30.3%, which provides a novel way to boost the efficiency of yellow TADF-OLEDs.
Type of Medium:
Online Resource
ISSN:
2050-7526
,
2050-7534
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2702245-6
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