In:
Angewandte Chemie International Edition, Wiley, Vol. 58, No. 41 ( 2019-10-07), p. 14660-14665
Kurzfassung:
Developing red thermally activated delayed fluorescence (TADF) emitters, attainable for both high‐efficient red organic light‐emitting diodes (OLEDs) and non‐doped deep red/near‐infrared (NIR) OLEDs, is challenging. Now, two red emitters, BPPZ‐PXZ and mDPBPZ‐PXZ, with twisted donor–acceptor structures were designed and synthesized to study molecular design strategies of high‐efficiency red TADF emitters. BPPZ‐PXZ employs the strictest molecular restrictions to suppress energy loss and realizes red emission with a photoluminescence quantum yield ( Φ PL ) of 100±0.8 % and external quantum efficiency (EQE) of 25.2 % in a doped OLED. Its non‐doped OLED has an EQE of 2.5 % owing to unavoidable intermolecular π–π interactions. mDPBPZ‐PXZ releases two pyridine substituents from its fused acceptor moiety. Although mDPBPZ‐PXZ realizes a lower EQE of 21.7 % in the doped OLED, its non‐doped device shows a superior EQE of 5.2 % with a deep red/NIR emission at peak of 680 nm.
Materialart:
Online-Ressource
ISSN:
1433-7851
,
1521-3773
DOI:
10.1002/anie.201906575
Sprache:
Englisch
Verlag:
Wiley
Publikationsdatum:
2019
ZDB Id:
2011836-3
ZDB Id:
123227-7