Issue 7, 2021

Highly efficient red thermally activated delayed fluorescence emitters by manipulating the molecular horizontal orientation

Abstract

Developing highly efficient red thermally activated delayed fluorescence (TADF) emitters remains a formidable challenge due to strict molecular design principles. In this contribution, two red emitters PXZ-AQPy and PXZ-AQPhPy with high structural rigidity and linear configurations are designed and synthesized based on phenoxazine (PXZ) as a donor and acenaphtho[1,2-b]quinoxaline (AQ) as an acceptor. Both molecules with horizontal orientation are endowed with TADF and aggregation-induced emission (AIE) properties. By elongating the acceptor segment via phenyl decoration, PXZ-AQPhPy exhibits higher horizontal ratios of the emitting dipole orientation (Θ‖ = 85%), while the emission characteristics are almost unaltered. Consequently, the PXZ-AQPhPy based device achieves a high external quantum efficiency of 19.6% with an emission peak at 610 nm. This work provides a simple and effective design strategy to selectively promote the horizontal orientation of red TADF emitters.

Graphical abstract: Highly efficient red thermally activated delayed fluorescence emitters by manipulating the molecular horizontal orientation

Supplementary files

Article information

Article type
Research Article
Submitted
29 Jan 2021
Accepted
28 Feb 2021
First published
01 Mar 2021

Mater. Chem. Front., 2021,5, 3209-3215

Highly efficient red thermally activated delayed fluorescence emitters by manipulating the molecular horizontal orientation

C. Zhou, C. Cao, D. Yang, X. Cao, H. Liu, D. Ma, C. Lee and C. Yang, Mater. Chem. Front., 2021, 5, 3209 DOI: 10.1039/D1QM00155H

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