Abstract
Developing highly efficient red thermally activated delayed fluorescence (TADF) emitter 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 configuration are designed and synthesized based on phenoxazine (PXZ) as donor and acenaphtho[1,2-b]quinoxaline (AQ) as 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 emitting dipole orientation (Θ|| = 85%), while the emission characteristics are almost unaltered. Consequently, PXZ-AQPhPy based device achieves a high external quantum efficiency of 19.6 % with emission peak at 610 nm. This work provides a simple and effective design strategy to selectively promote the horizontal orientation of red TADF emitters.
| Original language | English |
|---|---|
| Pages (from-to) | 3209-3215 |
| Journal | Materials Chemistry Frontiers |
| Volume | 5 |
| Issue number | 7 |
| Online published | 1 Mar 2021 |
| DOIs | |
| Publication status | Published - 7 Apr 2021 |
Publisher's Copyright Statement
- COPYRIGHT TERMS OF DEPOSITED POSTPRINT FILE: This journal is © The Partner Organisations 2021. This is the accepted version of a paper published in Materials Chemistry Frontiers. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination. Zhou, C., Cao, C., Yang, D., Cao, X., Liu, H., Ma, D., Lee, C. S., & Yang, C. (2021). Highly Efficient Red Thermally Activated Delayed Fluorescence Emitters by Manipulating Molecular Horizontal Orientation. Materials Chemistry Frontiers, 5(7), 3209-3215. https://doi.org/10.1039/d1qm00155h