Issue 8, 2022

Distinguishing the respective determining factors for spectral broadening and concentration quenching in multiple resonance type TADF emitter systems

Abstract

Multiple resonance (MR) type thermally activated delayed fluorescence (TADF) emitters have attracted much recent attention due to their narrow emission spectra and high photoluminescence quantum yields (PLQYs). Spectral broadening and concentration quenching at high doping concentrations are two issues currently limiting the development of MR-TADF emitters. However, the origins of these have not been fully clarified so far. In this work, by investigating emitters with the same MR cores but peripheral groups of different steric types, we distinguished that the spectral broadening and concentration quenching are mainly caused by excimer formation and triplet exciton annihilation, respectively. This understanding on aggregated behaviors of MR emitters provides new insight for the further development of high-performance MR-TADF emitters with low concentration sensitivities.

Graphical abstract: Distinguishing the respective determining factors for spectral broadening and concentration quenching in multiple resonance type TADF emitter systems

Supplementary files

Article information

Article type
Communication
Submitted
26 Apr. 2022
Accepted
15 Jun. 2022
First published
16 Jun. 2022

Mater. Horiz., 2022,9, 2226-2232

Distinguishing the respective determining factors for spectral broadening and concentration quenching in multiple resonance type TADF emitter systems

F. Huang, X. Fan, Y. Cheng, H. Wu, Y. Shi, J. Yu, K. Wang, C. Lee and X. Zhang, Mater. Horiz., 2022, 9, 2226 DOI: 10.1039/D2MH00511E

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