Switching between TADF and RTP: anion-regulated photoluminescence in organic salts and co-crystals.

ABSTRACT: Thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP) are two photophysical phenomena which utilize triplet excitons. In this work, we demonstrate how variation of the anion in organic salts with carbazole and phenothiazine-5,5-dioxide donors and pyridinium and quinolinium acceptors may be used to switch between TADF and RTP. These compounds adopt similar molecular structures and packing modes with different anions and exhibit different types of photophysical behavior due to the electronic effects of the anions. With bromide anions, the salts exhibit TADF with some RTP. These compounds show fast reverse intersystem crossing and a short delayed lifetime, which is key to application in efficient and robust OLEDs. With BF₄ ^- and PF

SUBMITTER: Xu Z 

PROVIDER: S-EPMC8406714 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature