Modulatory spin-flip of triplet excitons <i>via</i> diversiform electron-donating units for MR-TADF emitters towards solution-processed narrowband OLEDs.

ABSTRACT: Multiple resonance thermally activated delayed fluorescence (MR-TADF) molecules are emerging as promising candidates for high-resolution organic light-emitting diode (OLED) displays, but MR-TADF emitters always suffer from an unsatisfactory rate constant of reverse intersystem crossing (k _RISC) due to inherently low spin orbital coupling strength between excited singlet and triplet states. Herein, we systematically investigate the long-range charge transfer (LRCT) and heavy-atom effects on modulating the excited state natures and energy levels via integrating diversiform electron-donating units with the MR skeleton. Compared with unsubstituted analogues, newly designed MR-TADF emitters exhibit significantly boosted k _RISC values and close-to-unity

SUBMITTER: Li S 

PROVIDER: S-EPMC11484990 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature