A rigid donor unit strategy enables highly efficient narrowband blue multi-resonance thermally activated delayed fluorescence emitters.

ABSTRACT: Benzothienocarbazole (BTC) regioisomers, featuring a relatively heavy sulfur atom, a rigid molecular structure, and moderate electron-donating ability, are used in the design of TADF emitters. Here, a comprehensive structural and optoelectronic investigation of two narrowband blue MR-TADF emitters with rigid donor units is presented. A tert-butyldiphenylamine group at the para position of the boron atom gives these molecules a hybrid frontier molecular orbital distribution, showing both short-range charge transfer (SRCT) and long-range charge transfer (LRCT) traits. The rigid donor units not only diminish the high-frequency vibronic coupling strength of the commonly involved stretching modes but also lower the non-radiative decay rate constants of the triplet state. Consequen

SUBMITTER: Li D 

PROVIDER: S-EPMC12903768 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature