Chiral Selenium-Integrated Multi-Resonant Thermally Activated Delayed Fluorescent Emitters Showing Improved Reverse Intersystem Crossing Rate.

ABSTRACT: Nitrogen/carbonyl (N/C═O) based multi-resonant thermally activated delayed fluorescence (MR-TADF) emitters are attractive due to their bright, narrowband emission and the ease with which they can be synthesized. However, their photophysics typically suffer from slow reverse intersystem crossing (RISC) because of their relatively large singlet-triplet energy gap (ΔE_ST). Thus, the organic light-emitting diodes (OLEDs) with these emitters typically show severe efficiency roll-off. Here, two MR-TADF emitters DiKTaSe and tBuCz-DiKTaSe have been designed and synthesized. The introduction of selenium in the form of an annelated benzoselenophene enhances spin-orbit coupling and increases the RISC rate. The twisted ortho-substituted tert-butylcarbazole moiety in tBuCz-DiKTaSe helps to su

SUBMITTER: Wang J 

PROVIDER: S-EPMC12338389 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature