Tuning the Excited State Character of Amine/Carbonyl Thermally Activated Delayed Fluorescence Emitters with Ring Fusion.

ABSTRACT: Multiple resonance thermally activated delayed fluorescence (MR-TADF) emitters exhibit short-range charge transfer (SRCT) and have narrow emission, whereas donor-acceptor TADF emitters show long-range charge transfer (LRCT) and rapid reverse intersystem crossing (RISC). While some work has been done to create intermediate-type materials with narrow emission and rapid RISC simultaneously, no studies of structurally comparable donor-acceptor versus MR-TADF systems have been described. Here we report two TADF emitters, Acr-DiKTa and Iso-DiDiKTa, to examine the effect of ring fusion on LRCT and SRCT character. Acr-DiKTa appends an acridone moiety to quinolino[3,2,1-de]acridine-5,9-dione to create a donor-acceptor-type structure, while a carbonyl bridge fuses these moieties in Iso-DiDiKTa to gi

SUBMITTER: Kalab T 

PROVIDER: S-EPMC12648455 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature