Simultaneous delayed fluorescence and phosphorescence in organic luminescent material employing multiple excited states.

ABSTRACT: Triplet dynamics play a key role in room temperature phosphorescence (RTP) and thermally activated delayed fluorescence (TADF). In this work, we report a model emitter with three emission components: prompt fluorescence (PF) in nanoseconds, delayed fluorescence in microseconds, and RTP in milliseconds, with the emission spectrum ranging from ultraviolet to deep blue. We experimentally and theoretically verify that a second triplet excited state, T₂, below the singlet state S₁ is involved in facilitating simultaneous PF, TADF, and RTP in the model emitter. The reverse intersystem crossing (rISC) from T₂ to S₁ contributes to the TADF, while the radiative transition from T₁ to the ground state is the origin of the long-lived RTP. By trans

SUBMITTER: Dou D 

PROVIDER: S-EPMC12756230 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature