Observation of thermally activated intersystem crossing in room-temperature phosphorescence of weakly donor-acceptor-donor π-ternary molecules.

ABSTRACT: The direct observation of thermally activated intersystem crossing (TA-ISC) processes in room-temperature phosphorescence (RTP) has not been well investigated. Here, we reported four weakly donor-acceptor-donor π-ternary molecules featuring isomerism-dependent phosphorescence behaviors. The isomerism was modulated by changing the substitution position, offering tunable molecular planarity and π-conjugation. As a result, regulated energy levels and orbital configurations of the excited states facilitate additional TA-ISC channels as revealed by theoretical investigations. The temperature-dependent photoluminescence and fs- and ns-transient absorption spectra undoubtedly demonstrate their existence and effectiveness in promoting efficient and persistent RTP. The ISC rate constant achieves a

SUBMITTER: Huang W 

PROVIDER: S-EPMC12626031 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature