Direct population of triplet excited states through singlet-triplet transition for visible-light excitable organic afterglow.

ABSTRACT: Invoking efficient afterglow in metal-free organic molecules represents an important material advancement. However, organic afterglow suffers from low intensity and efficiency and generally needs to be excited by UV light owing to its spin-forbidden phosphorescent nature that essentially requires facile intersystem crossing (ISC). Here, we propose a strategy to bypass the traditional ISC through facilitating singlet-triplet transition to directly populate triplet excited states from the ground state by combining synergetic effects of both heavy/hetero-atom incorporation and aromatic aggregation. Verified by systematic experimental and computational investigations, this unique singlet-to-triplet absorption results in a much improved organic afterglow quantum efficiency up to 9.5% with a pro

SUBMITTER: Yuan J 

PROVIDER: S-EPMC6530535 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature