Through-space interaction enables simultaneous enhancements of <i>k</i> _<i>r</i> and <i>k</i> _RISC in highly efficient spiro-acridine based thermally activated delayed fluorescence emitter with acridone acceptor.

ABSTRACT: Most of acridine based thermally activated delayed fluorescence (TADF) emitters are characterized by advantageous reverse intersystem crossing (RISC) rate (k _RISCs) due to the perpendicular orientation of the acridine donor to the acceptor moiety, but suffer from a poor radiation rate (k _r ) typically in the order of 10⁶ s^-1. Herein, two sky blue TADF emitters 3,6-DMAC-AD-Py and 3,6-SFAC-AD-Py were developed by linking acridine (DMAC) and spiro-fluorene-acridine (SFAC) donors to 10-(pyridin-2-yl)acridin-9(10H)-one (AD-Py) acceptor. Larger SFAC and electron-deficient pyridyl groups are deliberately incorporated in 3,6-SFAC-AD-Py since the unique through-space interaction between them is designed to drive the rotation of

SUBMITTER: Mei Y 

PROVIDER: S-EPMC12755221 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature