Boosting external quantum efficiency to 38.6% of sky-blue delayed fluorescence molecules by optimizing horizontal dipole orientation.

ABSTRACT: To achieve high electroluminescence efficiency, great efforts are devoted to enhancing photoluminescence quantum yield (Φ_PL) and exciton utilization of luminescent molecule, while another important factor, light out-coupling efficiency (η_out), receives less attention in molecule design. Here, we focus on horizontal dipole orientation engineering of the molecule to increase η_out and external quantum efficiency (η_ext). A series of tailor-made luminescent molecules consisting of an electron-accepting carbonyl core plus double electron-donating groups of spiro[acridine-9,9′-fluorene] and carbazole derivatives [e.g., 1,3,5-tri(carbazol-9-yl)benzene] are developed and systematically investigated. These molecules hold distinguished merits of strong sky-

SUBMITTER: Fu Y 

PROVIDER: S-EPMC8528420 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature