Phosphorylation amplified asymmetry of spiro[acridine-9,9′-xanthene] hosts for efficient blue and white thermal activated delay fluorescent diodes

Abstract

“Molecular asymmetry” for spiro host development led to synergy between functional group and asymmetric core in electronic and steric effects, rendering ∼100% photoluminescence quantum yield and top-rank efficiencies of 69.3 lm W−1 and 22.9% from the single-emissive-lay TADF WOLEDs.