Chiral Arylene Diimide Phosphors: Circularly Polarized Ambient Phosphorescence from Bischromophoric Pyromellitic Diimides
Swadhin Garain, Souvik Sarkar, Bidhan Chandra Garain, Swapan K. Pati, Subi J. George
Abstract
Abstract Chiral organic phosphors with circularly polarized room‐temperature phosphorescence (CPP) provide new prospects to the realm of circularly polarized luminescence (CPL) materials, owing to the long‐lived triplet states and persistent emission. Although several molecular designs show efficient room‐temperature phosphorescence (RTP), realization of ambient organic CPP remains a formidable challenge. Herein, we introduce a chiral bischromophoric phosphor design to realize ambient CPP emission by appending molecular phosphors to a chiral diaminocyclohexane core. Thus, solution‐processable polymer films of the trans ‐1,2‐diaminocyclohexane (DAC) chiral cores with heavy‐atom substituted pyromellitic diimide phosphors, exhibits one of the most efficient exclusive CPP emissions with high phosphorescence quantum yield (≈18 % in air and ≈46 % under vacuum) and significant luminescence dissymmetry factor (| g lum |≈4.0×10 −3 ).