Premium
Crystal Engineering of Room Temperature Phosphorescence in Organic Solids
Author(s) -
Hamzehpoor Ehsan,
Perepichka Dmitrii F.
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201913393
Subject(s) - phosphorescence , steric effects , quenching (fluorescence) , quantum yield , phosphor , photochemistry , singlet state , crystal (programming language) , crystal engineering , luminescence , triplet state , chemistry , yield (engineering) , solid state , materials science , crystal structure , molecule , crystallography , fluorescence , optoelectronics , excited state , organic chemistry , atomic physics , physics , supramolecular chemistry , quantum mechanics , computer science , programming language , metallurgy
We report a series of highly emissive azatriangulenetrione (TANGO) solids in which the luminescent properties are controlled by engineering the molecular packing by adjusting the steric size of substituents. The co‐alignment of “phosphorogenic” carbonyl groups within the π‐stacks results in an almost pure triplet emission in HTANGO, TCTANGO, TBTANGO and TITANGO, while their rotation by ≈60° in the sterically hindered t BuTANGO leads to an almost pure singlet emission. Despite strong π‐interactions, aggregation‐induced quenching and triplet–triplet annihilation are avoided in HTANGO and TCTANGO which display efficient phosphorescence in the solid state. To our knowledge, HTANGO with the solid‐state phosphorescence quantum yield of 42 % at room temperature is the most efficient phosphor composed of the 1 st /2 nd raw elements only.