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Arylene Diimide Phosphors: Aggregation Modulated Twin Room Temperature Phosphorescence from Pyromellitic Diimides
Author(s) -
Garain Swadhin,
Kuila Suman,
Garain Bidhan Chandra,
Kataria Meenal,
Borah Aditya,
Pati Swapan K.,
George Subi J.
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202101538
Subject(s) - phosphorescence , diimide , photochemistry , phosphor , cyan , chemistry , arylene , quantum yield , materials science , organic chemistry , molecule , fluorescence , alkyl , optoelectronics , perylene , art , physics , quantum mechanics , aryl , visual arts
Arylene diimide derived ambient organic phosphors are seldom reported despite their potential structural characteristics to facilitate the triplet harvesting. In this context, highly efficient room temperature phosphorescence (RTP) from simple, heavy‐atom substituted pyromellitic diimide derivatives in amorphous matrix and crystalline state is reported here. Multiple intermolecular halogen bonding interactions among these phosphors, such as halogen‐carbonyl and halogen‐π resulted in the modulation of phosphorescence, cyan emission from monomeric state and orange‐red emission from its aggregated state, to yield twin RTP emission. Remarkably, the air‐stable phosphorescence presented here own one of the highest quantum yield (≈48 %) among various organics in orange‐red emissive region.