Arylene Diimide Phosphors: Aggregation Modulated Twin Room Temperature Phosphorescence from Pyromellitic Diimides

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...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2021-05, Vol.60 (22), p.12323-12327
Main Authors: Garain, Swadhin, Kuila, Suman, Garain, Bidhan Chandra, Kataria, Meenal, Borah, Aditya, Pati, Swapan K., George, Subi J.
Format: Article
Language:English
Subjects:
aggregation
Carbonyl compounds
Carbonyls
Diimide
dual phosphorescence
Emissions
noncovalent interactions
Phosphorescence
Phosphors
photochemistry
pyromellitic diimide
Room temperature
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Summary: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. Highly efficient room‐temperature phosphorescence, stable in air, from the simplest class of arylene diimides, i.e., pyromellitic diimides, is achieved. Aggregation modulated, colour tuneable phosphorescence emission from cyan to orange‐red in amorphous film and crystalline state is observed. The role of molecular design and weak intermolecular interactions in the observed properties is explained.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202101538