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σ‐Conjugation and H‐Bond‐Directed Supramolecular Self‐Assembly: Key Features for Efficient Long‐Lived Room Temperature Phosphorescent Organic Molecular Crystals
Author(s) -
Demangeat Catherine,
Dou Yixuan,
Hu Bin,
Bretonnière Yann,
Andraud Chantal,
D'Aléo Anthony,
Wu Jeong Weon,
Kim Eunkyoung,
Le Bahers Tangui,
Attias AndréJean
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202011770
Subject(s) - phosphorescence , chromophore , supramolecular chemistry , intermolecular force , conjugated system , phosphor , luminescence , materials science , crystal engineering , self assembly , crystal (programming language) , molecule , supramolecular assembly , crystallography , photochemistry , crystal structure , chemistry , nanotechnology , fluorescence , polymer , optoelectronics , organic chemistry , optics , computer science , composite material , physics , programming language
Long‐lived room temperature phosphorescence from organic molecular crystals attracts great attention. Persistent luminescence depends on the electronic properties of the molecular components, mainly π‐conjugated donor–acceptor (D‐A) chromophores, and their molecular packing. Here, a strategy is developed by designing two isomeric molecular phosphors incorporating and combining a bridge for σ‐conjugation between the D and A units and a structure‐directing unit for H‐bond‐directed supramolecular self‐assembly. Calculations highlight the critical role played by the two degrees of freedom of the σ‐conjugated bridge on the chromophore optical properties. The molecular crystals exhibit RTP quantum yields up to 20 % and lifetimes up to 520 ms. The crystal structures of the efficient phosphorescent materials establish the existence of an unprecedented well‐organization of the emitters into 2D rectangular columnar‐like supramolecular structure stabilized by intermolecular H‐bonding.