Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 5, Pages 2446-2454Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202011770
Keywords
hydrogen bonds; molecular crystals; organic room-temperature phosphorescence; supramolecular self-assembly; σ -conjugation
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Funding
- Asian Office of Aerospace Research and Development (AOARD) [FA 2386-17-1-4060]
- AXELERA Pele de Competitivite
- NRF [2017R1E1A1A01075394, 2014M3A6B3063708]
- SYSPROD project
- National Research Foundation of Korea [2017R1E1A1A01075394] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Long-lived room temperature phosphorescence from organic molecular crystals is achieved by designing two isomeric molecular phosphors, highlighting the critical role of the two degrees of freedom of the sigma-conjugated bridge on the chromophore optical properties. The crystal structures of the efficient phosphorescent materials demonstrate an unprecedented well-organization of the emitters into a 2D rectangular columnar-like supramolecular structure stabilized by intermolecular H-bonding.
Long-lived room temperature phosphorescence from organic molecular crystals attracts great attention. Persistent luminescence depends on the electronic properties of the molecular components, mainly pi-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 sigma-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 sigma-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.
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