σ-Conjugation and H-Bond-Directed Supramolecular Self-Assembly: Key Features for Efficient Long-Lived Room Temperature Phosphorescent Organic Molecular Crystals
- 주제(키워드) hydrogen bonds , molecular crystals , organic room-temperature phosphorescence , supramolecular self-assembly , σ-conjugation
- 등재 SCIE, SCOPUS
- OA유형 Green Submitted
- 발행기관 Wiley-VCH Verlag
- 발행년도 2021
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000175642
- 본문언어 영어
- Published As http://dx.doi.org/10.1002/anie.202011770
- PubMed https://pubmed.ncbi.nlm.nih.gov/33089921
- 저작권 이화여자대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
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. © 2020 Wiley-VCH GmbH
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