Ultralong room-temperature phosphorescence remarkably weakened by halogenation-induced molecular packing in hexaphenylmelamine derivatives

Autor:	Xiaoyu Li, Jie Li, Shi-Jian Su, Danyang Wan, Mengke Li, Qiang Guo, Li Tao, Shiyi Zhou
Rok vydání:	2021
Předmět:	Chemistry Materials Chemistry Metals and Alloys Ceramics and Composites Halogenation General Chemistry Photochemistry Phosphorescence Catalysis Surfaces Coatings and Films Electronic Optical and Magnetic Materials
Zdroj:	Chemical Communications. 57:6177-6180
ISSN:	1364-548X 1359-7345
DOI:	10.1039/d1cc01533h
Popis:	A series of pure organic halogenated hexaphenylmelamine (HPM) derivatives featuring remarkably weakened ultralong room-temperature phosphorescence (RTP) were meticulously investigated. As the p-substituted atoms of these HPM derivatives sequentially changed from H to F, Cl and Br, both the RTP lifetimes and efficiencies dramatically decreased from 608 ms with 13.4% (HPM-H) to 337 ms with 5.3% (HPM-F), 99 ms with 1.3% (HPM-Cl), and 2.8 ms with undetectable efficiency (HPM-Br), respectively. Most notably, the severely weakened efficiencies are fundamentally different from the trends of the effect of halogenation on phosphorescence properties previously reported. Coupled with experimental results and theoretical simulations, the subtle change of molecular packing induced by halogenation should be responsible for the distinctive RTP properties. This finding not only provides a unique halogen-involved RTP phenomenon, but also offers a very special perspective to understand the effect of halogenation on phosphorescence.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1a3a1eb57646aaa414bc8dd44214935c https://doi.org/10.1039/d1cc01533h Zobrazit plný text záznamu