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- W2517506912 abstract "When a diameter of doped semiconductor phosphor goes down to less than Bohr diameter, its quantum efficiency of luminescence becomes larger than that of a conventional bulk material. This issue has been comprehensively studied since Bhargava's report appeared in 1994. Nanosizing enhances interaction between a host and a dopant to induce effective energy transfer. Surface modification of nanosize phosphors plays significant roles in capping of surface luminescent killers and the confinement of electron-hole pairs inside a nanoparticle. We have studied the photoluminescence properties of Mn2+-doped ZnS (ZnS:Mn) nanocrystal phosphors modified by organic compounds with functional groups, such as carboxyl and phosphoric groups. Since functional groups are simultaneously excited with ZnS, we focus on energy transfer from functional groups to Mn2+ ions as well as the above-mentioned effects. Electron paramagnetic resonance spectroscopy reveals a near-surface Mn2+ site with a lower symmetry, which is characteristic of nanocrystal. This lower symmetry explains the higher probability of d-d transition of Mn2+ ions as well as stronger interaction between Mn2+ and ZnS and between Mn2+ and functional groups, as compared to an inside Mn2+ site. Here I introduce our recent works on organic/inorganic hybrid ZnS:Mn nanocrystal phosphors." @default.
- W2517506912 created "2016-09-16" @default.
- W2517506912 creator A5020114499 @default.
- W2517506912 date "2001-01-01" @default.
- W2517506912 modified "2023-09-26" @default.
- W2517506912 title "Photoluminescence and Local Structure of Organic/Inorganic Hybrid ZnS: Mn Nanocrystal Phosphors." @default.
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- W2517506912 doi "https://doi.org/10.1380/jsssj.22.315" @default.
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