Luminescence Property and Energy Transfer from Sm<SUP>3+</SUP> ion to Eu<SUP>3+</SUP> ion in LiEu<SUB>x</SUB>Sm<SUB> (1-x) </SUB>W<SUB>2</SUB>O<SUB>8</SUB> solid solution
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概要
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For the improvement of excitation properties as a phosphor for UV-LED, LiEuW<SUB>2</SUB>O<SUB>8</SUB> doped with some rare earth ions was prepared using solid-state reaction, and its luminescence property was investigated. The synthesized phosphors had a sharp emitting peak at 614 nm due to <SUP>5</SUP>D<SUB>0</SUB>→<SUP>7</SUP>F<SUB>2</SUB> transition. Novel excitation bands appeared around 403 nm by substitution of Sm<SUP>3+</SUP> ion for Eu<SUP>3+</SUP> ion site in LiEuW<SUB>2</SUB>O<SUB>8</SUB>. It was showed that the energy transfer occurred from Sm<SUP>3+</SUP> ion to Eu<SUP>3+</SUP> ion, because the novel excitation band position fitted energy level of Sm<SUP>3+</SUP> ion. The most suitable amount of substituted Sm<SUP>3+</SUP> ion was 4mol% in this work. Under 400nm excitation, which gave the most external quantum efficiency for GaN LED, emission peak intensity of the products was increased. It was clear that the emission peak intensity of product was more than 6times of that of the industrial product Y<SUB>2</SUB>O<SUB>2</SUB>S : Eu<SUP>3+</SUP>. Moreover, white light emission with high luminance was observed by mixture of RGB phosphors.
- Japan Society of Colour Materialの論文