首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Multiwavelength excited novel red-emitting phosphor Eu~(3+)-activated Li_2Zn_2(MoO_4)_3
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Multiwavelength excited novel red-emitting phosphor Eu~(3+)-activated Li_2Zn_2(MoO_4)_3

机译:多波长激发新型发红光荧光粉Eu〜(3+)活化Li_2Zn_2(MoO_4)_3

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摘要

Eu~(3+)-activated Li_2Zn_2(MoO_4)_3 multiwavelength excited red-emitting phosphors were synthesized via a solid state reaction. The structure and photoluminescence characteristics were investigated by X-ray powder diffraction and fluorescent spectrophotometry, respectively. The excitation spectrum included a strong broadband ranging from 250 to 350 nm and some sharp peaks at 363,384,395,465, and 533 nm, which matchs the radiations of near-UV or blue light-emitting diodes chip well. Upon excitation either of near-UV or blue even green light, the intense red emission with 615 nm peak can be observed, which is ascribed to the ~5D_0-~7F_2 transition of Eu~(3+) ions. The chromaticity coordinates (x = 0.65, y = 0.34) of the as-obtained phosphor is very close to the National Television Standard Committee standard values (x=0.67, y= 0.33). All these characteristics suggest that Eu~(3+)-doped Li_2Zn_2(MoO_4)_3 wavelength-conversion material to be suitable candidate red component for phosphor-converted white light-emitting diodes.
机译:通过固相反应合成了Eu〜(3+)活化的Li_2Zn_2(MoO_4)_3多波长激发红色荧光粉。通过X射线粉末衍射和荧光分光光度法分别研究了结构和光致发光特性。激发光谱包括在250至350 nm范围内的强宽带,以及在363,384,395,465和533 nm处的一些尖峰,与近紫外或蓝色发光二极管芯片的辐射非常匹配。在激发近紫外光或蓝光甚至绿光后,可以观察到具有615 nm峰值的强烈红色发射,这归因于Eu〜(3+)离子的〜5D_0-〜7F_2跃迁。所获得的磷光体的色度坐标(x = 0.65,y = 0.34)非常接近国家电视标准委员会的标准值(x = 0.67,y = 0.33)。所有这些特征表明,掺Eu〜(3+)的Li_2Zn_2(MoO_4)_3波长转换材料是磷光转换白光发光二极管的合适候选红色成分。

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