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Bluish-White Luminescence in Rare-Earth-Free Vanadate Garnet Phosphors: Structural Characterization of LiCa3MV3O12 (M = Zn and Mg)
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2017-12-28 00:00:00 , DOI: 10.1021/acs.inorgchem.7b02820 Takuya Hasegawa 1, 2 , Yusuke Abe 3 , Atsuya Koizumi 3 , Tadaharu Ueda 1, 2 , Kenji Toda 3 , Mineo Sato 4
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2017-12-28 00:00:00 , DOI: 10.1021/acs.inorgchem.7b02820 Takuya Hasegawa 1, 2 , Yusuke Abe 3 , Atsuya Koizumi 3 , Tadaharu Ueda 1, 2 , Kenji Toda 3 , Mineo Sato 4
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Extensive attention has been focused toward studies on inexpensive and rare-earth-free garnet-structure vanadate phosphors, which do not have a low optical absorption due to the luminescence color being easily controlled by its high composition flexibility. However, bluish emission phosphors with a high quantum efficiency have not been found until now. In this study, we successfully discovered bluish-white emitting, garnet structure-based LiCa3MV3O12 (M = Zn and Mg) phosphors with a high quantum efficiency, and the detailed crystal structure was refined by the Rietveld analysis technique. These phosphors exhibit a broad-band emission spectra peak at 481 nm under near UV-light excitation at 341 nm, indicating no clear difference in the emission and excitation spectra. A very compact tetrahedral [VO4] unit is observed in the LiCa3MV3O12 (M = Zn and Mg) phosphors, which is not seen in other conventional garnet compounds, and generates a bluish-white emission. In addition, these phosphors exhibit high quantum efficiencies of 40.1% (M = Zn) and 44.0% (M = Mg), respectively. Therefore, these vanadate garnet phosphors can provide a new blue color source for LED devices.
中文翻译：
无稀土钒酸盐石榴石荧光粉中的蓝白色发光：LiCa 3 MV 3 O 12（M = Zn和Mg）的结构表征
廉价的，无稀土的石榴石结构的钒酸盐磷光体的研究已引起广泛关注，由于发光颜色易于通过其高的组成柔韧性来控制，因此它们的光吸收不低。但是，迄今为止，尚未发现具有高量子效率的蓝色发光荧光体。在这项研究中，我们成功地发现了发出蓝白色，石榴石结构的LiCa 3 MV 3 O 12（M = Zn和Mg）荧光粉具有高量子效率，并且通过Rietveld分析技术精制了详细的晶体结构。这些荧光粉在341 nm的近紫外光激发下在481 nm处显示出宽带发射光谱峰，表明发射光谱和激发光谱没有明显差异。在LiCa 3 MV 3 O 12（M = Zn和Mg）磷光体中观察到非常紧凑的四面体[VO 4 ]单元，这在其他常规石榴石化合物中看不到，并发出蓝白色发射光。此外，这些磷光体分别具有40.1％（M = Zn）和44.0％（M = Mg）的高量子效率。因此，这些钒酸盐石榴石荧光粉可为LED器件提供新的蓝色光源。
更新日期：2017-12-28
中文翻译：
无稀土钒酸盐石榴石荧光粉中的蓝白色发光：LiCa 3 MV 3 O 12（M = Zn和Mg）的结构表征
廉价的，无稀土的石榴石结构的钒酸盐磷光体的研究已引起广泛关注，由于发光颜色易于通过其高的组成柔韧性来控制，因此它们的光吸收不低。但是，迄今为止，尚未发现具有高量子效率的蓝色发光荧光体。在这项研究中，我们成功地发现了发出蓝白色，石榴石结构的LiCa 3 MV 3 O 12（M = Zn和Mg）荧光粉具有高量子效率，并且通过Rietveld分析技术精制了详细的晶体结构。这些荧光粉在341 nm的近紫外光激发下在481 nm处显示出宽带发射光谱峰，表明发射光谱和激发光谱没有明显差异。在LiCa 3 MV 3 O 12（M = Zn和Mg）磷光体中观察到非常紧凑的四面体[VO 4 ]单元，这在其他常规石榴石化合物中看不到，并发出蓝白色发射光。此外，这些磷光体分别具有40.1％（M = Zn）和44.0％（M = Mg）的高量子效率。因此，这些钒酸盐石榴石荧光粉可为LED器件提供新的蓝色光源。
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