Investigation of the Structural and Luminescent Properties and the Chromium Ion Valence of Li2CaGeO4 Crystals Doped with Cr4+ Ions

被引：16

作者：

Wang, Dongmei ^{[1
,2
]}

Zhang, Xiaowei ^{[1
]}

Wang, Xinyu ^{[1
]}

Leng, Zhuang ^{[1
]}

Yang, Qianqian ^{[1
]}

Ji, Wen ^{[1
]}

Lin, Hai ^{[1
,3
]}

Zeng, Fanming ^{[1
,3
]}

Li, Chun ^{[1
,3
]}

Su, Zhongmin ^{[1
,3
]}

机构：

[1] Changchun Univ Sci & Technol, Sch Mat Sci & Engn, Changchun 130022, Peoples R China

[2] Changchun Polytech, Changchun 130033, Peoples R China

[3] Jilin Prov Sci & Technol Innovat Ctr Opt Mat & Ch, Changchun 130022, Peoples R China

来源：

CRYSTALS | 2020年 / 10卷 / 11期

关键词：

Cr4+– Li2CaGeO4; crystal growth; NIR luminescence property; XPS; ENERGY-TRANSFER; PHOTOLUMINESCENCE PROPERTIES; SPECTROSCOPIC PROPERTIES; LASER; RAMAN; GROWTH; PERFORMANCE; XPS; ABSORPTION; EMISSION;

D O I：

10.3390/cryst10111019

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Herein, we report on the growth of Cr4+-Li2CaGeO4 crystals by the flux growth method from the flux of LiCl, as well as on the effect of doping Li2CaGeO4 with Cr4+ ions on the NIR region spectral properties and crystal structure. The results quantified the occupancy of Cr4+ in Ge4+ sites. The emission spectrum presented broad bands in the NIR region, i.e., 1000-1500 nm excited by 980 nm, with maximum peaks at 1200 nm at room temperature caused by the transition of T-3(2)->(3)A(2) in Cr4+ ions. The lifetime decreased with the Cr4+ ion doping concentration, specifically from 14.038 to 12.224 ms. The chemical composition and the valence state of chromium in Li2CaGeO4 were analyzed using X-ray photoelectron spectroscopy, which showed that the chromium in Li2CaGeO4 was tetravalent and no trivalent chromium was found. Therefore, the Cr4+-Li2CaGeO4 crystal has a great potential and future in optical applications.

引用

页码：1 / 15

页数：15

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