Effect of Yb3+ on the Crystal Structural Modification and Photoluminescence Properties of GGAG:Ce3+

详细信息    查看全文

• 作者：Zhao-Hua Luo ; Yong-Fu Liu ; Chang-Hua Zhang ; Jian-Xin Zhang ; Hai-Ming Qin ; Hao-Chuan Jiang ; Jun Jiang
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：March 21, 2016
• 年：2016
• 卷：55
• 期：6
• 页码：3040-3046
• 全文大小：511K
• ISSN：1520-510X

文摘

Gadolinium gallium aluminum garnet (GGAG) is a very promising host for the highly efficient luminescence of Ce³⁺ and shows potential in radiation detection applications. However, the thermodynamically metastable structure would be slanted against it from getting high transparency. To stabilize the crystal structure of GGAG, Yb³⁺ ions were codoped at the Gd³⁺ site. It is found that the decomposition of garnet was suppressed and the transparency of GGAG ceramic was evidently improved. Moreover, the photoluminescence of GGAG:Ce³⁺,xYb³⁺ with different Yb³⁺ contents has been investigated. When the Ce³⁺ ions were excited under 475 nm, a typical near-infrared region emission of Yb³⁺ ions can be observed, where silicon solar cells have the strongest absorption. Basing on the lifetimes of Ce³⁺ ions in the GGAG:Ce³⁺,xYb³⁺ sample, the transfer efficiency from Ce³⁺ to Yb³⁺ and the theoretical internal quantum efficiency can be calculated and reach up to 86% and 186%, respectively. This would make GGAG:Ce³⁺,Yb³⁺ a potential attractive downconversion candidate for improving the energy conversion efficiency of crystalline silicon (c-Si) solar cells.