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Inducing tunable host luminescence in Zn2GeO4 tetrahedral materials via doping Cr3
Qiongyu Bai1, Panlai Li2, Zhijun Wang2
1Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University), Ministry of Education, Beijing 100044,China; Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing 100044,China.
Abstract:
Zn2GeO4 consisting of tetrahedron, and it is a self-luminescent material due to the presence of the native defects and shows a bluish white emission excited by ultraviolet. Although Cr3+ doped in a tetrahedron generally cannot show luminescence, in this research, new defects are formed as Cr3+ doped in Zn2GeO4, hence a green emission band can be obtained. Meanwhile, the intensity of host emission is also decreased. Therefore, Zn2GeO4:Cr3+ are synthesized using a high-temperature solid-phase method. Thermoluminescence (TL) and luminescence decay curves are used to investigate the variation of native defects. The emission colour can be tuned from bluish white to green when Cr3+ doped in Zn2GeO4. This result has guidance for controlling the native emission of self-luminescent material.
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