Novel Self-Activated Zinc Gallogermanate Phosphor: The Origin of its Photoluminescence

作者：Ren, Jing^*; Xu, Xiaoqing; Zeng, Huidan; Chen, Guorong; Kong, Deshuang; Gu, Changjun; Chen, Chunming; Liu, Zhibin; Kong, Linren

来源：Journal of the American Ceramic Society, 2014, 97(10): 3197-3201.

DOI：10.1111/jace.13103

• LONG-PERSISTENT
• NATIVE DEFECTS
• LUMINESCENCE
• ZNGA2O4-MN2+
• LIGHT

Since 2012, zinc gallogermanate has drawn interests as an excellent host phosphor for a variety of dopants (e.g., Cr3+, Bi3+ and Mn2+). However, the origin of its self-activated luminescence has been largely unknown. Here, zinc gallogermanate of the composition Zn1+xGa2-2xGexO4 (0x1) is prepared by solid-state reaction, and the evolution of the crystal structure with the composition is studied. The phosphors show a broad white-bluish emission upon excitation by ultraviolet (UV) light, and the luminescence intensity greatly increases as Ga3+ are substituted by Ge4+. A full spectrum of the defects and trap centers responsible for the luminescence is given by a multiple characterization methods, such as low temperature electron spin resonance, positron annihilation lifetime and thermoluminescence spectra. The results show that the zinc gallogermanate is a promising self-activated phosphor for a variety of applications.

• 出版日期2014-10
• 单位华东理工大学