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

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 (0 ≤ x ≤ 1) is prepar...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2014-10, Vol.97 (10), p.3197-3201
Main Authors: Ren, Jing, Xu, Xiaoqing, Zeng, Huidan, Chen, Guorong, Kong, Deshuang, Gu, Changjun, Chen, Chunming, Liu, Zhibin, Kong, Linren
Format: Article
Language:English
Subjects:
Ceramics
Crystal structure
Luminescence
Phosphorus
Temperature
Ultraviolet radiation
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Summary: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 (0 ≤ x ≤ 1) 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.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.13103