Novel Self‐Activated Zinc Gallogermanate Phosphor: The Origin of its Photoluminescence
Novel Self‐Activated Zinc Gallogermanate Phosphor: The Origin of its Photoluminescence
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DOI：
10.1111/jace.13103
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发表时间：
2014-10
影响因子：
3.9
通讯作者：
Jing Ren;Xiaoqing Xu;Huidan Zeng;Guorong Chen;Deshuang Kong;Changjun Gu;Chunming Chen;Liu Zhibin-Liu-Zhi
中科院分区：
文献类型：
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作者：
Jing Ren;Xiaoqing Xu;Huidan Zeng;Guorong Chen;Deshuang Kong;Changjun Gu;Chunming Chen;Liu Zhibin-Liu-Zhi
自2012年以来，没食锗酸锌作为多种掺杂剂（如Cr3+， Bi3+和Mn2+）的优良宿主荧光粉引起了人们的兴趣。然而，其自激活发光的起源在很大程度上是未知的。本文采用固相反应法制备了成分为Zn1+xGa2−2xGexO4（0≤x≤1）的没食子锗酸锌，并研究了该成分对晶体结构的影响。在紫外光激发下，荧光粉呈现出较宽的白蓝色发光，并且随着Ga3+被Ge4+取代，发光强度大大增加。通过低温电子自旋共振、正电子湮灭寿命和热致发光光谱等多种表征方法，给出了导致发光的缺陷和陷阱中心的全谱。结果表明，没食子酸锌是一种具有广泛应用前景的自激活荧光粉。
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.