gallium(III) oxide 、 silica gel 、 lithium carbonate 在
air 作用下,
以
neat (no solvent, solid phase) 为溶剂,
反应 4.0h,
生成
参考文献:
名称:
氧空位取代调节自激活 LiGaSi(1-x)GexO4 荧光粉的光致发光
摘要:
制备低成本、多功能的荧光粉是一项重要且具有挑战性的工作。本文采用高温固相法成功合成了一种高纯度自激活LiGaSiO 4 荧光粉,该荧光粉可发射峰值为697 nm的近红外光。通过在不同气氛中对LiGaSiO 4化合物进行热处理,可以观察到可逆的热致变色现象。通过光致发光光谱、电子顺磁共振和第一性原理计算对发光机理和热致变色现象进行了详细研究。结果表明,LiGaSiO 4化合物中的氧空位在近红外发光过程中起重要作用。基于这种发光机制,一系列 LiGaSi(1- x ) Ge x O 4 ( x = 0.2, 0.4, 0.6, 0.8, 1.0) 自激活荧光粉已被制造出来,并推断出相应的发光调制。结果表明,热致变色LiGaSi (1- x ) Ge x O 4荧光粉可用作特殊的防伪和生物成像材料。
Structural, persistent luminescence properties and trap characteristics of an orthosilicate phosphor: LiGaSiO4:Mn2+
作者:Xiaodong Li、Xue Tang、Zhenbin Wang、Zehua Zou、Jiachi Zhang、Zhipeng Ci、Yuhua Wang
DOI:10.1016/j.jallcom.2017.06.054
日期:2017.10
A novel orthosilicate persistent phosphor LiGaSiO4:Mn2+ has been developed by solid state reaction method. The refined crystal structure of the LiGaSiO4 is solved. The photoluminescence and persistent spectra, decay curve and thermoluminescence have been investigated in details. It reveals that the Mn2+ at Li+ sites in the LiO4 tetrahedron are able to show intense green persistent luminescence, which can be measured for approximately 6 h and 2.1 h (0.32 mcd/m(2)) after exposure to ultraviolet and artificial sunlight irradiation. The trap distribution of phosphor is studied by using a series of excitation temperature dependent thermoluminescence experiments based on initial rising method. The different roles of the shallow and deep traps on the persistent luminescence have been revealed by the thermoluminescence fading experiments. (C) 2017 Elsevier B.V. All rights reserved.
Synthesis and structural characterization of a lithium gallosilicate with the zeolite ABW-framework