Wang Zhenbin, Wang Wenxiang, Zhou Hui, Zhang Jiachi, Peng Shanglong, Zhao Zhengyan, Wang Yuhua
Key Laboratory for Magnetism Magnetic Materials of the Ministry of Education, Lanzhou University , Lanzhou 730000, People's Republic of China.
Inorg Chem. 2016 Dec 19;55(24):12822-12831. doi: 10.1021/acs.inorgchem.6b02136. Epub 2016 Nov 30.
An excellent persistent luminescence (PersL) phosphor NaCaGeOF:Mn,Yb has been synthesized by traditional solid-state reaction. By controlling the occupation sites of Mn emitters, the PersL color of this phosphor can be optionally tuned in the red to green-yellow region, and the maximum spectral shift is more than 50 nm. Significantly, the red PersL can be measured for approximately 13 and 3 h (0.32 mcd/m) and can be observed for more than 20 and 5 h with dark-adapted vision after exposure to ultraviolet irradiation and artificial sunlight, respectively. The crystal/electronic structure and photoluminescence/PersL properties of this phosphor have been investigated in detail. A series of the excitation temperature-dependent thermoluminescence experiments and the initial rising method have been conducted to study the trap properties of this phosphor. It reveals the reasons for the variation of PersL color, excellent red PersL, and degradation of green-yellow PersL. According to the results, the as-prepared NaCaGeOF:Mn,Yb can be considered as an excellent red PersL phosphor, and it also has potential for application in optical storage.
通过传统固相反应合成了一种优异的持续发光（PersL）荧光粉NaCaGeOF:Mn,Yb。通过控制Mn发光体的占据位点，该荧光粉的PersL颜色可在红色至绿黄色区域进行任意调节，最大光谱位移超过50 nm。值得注意的是，在紫外光照射和人工阳光照射后，分别用暗适应视觉可测量到红色PersL约13小时和3小时（0.32 mcd/m²），并可观察到超过20小时和5小时。详细研究了该荧光粉的晶体/电子结构和光致发光/PersL特性。进行了一系列与激发温度相关的热释光实验和初始上升法来研究该荧光粉的陷阱特性。揭示了PersL颜色变化、优异的红色PersL以及绿黄色PersL退化的原因。根据结果，所制备的NaCaGeOF:Mn,Yb可被视为一种优异的红色PersL荧光粉，并且在光存储方面也具有应用潜力。
