Molten salt synthesis of Zn_1.8Mn_0.2SiO₄ luminescent materials in NaCl-ZnCl₂ eutectic salt

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• 作者：Guiqing Hu^a ; Wenyao Li^a ; ^{liwenyao314@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Guanjie He^b ; Jingru Wang^a ; Yanhong Zhao^a ; Yan Zhang^a ; Baodian Yao^a
• 关键词：Low-temperature ; NaCl&ndash ; ZnCl2 eutectic salts ; Luminescence intensity ; Luminescence decay time
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：1 May 2016
• 年：2016
• 卷：42
• 期：6
• 页码：7852-7856
• 全文大小：1300 K

文摘

A low-temperature molten salt method has been used to synthesis Zn₂SiO₄:Mn (ZSM) powders in NaCl–ZnCl₂ eutectic salts by using calcined SBA-15 as silica source without any post-treatment. Characterizations of the samples were carried out by X-ray diffraction, high resolution selection electron microscopy, Raman Spectroscopy and Photoluminescence. Our study revealed that the well crystalline ZSM was obtained at 450 °C, much lower than the conventional solid-state reaction temperature but also get better crystallinity when the temperature increased to 500 °C. The SEM micrographs of ZSM are comprised of irregular rod-like structure with different length–diameter ratio, which showed the average length is about 1 μm and the average diameter is around 100 nm. Besides, the UV excitation spectra showed that the ZSM phosphor exhibited a strong green emission around 527 nm and reached the highest luminescence intensity with the Mn doping concentration of 0.2. In addition, the luminescence decay time of Zn_1.8Mn_0.2SiO₄ (x=0.2) around 527 nm lasted for 14.25 ms upon 245 nm excitation.