Solvothermal synthesis of Zn₂GeO₄:Mn²⁺ nanophosphor in water/diethylene glycol system

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• 作者：Satoru Takeshita^a ; Joji Honda^a ; Tetsuhiko Isobe^a ; ^{isobe@applc.keio.ac.jp} ; Tomohiro Sawayama^b ; Seiji Niikura^b
• 关键词：Nanophosphor ; Photoluminescence ; Solvothermal synthesis ; Zn2GeO4 ; Mn2+
• 刊名：Journal of Solid State Chemistry
• 出版年：2012
• 期刊代码：130_00224596
• 类别：ch
• 出版时间：May, 2012
• 卷：189
• 期：Complete
• 页码：112-116
• 文件大小：947 K

摘要

The influence of aging of the suspension containing the amorphous precusors on structural, compositional and photoluminescent properties is studied to understand the mechanism on the formation of Zn₂GeO₄:Mn²⁺ nanoparticles during the solvothermal reaction in the water/diethylene glycol mixed solvent. Aging at 200 掳C for 20 min forms the crystalline Zn₂GeO₄ nanorods and then they grow up to 鈭?50 nm in mean length after aging for 240 min. Their interplanar spacing of (410) increases with increasing the aging time. The photoluminescence intensity corresponding to the d-d transition of Mn²⁺ increases with increasing the aging time up to 120 min, and then decreases after aging for 240 min. The photoluminescence lifetime decreases with increasing the aging time, indicating the locally concentrated Mn²⁺ ions. These results reveal that Mn²⁺ ions gradually replace Zn²⁺ ions near surface through repeating dissolusion and precipitation processes during prolonged aging after the complete crystallization of Zn₂GeO₄.