Fabrication and luminescent properties of Al₂O₃:Cr^3 + microspheres via a microwave solvothermal route followed by heat treatment

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• 作者：Zhenfeng Zhu ; ^{zhuzf@sust.edu.cn} ; ^{nmlab@sust.edu.cn} ; Dianguang Liu ; Hui Liu ; Juan Du ; Hongguang Yu ; Jie Deng
• 关键词：Microwave solvothermal route ; Al2O3 ; Cr3  ; + ; Luminescence ; Microspheres
• 刊名：Optics Communications
• 出版年：2012
• 期刊代码：50_00304018
• 类别：ph
• 出版时间：15 June, 2012
• 卷：285
• 期：13-14
• 页码：3140-3142
• 文件大小：373 K

摘要

AlOOH:Cr^3 + powders were synthesized via a microwave solvothermal route at 433 K for 30 min and were used as the precursor and template for the preparation of 纬-Al₂O₃:Cr^3 + by thermal transformation at 773 K for 2 h in air. The obtained 纬-Al₂O₃ based powders were microspheres with an average diameter about 1.9 渭m. Photoluminescence (PL) spectra showed that the Al₂O₃:Cr^3 + particles presented a symmetric broad R band at 696 nm without appreciable splitting when excited at 462 nm. It is shown that the 0.04 mol%of doping concentration of Cr^3 + ions in 纬-Al₂O₃:Cr^3 + is optimum. According to Dexter's theory, the critical distance between Cr^3 + ions for energy transfer was determined to be 47.54 脜. Based on the corresponding PL spectrum, full width at half maximum (FWHM) of Al₂O₃:Cr^3 + (0.04 mol%) was calculated to be 3.35 nm.