Preparation and Luminescence of ZnAl2O4∶Mn Phosphors
Nano-sized manganese-doped zinc aluminate spinel (Zn1-xMnxAl2O4; x =0-6.0 mol%) powder phosphors were prepared by the sol-gel process.Zinc chloride,aluminum isopropoxide,and manganese chloride were employed as precursors.The influences of manganese concentration and heat treatment conditions on the crystallization and photoluminescence of the phosphors were investigated.The dried powders were amorphous to X-ray powder diffraction (XRD) and the single-phase ZnAl2O4 spinel crystallite started to form at temperatures as low as 600℃.The crystallization of powder did not significantly affected by various manganese concentrations.On heating at 1000℃,the resulting powder phosphors had the average crystallite and primary particle sizes of around 20-25 and 20-30 nm,respectively,depending on the dopant content and heating time.Photoluminescence spectra exhibited strong green emission bands centered at 512 nm under an excitation wavelength of 458 nm.The luminescence efficiency has been investigated as a function of dopant content,heating temperature,heating time,and specific surface area of the powders.
ZnAl2O4∶Mn powder sol-gel crystallization luminescence
Mu-Tsun Tsai Bo-Yu Pan Fu-Yuan Liang
Department of Materials Science and Engineering,National Formosa University,Huwei 632,Taiwan
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
182-186
2011-11-04(万方平台首次上网日期,不代表论文的发表时间)