The Study on The Preparation and Characterization of Gahnite Phosphors

• Main Authors: You-Hsin Chou, 周佑信
• Other Authors: 蔡木村
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/n3mx37

碩士 === 國立虎尾科技大學 === 材料科學與綠色能源工程研究所 === 99 === In this study, gahnite (ZnAl2O4) phosphors were synthesized by sol-gel method. The effects of activator concentration and heat treatments on the crystallinity, structure, microstructure and photoluminescence (PL) properties were investigated. The as–dried gels began to form ZnAl2O4 structure after heating at 300oC. Homogeneous single-phase ZnAl2O4 was obtained with average grain size of about 10 ~ 40 nm after heating at 300 ~ 1200oC. With increasing heat-treatment temperature at 300 ~ 1200oC, the crystallinity was promoted and the grain size was growth. However, the concentration of activator did not remarkably affect the crystallinity of ZnAl2O4 phosphors. The PL spectra exhibited blue emission bands under an excitation in ultraviolet region for doped phosphors. The relative PL intensity depended on the amount of activator, calcining temperature and the microstructure of phosphors.