Synthesis and Luminescence Properties of Y2O3:Eu3+ Phosphors

• Main Authors: Yu-Chih Cheng, 鄭有志
• Other Authors: Chi-Shaing Huang
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/69429461387564973643

碩士 === 國立成功大學 === 材料科學及工程學系碩博士班 === 92 === 　　To improve the photoluminescence properties of red emission phosphors used for 383 nm UV-LED Y2O3:Eu3+ powders were synthesized by solid state and sol-gel methods. Effects of the contents of Eu2O3 & SiO2 and calcining parameters on the phosphors crystallization, particle size, shape and photoluminescence properties were investigated. 　　Y2O3:Eu3+ phosphor powders synthesized by solid state and sol-gel methods and then calcined at 1500℃for 4 h, show the absorption and emission behavior under excitation source around 360-420 nm UV-light. The phosphor shows the strongest emission peak at 612 nm when the excitation source is 395 nm. 　　The Y2O3:Eu3+ (Eu3+=1~20 mole%) phosphors synthesized by solid state and sol-gel method then calcined at 1100~1500℃ for 4 h both show one phase of Y2O3. Its relative emission intensity (at 612 nm) increases with calcining temperature and Eu3+ dopants. It shows the strongest emission intensity when 19 mole% Eu3+ doped in Y2O3 phosphor powder. 4~10 wt% of SiO2 additions increase the relative emission intensity of (Y0.91Eu0.09)2O3 phosphor powder. Y2O3:Eu3+ phosphor powder synthesized by sol-gel method shows better relative emission intensity, relative Q. E. and absorption efficiency than powders synthesized by solid state method.