The study of KCaPO4:RE3+ (RE3+ = Eu3+, Sm3+, Tb3+) phosphors synthesized using microwave sintering

• Main Authors: Ya-Li Huang, 黃雅莉
• Other Authors: Pan Cheng Tang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/65j79n

碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 101 === The main purposes of this thesis are developing the Calcium Potassium orthophosphate (KCaPO4) phosphor having hexagonal structure by microwave sintering and studying its characteristics. KCaPO4 doped Eu3+, Sm3+, and Tb3+ as activator was studied in this thesis. Additionally, we investigated the effects of the doping concentration and sintering method on the microstructural and optical properties of Calcium potassium phosphate by X-ray diffraction (XRD), scanning electron microscope (SEM), and photoluminescence spectrum (PL). The results showed that the best doping concentration of the activator Eu3+ is X=0.13, and emitted a bright red light by a wavelength of 395nm. When the doping concentration was more than the best values, the luminescence intensity could be influenced by concentration quench due to the excess doping concentration. When the Sm3+ activator was doped, the optimum doping concentration is X=0.02, and emitted a bright orange-red light by a wavelength of 404nm. However, the concentration quench happened due to the overmuch doping concentration. Finally, when the Tb3+ activator was doped, the optimum doping concentration is X=0.05. KCaPO4:Tb3+ phosphor synthesized using a stoichiometric method without deficit of the P source material cause that the characteristic peaks α-KCaPO4 andγ-KCaPO4 were observed to coexist in an XRD pattern. The chromaticity coordinate of KCaPO4:Tb3+ phosphor varied with the concentration of Tb3+ ions from blue to green, indicating that could be modulated according to the different applications.