Investigation on luminescence property of rare-earth element doped β-LiGaO2 and γ-LiAlO2

• Main Authors: Ming-Yao Yang, 楊明耀
• Other Authors: Ming-Chi Chou
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/c688h7

碩士 === 國立中山大學 === 材料科學研究所 === 96 === The powder phosphor of β-LiGaO2：Ce3+ 、β-LiGaO2：Eu3+ and γ-LiAlO2 were prepared by using the reagents of Ga2O3 (99.999%), Al2O3 (99.99％), Li2CO3 (99.999%), CeO2 (99.98%) and Eu2O3 (99.98%). Cerium and europium doped β-LiGaO2 respectively and europium doped γ-LiAlO2 phosphors were synthesized by the method of high temperature solid-state reaction. The Ga, Al, Li, Ce and Eu reagents were mixed according to the requisite stoichiometric ratios. The mixture was mixed thoroughly and sintered at requisite temperature in a tube furnace in atmosphere for several hours. Then the products were cooled down to room temperature and ground into powder to get the final product. The phase purity and crystallinity of the as-synthesized, cerium and europium doped β-LiGaO2 phosphors respectively and europium doped γ-LiAlO2 phosphors, were characterized using x-ray powder diffraction. The particle size and the morphology of the samples were analyzed by scanning electron microscopy. Luminescence properties of the β-LiGaO2 and the γ-LiAlO2 phosphor samples with different cerium doping and europium doping concentrations were studied. The photoluminescence spectra of cerium doped β-LiGaO2 showed a broad yellow-green light emission range from 450 to 640 nm with the peak at 519 nm. The strongest intensity peak of luminescence was found at 0.5 % cerium doping concentration synthesized at 1000℃. The photoluminescence spectra of europium doped β-LiGaO2 and γ-LiAlO2 showed the orange-red light emission range from 588 to 630 nm with the maximum peak at 612 nm. The strongest intensity peaks of luminescence were found respectively at 9 % and 7 % europium doping concentration synthesized at 1000℃.