Upconversion luminescence of KGd(MoO_4)_2:Er^(3+),Yb^(3+) powder prepared by Pechini method  

作　　者：陈起静 秦连杰 冯志强 葛如 赵相金 徐惠忠 

机构地区：[1]School of Environmental and Material Engineering, Yantai University

出　　处：《Journal of Rare Earths》2011年第9期843-848,共6页稀土学报（英文版）

基　　金：Project supported by Shandong Province Natural Science Foundation (Y2008F10);the Award Fund for Prominent Youth Scientists of Shandong Province (2008BS09006);Shandong Province Higher Educational Science and Technology Program (J10LD1810-13)

摘　　要：Er3＋ doped potassium gadolinium molybdate （KGM） phosphor with sensitizer Yb3＋ ion was synthesized by the Pechini method using citric acid and ethylene glycol. The crystallization processes of the phosphor precursors were characterized by X-ray diffraction （XRD） and thermogravimetry-differential scanning calorimetry （TG-DSC）, which indicated that ultrafine uniform crystallites of KGM：Er,Yb were obtained by sintering the precursors at above 650 ℃ for 5 h. Upconversion luminescence （UL） spectra of the samples were studied by a 976 nm semiconductor laser diode （LD） excitation. The UL spectra exhibited the green and red emission bands that were attributed to the 2H11/2, 4S3/2→4I15/2 and 4F9/2→4I15/2 transitions of Er3＋, respectively. The possible UL mechanisms of Er3＋ were explained by means of an energy level diagram. The maximum luminescent intensity was achieved when the concentration of Er3＋, Yb3＋ arrived at 1 mol.% and 20 mol.%, respectively.Er3＋ doped potassium gadolinium molybdate （KGM） phosphor with sensitizer Yb3＋ ion was synthesized by the Pechini method using citric acid and ethylene glycol. The crystallization processes of the phosphor precursors were characterized by X-ray diffraction （XRD） and thermogravimetry-differential scanning calorimetry （TG-DSC）, which indicated that ultrafine uniform crystallites of KGM：Er,Yb were obtained by sintering the precursors at above 650 ℃ for 5 h. Upconversion luminescence （UL） spectra of the samples were studied by a 976 nm semiconductor laser diode （LD） excitation. The UL spectra exhibited the green and red emission bands that were attributed to the 2H11/2, 4S3/2→4I15/2 and 4F9/2→4I15/2 transitions of Er3＋, respectively. The possible UL mechanisms of Er3＋ were explained by means of an energy level diagram. The maximum luminescent intensity was achieved when the concentration of Er3＋, Yb3＋ arrived at 1 mol.% and 20 mol.%, respectively.

关 键 词：KGd（MoO4）2：Er3＋ Yb3＋ upconversion luminescence Pechini method rare earths 

分 类 号：O614.33[理学—无机化学]