Warm-white persistent luminescence of Lu3Al2Ga3O12：Pr^3＋ phosphor  

作　　者：FENG Lin WANG Zhenbin CAO Cheng ZHANG Teng ZHANG Jiachi CI Zhipeng ZHAO Zhengyan WANG Yuhua 冯琳;王振斌;曹程;张腾;张加驰;慈志鹏;赵争妍;王育华(Key Laboratory for Magnetism Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China)

机构地区：Key Laboratory for Magnetism Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China

出　　处：《Journal of Rare Earths》2017年第1期47-52,共6页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(10904057);the Fundamental Research Funds for Central Universities(Lzjbky-2015-112,Lzjbky-2015-113);the National Science Foundation for Fostering Talents in Basic Research of the National Natural Science Foundation of China(041105,041106)

摘　　要：A warm-white emitting persistent luminescence phosphor Lu3Al2Ga3O12：Pr^3＋ was synthesized by solid state method at 1600 °C in air. The refined crystal structure of Lu3Al2Ga3O12 host was solved by X-ray diffraction（XRD）. The photoluminescence spectra, decay curve and thermoluminescence were investigated. It was revealed that the persistent luminescence originated from the f-f transitions of Pr^3＋ emitters at Lu^3＋ sites in LuO8 polyhedrons, and it showed white color due to the ^3P0→^3H4, ^3P1→^3H5, ^3P0→^3H5, ^3P0→^3H6, ^3P0→^3F2, ^3P0→^3F3 and ^3P0→^3F4 transitions of Pr^3＋ emitters in a wide range. The persistent luminescence of Pr^3＋ in this host could be promoted by f-d transition（278 nm） but f-f transitions, due to the different thermal activation energy. The persistent luminescence of the optimal sample could be actually recorded for 3 h by the definition of 0.32 mcd/m^2 and was visible for more than 7 h by dark-adapted vision in darkness. The initial depth of the dominant shallow traps was calculated to be about 0.56 eV, which is suitable for persistent luminescence. The different roles of the shallow and deep traps on the persistent decay process were investigated. Accordingly, the persistent luminescence processes and mechanism of the as-synthesized Lu3Al2Ga3O12：Pr^3＋ phosphors were proposed.A warm-white emitting persistent luminescence phosphor Lu3Al2Ga3O12：Pr^3＋ was synthesized by solid state method at 1600 °C in air. The refined crystal structure of Lu3Al2Ga3O12 host was solved by X-ray diffraction（XRD）. The photoluminescence spectra, decay curve and thermoluminescence were investigated. It was revealed that the persistent luminescence originated from the f-f transitions of Pr^3＋ emitters at Lu^3＋ sites in LuO8 polyhedrons, and it showed white color due to the ^3P0→^3H4, ^3P1→^3H5, ^3P0→^3H5, ^3P0→^3H6, ^3P0→^3F2, ^3P0→^3F3 and ^3P0→^3F4 transitions of Pr^3＋ emitters in a wide range. The persistent luminescence of Pr^3＋ in this host could be promoted by f-d transition（278 nm） but f-f transitions, due to the different thermal activation energy. The persistent luminescence of the optimal sample could be actually recorded for 3 h by the definition of 0.32 mcd/m^2 and was visible for more than 7 h by dark-adapted vision in darkness. The initial depth of the dominant shallow traps was calculated to be about 0.56 eV, which is suitable for persistent luminescence. The different roles of the shallow and deep traps on the persistent decay process were investigated. Accordingly, the persistent luminescence processes and mechanism of the as-synthesized Lu3Al2Ga3O12：Pr^3＋ phosphors were proposed.

关 键 词：persistent luminescence Lu3Al2Ga3O12 Pr3＋ PHOSPHOR rare earths 

分 类 号：TQ422[化学工程]