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Comparative Study on Photoluminescent Properties of CaGdAlO4:Eu3+ Phosphors Synthesized with Three Methods
引用本文:周立亚 石建新 龚孟濂. Comparative Study on Photoluminescent Properties of CaGdAlO4:Eu3+ Phosphors Synthesized with Three Methods[J]. 中国稀土学报(英文版), 2006, 24(2): 138-142. DOI: 10.1016/S1002-0721(06)60081-1
作者姓名:周立亚 石建新 龚孟濂
作者单位:[1]State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China [2]School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
基金项目:Project supported by the Natural Science Foundation of Guangdong Province (021716) and th Scientific and Technical Projects of Guangdong Province (B10502)
摘    要:CaGdAlO4 : Eu^3+ powder phosphors were prepared using citrate sol-gel (CSG), haft-dry and half-wet (HDW) and solid state (SS) methods, respectively. X-ray diffraction results confirm the formation of CaGdAlO4:Eu^3+ at 900 % (CSG), 1200℃ (HDW) and 1400℃ (SS), respectively. Field emission scan electron microscopy (FE-SEM) images show that the CaGdAlO4:Eu^3+ powder prepared by the CSG and HDW method has an elliptical shape and that prepared under the SS method has a flaky shape. Upon excitation with 280 nm UV light, all the CaGdAlO4: Eu^3+ powders show bright red emission on account of the 4f-4f transitions of the Eu^3+ ions. Moreover, the size of the phosphor particles and the emission intensity increase with the increase of calcined temperature. At the same calcination temperature of 1400 ℃, the ^5D0→^7F2 emission intensity of the sample prepared by HDW method is the highest. Stark components of the ^5D0→^7FJ emission transitions, both at room temperature and at a low temperature, reveal that the Eu^3+ ions occupy only one site with non-centrosymmetry in the crystals.

关 键 词:CaGdAlO4:Eu3+ 稀土 合成 发光性能 溶胶-凝胶 柠檬酸盐
文章编号:1002-0721(2006)02-0138-05
收稿时间:2005-01-08
修稿时间:2005-03-14

Comparative Study on Photoluminescent Properties of CaGdAlO4: Eu Phosphors Synthesized with Three Methods
Liya , Jianxin Shi,Menglian Gong. Comparative Study on Photoluminescent Properties of CaGdAlO4: Eu Phosphors Synthesized with Three Methods[J]. Journal of Rare Earths, 2006, 24(2): 138-142. DOI: 10.1016/S1002-0721(06)60081-1
Authors:Liya    Jianxin Shi  Menglian Gong
Affiliation:aState Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China;bSchool of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
Abstract:CaGdAlO4Eu3+ powder phosphors were prepared using citrate sol-gel (CSG), half-dry and half-wet (HDW) and solid state (SS) methods, respectively. X-ray diffraction results confirm the formation of CaGdAlO4: Eu3+ at 900 °C. (CSG), 1200 °C (HDW) and 1400 °C (SS), respectively. Field emission scan electron microscopy (FE-SEM) images show that the GaGdAlO4: Eu3+ powder prepared by the CSG and HDW method has an elliptical shape and that prepared under the SS method has a flaky shape. Upon excitation with 280 nm UV light, all the CaGdAlO4: Eu3+ powders show bright red emission on account of the 4f-4f transitions of the Eu3+ ions. Moreover, the size of the phosphor particles and the emission intensity increase with the increase of calcined temperature. At the same calcination temperature of 1400 °C, the 5D07F2 emission intensity of the sample prepared by HDW method is the highest. Stark components of the 5D07Fj emission transitions, both at room temperature and at a low temperature, reveal that the Eu3+ ions occupy only one site with non-centrosymmetry in the crystals.
Keywords:CaGdAlO4:Eu3+   synthesis   citrate sol-gel   half-dry and half-wet   solid state   photoluminescence   rare earthsCLC number: 0614.33   O621.22
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