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作 者:顾席光 傅仁利 蒋维娜 张鹏飞 汤晔 Arzu COSGUN
机构地区:[1]College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics
出 处:《Journal of Rare Earths》2015年第9期954-960,共7页稀土学报(英文版)
基 金:supported by the Funding of Jiangsu Innovation Program for Graduate Education(CXZZ12_0147);funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions
摘 要:LaSr2A1Os:Sm3+ phosphors were synthesized by the Pechini-type sol-gel process. The X-ray diffraction pattern revealed that a pure LaSr2AIO5 phase was obtained with a sintering temperature of 1200 ℃. Microstructure characterization showed that the particles were spherical in shape with a mean size of 2.93 μm. Being a candidate orange/red emitting phosphor for orange and white light emitting diodes, LaSr2A1Os:Sm3+ could be effectively excited by both near-ultraviolet (NUV) and blue lights with typical f-f transitions of Sm3+ ions. The most intense emission corresponding to 4G5/2---*6H7/2 (604 nm) could be achieved at the same Sm3+ concentration of 4 mol.%. The chromaticity coordinates of La0.96Sr2A1Os:0.04Sm3. phosphor under the excitation of 407 and 458 nm were (0.57, 0.43) and (0.59, 0.38), respectively. Further study was carried out using Van Uitert's and Dexter's models. A consistent result was obtained that electric dipole-dipole interaction was dominant for the energy transfer among Sm3+ ions. The critical distance for energy transfer among Sm3+ ions in LaSr2A105 was calculated to be ca. 1.843 nm.LaSr2A1Os:Sm3+ phosphors were synthesized by the Pechini-type sol-gel process. The X-ray diffraction pattern revealed that a pure LaSr2AIO5 phase was obtained with a sintering temperature of 1200 ℃. Microstructure characterization showed that the particles were spherical in shape with a mean size of 2.93 μm. Being a candidate orange/red emitting phosphor for orange and white light emitting diodes, LaSr2A1Os:Sm3+ could be effectively excited by both near-ultraviolet (NUV) and blue lights with typical f-f transitions of Sm3+ ions. The most intense emission corresponding to 4G5/2---*6H7/2 (604 nm) could be achieved at the same Sm3+ concentration of 4 mol.%. The chromaticity coordinates of La0.96Sr2A1Os:0.04Sm3. phosphor under the excitation of 407 and 458 nm were (0.57, 0.43) and (0.59, 0.38), respectively. Further study was carried out using Van Uitert's and Dexter's models. A consistent result was obtained that electric dipole-dipole interaction was dominant for the energy transfer among Sm3+ ions. The critical distance for energy transfer among Sm3+ ions in LaSr2A105 was calculated to be ca. 1.843 nm.
关 键 词:PHOTOLUMINESCENCE LaSr2AlO5 Sm3+ PHOSPHORS sol-gel process rare earths
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