Photoluminescence properties of an orange-red LaSr2AlO5:Sm3+ phosphor prepared by the Pechini-type sol-gel process
来源期刊：Journal of Rare Earths2015年第9期
论文作者：顾席光 傅仁利 蒋维娜 张鹏飞 汤晔 Arzu CO?GUN
文章页码：954 - 960
摘 要：LaSr2AlO5:Sm3+ phosphors were synthesized by the Pechini-type sol-gel process. The X-ray diffraction pattern revealed that a pure LaSr2AlO5 phase was obtained with a sintering temperature of 1200 °C. 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, La Sr2 Al O5: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 La0.96Sr2 Al O5:0.04Sm3+ 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 La Sr2 Al O5 was calculated to be ca. 1.843 nm.
顾席光，傅仁利，蒋维娜，张鹏飞，汤晔，Arzu CO?GUN
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics
摘 要：LaSr2AlO5:Sm3+ phosphors were synthesized by the Pechini-type sol-gel process. The X-ray diffraction pattern revealed that a pure LaSr2AlO5 phase was obtained with a sintering temperature of 1200 °C. 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, La Sr2 Al O5: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 La0.96Sr2 Al O5:0.04Sm3+ 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 La Sr2 Al O5 was calculated to be ca. 1.843 nm.
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