Excitation Wavelength Dependent Luminescence of LuNbO4:Pr3+Influences of Intervalence Charge Transfer and Host Sensitization
A series of LuNbO4:Pr3+ phosphors was prepared by a solid-state reaction method at high-temperature. Rietveld refinements were performed based on powder X-ray diffraction (XRD) data. Diffuse reflectance spectra (DRS), UV–vis photoluminescence (PL), time-resolved emission spectra (TRES), and fluoresc...
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Published in | Journal of physical chemistry. C Vol. 120; no. 45; pp. 26044 - 26053 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
American Chemical Society
17.11.2016
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Online Access | Get full text |
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Summary: | A series of LuNbO4:Pr3+ phosphors was prepared by a solid-state reaction method at high-temperature. Rietveld refinements were performed based on powder X-ray diffraction (XRD) data. Diffuse reflectance spectra (DRS), UV–vis photoluminescence (PL), time-resolved emission spectra (TRES), and fluorescence decays were utilized to study the luminescence and host sensitization processes of Pr3+ in LuNbO4. Excitation wavelength dependent luminescence of LuNbO4:Pr3+ was investigated and explained in consideration of the processes of nonradiation relaxation via cross-relaxation, multiphonon relaxation, and crossover to the intervalence charge transfer (IVCT) state. Furthermore, the host sensitization of Pr3+ emission in LuNbO4 was confirmed and the energy transfer efficiency from host to Pr3+ increased with increasing Pr3+ doping concentration/temperature. Because the change of emission intensities for both blue from the host and red from 1D2 is sensitive to temperature, a large variation of emission color is observed between RT and 500 K. |
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ISSN: | 1932-7447 1932-7455 |
DOI: | 10.1021/acs.jpcc.6b09806 |