Cold white light generation through the simultaneous emission from Ce3+ and Tb3+ in sodium germanate glass |
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| Affiliation: | 1. Departamento de Física, Universidad de Sonora (UNISON), Boulevard Luis Encinas y Rosales s/n, Hermosillo, Sonora 83000, Mexico;2. Departamento de Investigación en Física, Universidad de Sonora (UNISON), Boulevard Luis Encinas y Rosales s/n, Hermosillo, Sonora 83000, Mexico;3. Centro de investigación en Materiales Avanzados, S.C. Miguel de Cervantes 120, Complejo industrial Chihuahua, Chihuahua, Chihuahua 31109, Mexico;4. Centro de Investigaciones y Estudios Avanzados del IPN, Departamento de Física, P.O. Box 14-7400, México, D.F. 7000, Mexico;5. Departamento de Física, Universidad Autónoma Metropolitana-Iztapalapa, P.O. Box 55-534, México, D.F. 09340, Mexico;1. Instituto de Fisica, Universidade Federal de Uberlandia, CEP38408-902 Uberlandia, Minas Gerais, Brazil;2. CIMAP – Centre de recherche sur les Ions, les Matériaux et la Photonique UMR 6252 CEA-CNRS-ENSICAEN-Université de Caen, 14050 CAEN Cedex 4, France;3. Instituto de Física de São Carlos, Universidade de São Paulo, USP, CEP 13560-970 São Carlos, SP, Brazil;1. College of Materials Science and Engineering, Hunan University, Changsha 410082, China;2. Center for Functional Materials of Pingxiang, Pingxiang 337055, China;1. Nankai University School of Medicine, Nankai University, 94 Weijin Road, Tianjin 300071, PR China;2. State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, PR China;1. School of Materials Science and Engineering, Shanghai University, No. 99 Shangda Road, Baoshan District, Shanghai 200444, China;2. Instrumental Analysis and Research Center, Shanghai University, China;1. Institute of Geology and Nature Management, Far Eastern Branch of the Russian Academy of Sciences, 675000 Blagoveschensk, Amur Region, Russia;2. Amur State University, 675027 Blagoveschensk, Amur Region, Russia;3. Chemistry of Interfaces, Luleå University of Technology, S-97187 Luleå, Sweden |
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| Abstract: | A spectroscopic investigation of sodium germanate glasses activated with Ce3+, Tb3+ and Ce3+/Tb3+ is carried out by analyzing their photoluminescence spectra and decay times. Non-radiative energy transfer from Ce3+ to Tb3+ is observed upon near-UV excitation at 310 nm (peak emission wavelength of AlGaN-based LEDs). The non-radiative nature of this energy transfer is inferred from the increase in the decay rate of the Ce3+ emission when the glass is co-doped with Tb3+. From an analysis of the Ce3+ emission decay time curve it is inferred that an electric dipole–quadrupole interaction might to be the dominant mechanism for the Tb3+ emission sensitized by Ce3+. Energy transfer from Ce3+ to Tb3+ leads to a simultaneous emission of these ions in the blue, green, yellow and red, resulting in white light with CIE1931 chromaticity coordinates, x = 0.30 and y = 0.32, which correspond to cold white light with a colour temperature of 7320 K and very small deviation from the Planckian black-body radiator locus (0.005). |
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| Keywords: | Germanate glass Photoluminescence Non-radiative energy transfer White light |
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