Near-infrared downconversion luminescence of SrMoO{sub 4}:Tm{sup 3+},Yb{sup 3+} phosphors

• Published in: Materials research bulletin Vol. 93
• Main Authors: Li, Li, Pan, Yu, Chang, Wenxuan, Feng, Zhongshan, Chen, Peng, Li, Chen, Zeng, Ziyu, Zhou, Xianju
• Format: Journal Article
• Language: English
• Published: United States 15.09.2017
• Subjects: DENSITY FUNCTIONAL METHOD; ELECTRONIC STRUCTURE; EMISSION SPECTRA; EMISSIVITY; ENERGY EFFICIENCY; ENERGY TRANSFER; MATERIALS SCIENCE; OXIDES; PHOSPHORS; PHOTOLUMINESCENCE; TEMPERATURE RANGE 0400-1000 K; THULIUM IONS; X-RAY DIFFRACTION; YTTERBIUM IONS
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/J.MATERRESBULL.2017.04.035

Graphical abstract: The calculated band structure of SrMoO{sub 4} and the visible and infrared emission spectra of SrMoO{sub 4}:1%Tm{sup 3+},10%Yb{sup 3+} phosphors under 283 nm excitation.▪ - Highlights: • Near-infrared downconversion luminescence of SrMoO{sub 4}:Tm{sup 3+},Yb{sup 3+} phosphors were systematically investigated. • The electronic structure of SrMoO{sub 4} was estimated by density functional theory. • The quenching concentration of Yb{sup 3+} ions approaches 10 mol%. • The energy transfer mechanism was discussed in detail. - Abstract: Tm{sup 3+} and Yb{sup 3+} codoped SrMoO{sub 4} phosphors were synthesized by the high-temperature solid-state reaction method. The structure, ultraviolet-visible diffuse reflectance spectra, photoluminescence, decay properties and theoretical energy transfer efficiency of the phosphors were investigated in detail. The electronic structure and band gap of SrMoO{sub 4} were estimated by density functional theory (DFT) calculation. The XRD results show that all the prepared phosphors can be readily indexed to scheelite-type structure. The strong visible emission around 473 nm from Tm{sup 3+} ({sup 1}G{sub 4} → {sup 3}H{sub 6}) and near-infrared (NIR) emission around 998 nm from Yb{sup 3+} ({sup 2}F{sub 5/2} → {sup 2}F{sub 7/2}) of the SrMoO{sub 4}:Tm{sup 3+},Yb{sup 3+} phosphors were observed under 283 nm excitation. The dependence of the visible and NIR emissions on Yb{sup 3+} concentration have also been investigated. The quenching concentration of Yb{sup 3+} ions approaches 10 mol%. In addition, the energy transfer processes and possible transfer routes were proposed.