EPR, optical absorption and luminescence studies of Cr3+-doped antimony phosphate glasses

Autor(es)

De Vicente, F. S. ^[1] ; Santos, F. A. ^[2] ; Simoes, B. S. ^[3] ; Dias, S. T. ^[4] ; Siu Li, M. ^[4]

Afiliação do(s) autor(es)

^[1] UNESP Univ Estadual Paulista, Dept Fis, BR-13506900 Rio Claro, SP - Brazil

^[2] UFGD Univ Fed Grande Dourados, Fac Ciencias Exatas & Tecnol, BR-79804970 Dourados, MS - Brazil

^[3] UFSC Univ Fed Santa Catarina, Ctr Ciencias Educ, BR-88010970 Florianopolis, SC - Brazil

^[4] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Optical Materials; v. 38, p. 119-125, DEC 2014.
• Citações Web of Science: 18
• Assunto(s): Luminescência

Resumo

Antimony phosphate glasses (SbPO) doped with 3 and 6 mol% of Cr3+ were studied by Electron Paramagnetic Resonance (EPR), UV-VIS optical absorption and luminescence spectroscopy. The EPR spectra of Cr3+-doped glasses showed two principal resonance signals with effective g values at g = 5.11 and g = 1,97. UV-VIS optical absorption spectra of SbPO:Cr3+ Presented four characteristics bands at 457, 641, 675, and 705 nm related to the transitions from (4)A(2)(F) to T-4(1)(F), T-4(2)(F), T-2(1)(G), and E-2(G), respectively, of Cr3+ ions in octahedral symmetry. Optical absorption spectra of SbPO:Cr3+ allowed evaluating the crystalline field Dq, Racah parameters (B and C) and Dq/B. The calculated value of Dq/B = 2.48 indicates that Cr3+ ions in SbPO glasses are in strong ligand field sites. The optical band gap for SbPO and SbPO:Cr3+ were evaluated from the UV optical absorption edges. Luminescence measurements of pure and Cr3+-doped glasses excited with 350 nm revealed weak emission bands from 400 to 600 nm due to the P-3(1) -> S-1(0) electronic transition from Sb3+ ions. Cr(3+-)doped glasses excited with 415 nm presented Cr3+ characteristic luminescence spectra composed by two broad bands, one band centered at 645 nm (E-2 -> (4)A(2)) and another intense band from 700 to 850 nm (T-4(2) -> (4)A(2)). (C) 2014 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 11/18149-5 - Estudo de filmes híbridos de sílica luminescentes e fotossensíveis preparados via sol-gel
• Beneficiário: Fábio Simões de Vicente
• Modalidade de apoio: Auxílio à Pesquisa - Regular