EPR, optical absorption and luminescence studies of Cr3+-doped antimony phosphate glasses
Carregando...
Fonte externa
Fonte externa
Data
Orientador
Coorientador
Pós-graduação
Curso de graduação
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B.V.
Tipo
Artigo
Direito de acesso
Acesso restrito
Fonte externa
Fonte externa
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.
Descrição
Palavras-chave
Antimony phosphate glasses, Trivalent chromium, High strength crystalline field, EPR, Optical absorption, Luminescence
Idioma
Inglês
Citação
Optical Materials. Amsterdam: Elsevier Science Bv, v. 38, p. 119-125, 2014.
