Nd3+ emissions in transparent ferroelectric ceramic hosts under ultraviolet excitation

Autor(es)

Correr, G. I. ; Badillo, F. A. L. ; Botero, E. R. ; Milton, F. P. ; Garcia, D. ; de Godoy, M. P. F.

• Tipo de documento: Artigo Científico
• Fonte: CERAMICS INTERNATIONAL; v. 48, n. 9, p. 9-pg., 2022-03-21.

Resumo

This work investigates the optical response of two Nd-doped relaxor ferroelectric ceramics, PLZT (lanthanum modified lead zirconate titanate) and PLMN-PT (lanthanum modified lead magnesium niobate - lead titanate). The electrical induced birefringence characterization evaluates the nonergodic to ergodic transition, and the Kerr response from 100 K to 600 K. UV-VIS optical absorption showed the presence of well-diluted ions in the valence +3. Photoluminescence measurements (PL) excited in the ultraviolet (UV) range (lambda = 325 nm) evidenced three channels of emissions: the fundamental F-4(3/2) -> I-4(9/2) and the transitions between excited levels associated with Nd3+, and the host Ti-O band. Temperature-dependent PL allowed a qualitative and quantitative analysis of the role of these optical emissions channels. Besides, intensity-dependent microphotoluminescence evidenced the character of the ionic and continuum nature of these emissions. At the same experimental conditions, a tendency of emission saturation at high UV excitation in PLMN-PT can be attributed to a slower mechanism of optical transitions than that of PLZT neodymium host. (AU)

• Processo FAPESP: 14/07375-2 - EMU concedido no projeto 2013/18719-1: sistema de medidas resolvidas no tempo
• Beneficiário: Marcio Daldin Teodoro
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 18/25886-5 - Espectroscopia em perovskitas a base de niobatos dopados com terras-raras
• Beneficiário: Guilherme Ilario Correr
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 15/13771-0 - EMU concedido no processo 14/19142-2: criostato de ultra baixa vibração com campo magnético e microscópio confocal
• Beneficiário: Gilmar Eugenio Marques
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários