Autor(es)

Yakubu, S. ; Eiras, J. A. ; Lente, M. H.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Luminescence; v. 288, p. 11-pg., 2025-12-01.

Resumo

The crystal structure of most ferroelectric materials can be locally distorted by changing the temperature, pressure, or by applying an electric BIAS field. Doping such ferroelectric material with rare-earth (RE) metals activates f-f electronic transitions, resulting in light emission. When external fields are applied to rare-earth-doped ferroelectrics (RE-F), the resulting modification in the local symmetry around the rare-earth dopant sites may promote the tuning of the photoluminescence properties of the RE-F. Such behavior opens great potential for optical applications of RE-F in photonic displays and medical ultrasonic imaging transducers. This work reports the synthesis of Er-Yb-doped PMN-0.30 PT ceramics and the characterization of their physical properties, primarily the photoluminescent ones, aiming to investigate the potential applications of such compounds in piezo-photonics and ferro-photonics devices. The room temperature up-conversion photoluminescence spectrum of the as-sintered ceramic bodies revealed two emissions at about 550 nm and 669 nm corresponding to the transition from 4S3/2 -> 4I15/2 and 4F9/2 -> 4I15/2 of Er3+ ions, respectively. Then, it was verified that the emission intensity is proportional to the nth power of the excitation intensity (I proportional to Pn), as proposed by theoretical models. The relationship: I proportional to Pn, were investigated before and after a poling process, and the results were discussed based on the anisotropy in photoluminescent properties driven by changes in the Judd-Ofelt Omega 2 intensity parameter related to the local crystal field around the RE ions in both parallel and perpendicular directions to the applied D.C. electric field. (AU)

• Processo FAPESP: 17/13769-1 - Materiais multiferróicos e ferroelétricos para conversores de energia: síntese, propriedades, fenomenologia e aplicações
• Beneficiário: José Antonio Eiras
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 22/05578-0 - Crescimento de monocristais multiferróicos e caracterização de propriedades ópticas para aplicações em piezofotônica
• Beneficiário: Yakubu Shedrach
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 24/06119-4 - Crescimento de monocristais multiferróicos e caracterização de propriedades ópticas para aplicações em piezofotônica
• Beneficiário: Yakubu Shedrach
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 17/17543-8 - Síntese e modulação de propriedades ópticas via efeito piezoelétrico em cerâmicas piezofotônicas a base de (Na K)(Nb Er)O3
• Beneficiário: Manuel Henrique Lente
• Modalidade de apoio: Auxílio à Pesquisa - Regular