Towards a white-emitting phosphor Ca10V6O25 based material

Autor(es)

Teixeira, Mayara Mondego ^[1] ; Gobato, Yara Galva ^{[2, 3]} ; Gracia, Lourdes ^{[4, 5]} ; da Silva, Luis Fernando ^[2] ; Avansi Jr, Waldir ; Assis, Marcelo ^[1] ; de Oliveira, Regiane Cristina ^[6] ; Prando, Gabriela Augusta ^[7] ; Andres, Juan ^[4] ; Longo, Elson ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, CDMF UFSCar, POB 676, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Fis, Rod Washington Luiz, Km 235, CP 676, BR-13565905 Sao Carlos, SP - Brazil

^[3] Radboud Univ Nijmegen, High Fields Magnet Lab, Toernooiveld 7, NL-6525 ED Nijmegen - Netherlands

^[4] Univ Jaume 1, Dept Quim Fis & Analit, Castellon de La Plana 12071 - Spain

^[5] Univ Valencia, Dept Quim Fis, E-46100 Burjassot - Spain

^[6] Univ Estadual Sao Paulo, Fac Ciencias, Grp Modelagem & Simulacoes Mol, Bauru, SP - Brazil

^[7] Avansi Jr, Jr., Waldir, Univ Fed Sao Carlos, Dept Fis, Rod Washington Luiz, Km 235, CP 676, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Luminescence; v. 220, APR 2020.
• Citações Web of Science: 0

Resumo

To achieve a stable material capable of white-light emission, we fabricated Ca10V6O25 by both co-precipitation (CP) and microwave-assisted hydrothermal (MAH) methods at different temperatures. The effects of structural disorder at a short-range (Raman spectra), medium-range (UV-vis spectra), and long-range (X-ray diffraction) on the material structure and its effect on optical properties were investigated. Both CP and the MAH methods were efficient for obtaining pure Ca10V6O25 material with different morphologies. Significant changes in morphology and degree of structural order and disorder were found to affect the photoluminescence (PL) properties. All samples exhibited a broadband PL spectrum, characteristic associated to charge transfer processes of the {[}VO4](3-) group, as well as transitions that occurred in the energy levels located within the band gap. The samples obtained by the MAH method at temperatures of 100 degrees C and 120 degrees C exhibited a lower structural disorder (at long- and short-ranges), the CIE chromaticity coordinates were located in the white region, MAH100 (x = 0.311 and y = 0.348) and MAH120 (x = 0.350 and y = 0.368). Furthermore, we conducted a detailed study of temperature dependence of PL spectra. All samples displayed decreased luminescence intensity as temperatures increased and low values of activation energy (approximately 2 meV). Finally, the as-synthetized Ca10V6O25 material has interesting properties for possible applications as a white-emitting phosphor under ultraviolet excitation. (AU)

• Processo FAPESP: 18/01808-5 - Propriedades ópticas e de transporte em altos campos magnéticos de heteroestruturas e dispositivos semicondutores baseados em materiais bidimensionais (2d)
• Beneficiário: Yara Galvão Gobato
• Modalidade de apoio: Bolsas no Exterior - Pesquisa
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs