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White light emission under 980 nm and Judd-Ofelt analysis of tellurite-zinc glasses doped with Er3+-Yb3+-Tm3+

Calderón, Gaston Lozano

Biblioteca Digital de Teses e Dissertações da USP; Universidade de São Paulo; Instituto de Física de São Carlos 2020-02-20

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  • Título:
    White light emission under 980 nm and Judd-Ofelt analysis of tellurite-zinc glasses doped with Er3+-Yb3+-Tm3+
  • Autor: Calderón, Gaston Lozano
  • Orientador: Marega Junior, Euclydes
  • Assuntos: Conversão Ascendente; Transferência De Energia; Judd-Ofelt; Luz Branca; Terras Raras; Micro-Parâmetros; Telurito; Up-Conversion; Tellurite; Rare-Earths; Micro-Parameters; Energy Transfer; White Light
  • Notas: Dissertação (Mestrado)
  • Descrição: In this dissertation, tellurite-zinc glasses doped with Tm3+, Yb3+ and Er3+ were fabricated by conventional melt-quenching method and characterized by absorption spectroscopy, refractive index, lifetime measurements, excitation, luminescence and up-conversion spectroscopy. Tunable white to blue light emission based on the colour mixing of red, green and blue light was observed in the triply-doped samples via up-conversion under 980 nm and by adjusting the laser excitation intensity. The balancing of the relative intensity of each colour is provided by the energy transfer process between the rare-earth ions. Moreover, luminescence spectroscopy was performed with a 405 nm laser to further understand the energy transfer mechanism. According to the Judd-Ofelt theory, the intensity parameters (Ω2, Ω4 and Ω6) of Er3+ and Tm3+ for all samples present the trend Ω2 < Ω4 < Ω6. These parameters are related to the bonding and local structure in the vicinity of the rare-earth ions, which give information regarding to physical and chemical properties. The spectroscopic parameters were calculated with the Judd-Ofelt theory and the energy transfer micro-parameters (critical radius of interaction and energy transfer coefficient) were determined by the Dexter model. Such results shall be used to give a comprehensive explanation for the energy transfer process between these rare earth ions.
  • DOI: 10.11606/D.76.2020.tde-15052020-133107
  • Editor: Biblioteca Digital de Teses e Dissertações da USP; Universidade de São Paulo; Instituto de Física de São Carlos
  • Data de criação/publicação: 2020-02-20
  • Formato: Adobe PDF
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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