Cold white light emission in tellurite-zinc glasses doped with Er3+-Yb3+-Tm3+ under 980 nm

Author(s)

Lozano, G. ; Silva, O. B. ; Faria, W. ; de Camargo, A. S. S. ; Goncalves, R. R. ; Manzani, D. ; Bruna, R. ; Rivera, V. A. G. ; Marega, E.

• Document type: Journal article
• Source: Journal of Luminescence; v. 228, p. 10-pg., 2020-12-01.

Abstract

Tellurite-zinc glasses doped with Er3+, Yb3+ and Tm3+ were fabricated by conventional melt-quenching technique and characterised by absorption spectroscopy, refractive index, lifetime measurements, excitation, luminescence and up-conversion spectroscopy. Tunable blue to cold white light emission based on the colour mixing of red, green and blue light was obtained 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 that produce the white light. The Judd-Ofelt intensity parameters (Omega(2), Omega(4) and Omega(6)) were calculated for all samples and present the trend Omega(2)>Omega(4)>Omega(6). The spectroscopic parameters were computed with the Judd-Ofelt theory as well as the energy transfer micro-parameters (critical radius of interaction and energy transfer coefficient). Such results shall be used to give a comprehensive explanation for the energy transfer process between these rare earth ions. (AU)

• FAPESP's process: 13/07276-1 - CEPOF - Optics and Photonic Research Center
• Grantee: Vanderlei Salvador Bagnato
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC