1.5μm Emission and infrared-to-visible frequency upconversion in Er+3/Yb+3-doped phosphoniobate glasses

• Published in: Journal of non-crystalline solids Vol. 352; no. 32-35; pp. 3636 - 3641
• Main Authors: Barbosa, A.J., Dias Filho, F.A., Messaddeq, Y., Ribeiro, S.J.L., Gonçalves, R.R., Lüthi, S.R., Gomes, A.S.L.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-09-2006
• Subjects: Absorption; Glasses; Laser–matter interactions; Luminescence; Optical spectroscopy; Phosphates; Rare-earths in glasses; Upconversion; 78.30.Ly; Phosphates; Optical spectroscopy; Upconversion; Absorption; Laser–matter interactions; Rare-earths in glasses; 78.60.−b; Luminescence; 78.55.−m; Glasses; 71.23.Cq
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2006.03.095

Sodium phosphoniobate glasses with the composition (mol%) 75NaPO3–25Nb2O5 and containing 2mol% Yb3+ and x mol% Er3+ (0.01⩽x⩽2) were prepared using the conventional melting/casting process. Er3+ emission at 1.5μm and infrared-to-visible upconversion emission, upon excitation at 976nm, are evaluated as a function of the Er3+ concentration. For the lowest Er3+ content, 1.5μm emission quantum efficiency was 90%. Increasing the Er3+ concentration up to 2mol%, the emission quantum efficiency was observed to decrease to 37% due to concentration quenching. The green and red upconversion emission intensity ratio was studied as a function of Yb3+ co-doping and the Er3+–Er3+ energy transfer processes.