Yb3+ concentration influences UV–Vis to NIR energy conversion in nanostructured Pr3+ and Yb3+ co-doped SiO2-Nb2O5 materials for photonics - Muscelli, Wesley Cardoso; Aquino, Felipe Thomaz; Caixeta, Fábio José; Nunes, Lucas Rafael Rodrigues; Zur, Lidia; Ferrari, Maurizio; Gonçalves, Rogéria Rocha (Journal of Luminescence, 2018)