Spectroscopic characterization and up-conversion in sol-gel derived Yb 3+-Pr3+ co-doped SiO2-LaF3 nano-glass-ceramics

1. Velázquez, J.J.
2. Yanes, A.C.
3. Del-Castillo, J.
4. Méndez-Ramos, J.
5. Rodríguez, V.D.