Photon down-shifting by energy transfer from Sm 3+ to Eu 3+ ions in sol-gel SiO 2-LaF 3 nano-glass-ceramics for photovoltaics

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