Valence control of Pr in 'ZR''O IND. 2' nanocrystals by aliovalent 'GD IND. 3+' co-doping - Carvalho, José Miranda de; Lastusaari, Mika; Rodrigues, Lucas Carvalho Veloso; Hölsa, Jorma; Felinto, Maria Claudia França da Cunha; Brito, Hermi Felinto de (Journal of Luminescence, 2016)