Spectroscopic study of the 4fn-15d transitions of LaPO4 doped with Pr3+ or co-doped with Pr3+ and Gd3+ in the Vacuum Ultra Violet region - Hilario, Eloisa Garibalde; Rodrigues, Lucas Carvalho Veloso; Caiut, José Maurício Almeida (Nanotechnology, 2022)