UV-excited red-emitting phosphors are obtained using Pr3+ as the luminescent activator and host lattices containing closed-shell transition metal ions (especially titanates, vanadates and niobates). In these oxidant lattices, the quenching of the otherwise greenish- blue emitting 3P0 level is induced by a low-lying Pr-to-metal intervalence charge transfer state (IVCT). A simple criterion based on the optical electronegativities of the d0 lattice cations (Mn+) and average Pr3+ Mn+ distances is proposed to predict 3P0 quenching in these lattices.
Making red-emitting phosphors with Pr3+ / BOUTINAUD P.; PINEL E.; OUBAHA M.; MAHIOU R.; CAVALLI E.; BETTINELLI M.. - In: OPTICAL MATERIALS. - ISSN 0925-3467. - 28(2006), pp. 9-13. [10.1016/j.optmat.2004.09.027]