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, Enrico; Bettinelli, M.. - In: OPTICAL MATERIALS. - ISSN 0925-3467. - 28:(2006), pp. 9-13. [10.1016/j.optmat.2004.09.027]
Making red-emitting phosphors with Pr3+
CAVALLI, Enrico;
2006-01-01
Abstract
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.File | Dimensione | Formato | |
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