Abstract
Novel Cd2V2O7:Re3+, Li+ (Re = Pr, Sm) red phosphors were synthesized using a high-temperature solid state reaction, where Li+ was utilized as a charge compensator for luminescence enhancement. X-ray diffraction indicated that all the as-prepared samples had Cd2V2O7 pure phase and their structures remained unchanged with Re3+ and Li+ doping. Emission spectra of Cd2V2O7:Pr3+ phosphors excited at 380nm revealed an orange-red emission with two apparent peaks at 580nm and 620nm, corresponding to the 1D2→3H4 and 3P0→3H6 electronic transitions of Pr3+. The emission spectra of Sm3+ doped Cd2V2O7 phosphors showed one strong peak at 607nm and two weak peaks at 572nm and 654nm, attributed to 4G5/2→6H7/2, 4G5/2→6H5/2 and 4G5/2→6H9/2 transitions, respectively. Moreover, the luminescence intensities of Cd2V2O7:Re3+ (Re = Pr, Sm) samples were enhanced observably by Li+ ions doping with charge compensation effect. Overall, these findings suggested that Cd2V2O7:Re3+, Li+ (Re = Pr, Sm) red phosphors can be used as a promising red component in near ultraviolet-excited white light-emitting diodes with improved performances.
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