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A series of tunable phosphors NaAlSiO_4:Ce~(3+),Sm~(3+) were synthesized using a conventional high-temperature, solid-state method. Crystal structure, photoluminescence excitation, and emission spectra with fluorescence decay curves were investigated. Under UV excitation(325 nm), NaAlSiO_4:Ce~(3+),Sm~(3+) showed strong blue emission located at 444 nm and orange-reddish emission centered at 563, 601, 648 and 712 nm, stemming from the characteristic emission for 4f-5d transition of Ce~(3+) and ~4G_(5/2)→~6H_J(J=5/2, 7/2, 9/2, 11/2) transition of Sm~(3+), respectively. In addition, we studied the detailed energy transfer process between Ce~(3+) and Sm~(3+) and found that it belonged to dipole-dipole resonance energy transfer. Furthermore, we noted that the white light emitting from the Ce~(3+), Sm~(3+) co-doped phosphors with the color coordinate(x=0.313, y=0.283) could be observed under 325 nm excitation, which was close to the ideal white light(x=0.33, y=0.33). The results indicated that this phosphor has a potential application as a single-phased alumino-silicate phosphor for ultraviolet white light-emitting diodes(UV-WLEDs).
A series of tunable phosphors NaAlSiO_4: Ce ~ (3 +), Sm ~ (3+) were synthesized using a conventional high-temperature, solid-state method. Crystal structure, photoluminescence excitation, and emission spectra with fluorescence decay curves were investigated. Under UV excitation (325 nm), NaAlSiO_4: Ce ~ (3 +), Sm ~ (3+) showed strong blue emission located at 444 nm and orange-reddish emission centered at 563, 601, 648 and 712 nm, stemming from the characteristic emission for 4f-5d transition of Ce ~ (3+) and ~ 4G_ (5/2) → ~ 6H_J (J = 5/2, 7/2, 9/2, +), respectively. In addition, we studied the detailed energy transfer process between Ce ~ (3+) and Sm ~ (3+) and found that it belonged to dipole-dipole resonance energy transfer. emitting from the Ce ~ (3+), Sm ~ (3+) co-doped phosphors with the color coordinate (x = 0.313, y = 0.283) could be observed under 325 nm excitation, which was close to the ideal white light x = 0.33, y = 0.33). The results showed t hat this phosphor has a potential application as a single-phased alumino-silicate phosphor for ultraviolet white light-emitting diodes (UV-WLEDs).