Abstract
Ce3+-activated Sr5-2x-yBay(PO4)3Cl:xCe3+,xNa+ phosphors were synthesized via the solid statereaction methods. The substitution of Ba2+ for Sr2+ ions was confirmed by Raman spectra. The broadest Raman width in Sr2.45Ba2.45(PO4)3Cl:Ce3+ phosphor supported its highest disorder of the host lattice, leading to the emission spectral broadening with a half width of 95.5 nm due to the larger variation in crystal filed strength. The thermal stability of the luminescence was evaluated by the temperature-dependent luminescence intensity. The simulating a spectra of blue-emitting Sr2.45Ba2.45(PO4)3Cl:0.05Ce3+,0.05Na+ and orange emitting Sr3SiO5:Eu2+ phosphors as light converters, an intense white GaN-based near-UV-LED (400 nm) was exhibit good color-rendering index Ra of 90.8 at a correlated color temperature of 6473 K and CIE coordinates of (0.3165, 0.3051). These characteristics makes Sr2.45Ba2.45(PO4)3Cl: 0.05Ce3+,0.05Na+ should be a promising blue-emitting phosphors for the production of white light in phosphor conversion white-LEDs.
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