The Eu3+ doped YBO3 was prepared by the novel aldo-keto method. The structure and VUV luminescence properties of the title compound were studied and compared to the corresponding properties of the materials prepared by a conventional solid state reaction. The use of novel aldo-keto method in preparation lowered the reaction threshold temperature by c.a. 300oC. The YBO3 phosphor from the aldo-keto method look like evenly sized spherical structures, whereas those from the solid-state process look like some agglomerates of little spheres. The Eu3+-doped YBO3 phosphors prepared by both methods showed the red emission with peak around 592, 611 and 627 nm at excitations wavelengths 147 and172 nm, which corresponds to the transitions from the excited 5D0 level to the 7FJ (J = 1, 2, 3, 4) levels of Eu3+ activators. However, the emission intensity of the Eu3+ doped YBO3 from the aldo-keto system is about 2 times as much as that from the sold-state process.
Tb doped AZr 2 (PO 4 ) 3 (AZP) green phosphors were synthesized by novel solution combustion method and the excitation spectra of pure compound in the vacuum ultraviolet (VUV) regions are investigated. The VUV characteristic was optimized by Tb 3+ concentration and by alkali metals A + (Li, Na, K) contents. The concentration quenching was observed when the concentration of Tb 3+ was 2.0 at % of Zr 2 . The band ranging from 130 to 160 nm in excitation spectra is due to the absorption band of host lattice or PO 4 groups; the band at 160-200 nm is related to the charge transfer (CT) transition of O-Zr. The strong band at 225 nm and the weak band at 261 nm in the excitation spectra are assumed to the spin-allowed and spin-forbidden f-d transitions (4f 8 → 4f 7 5d 1 ) of Tb 3+ .The excitation and emission spectra indicate that the phosphors can be effectively excited by 147 nm and 172 nm and demonstrated a satisfactory green light performance. The high luminescent intensity, excellent color purity and chemical stability of AZr 2 (PO 4 ) 3 :Tb 3+ make it an attractive green emitting phosphors for mercury free luminescent lamp and plasma display panel. The prepared phosphor sample was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and Vacuum ultraviolet spectra were studied.
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