Preparation And Luminescence Properties Of Red Vanadate Phosphor Doped With B And P

Vanadate was considered as an excellent phosphor host materials, because it had larger absorption cross section in the vacuum ultraviolet,and had a sensitized valid matrix. It was found that vanadium borates and phosphate coud improve the red phosphors'purity and luminous intensity when it was used as phosphor host materials. This all part samples of the experiment were prepared by chemical coprecipitation. First it prepared vanadate yttrium red phosphor doped by rare earth Eu³⁺ and Gd³⁺, and studied the influence of concentration of Gd³⁺ on the Eu³⁺ features luminescence. Second it prepared borate vanadium yttrium red phosphor doped by rare earth Eu³⁺ and Gd³⁺, it studied the preparation of vanadium borate red phosphor by through researched the influencing factors on luminescent intensity such as B/V ratio, pH, temperature, precipitation and calcination temperature. Also it prepared vanadium phosphate yttrium red phosphor doped by rare earth Eu³⁺ and Gd³⁺, it studied the preparation of vanadium borate red phosphor by through researched the influencing factors on luminescent intensity such as P/V ratio, pH, temperature, precipitation and calcination temperature. The X-ray diffraction, scanning electron microscopy, TGA and photoluminescence were used to study the phase structure of the phosphor, the morphology, crystallization temperature and element content of the powder.The results indicated that the emission of Eu³⁺ was relatively the strongest under certain conditions: Eu³⁺ and Gd³⁺ in the molar concentrations were 0.04% mol/ml and 0.06% mol/ml. The borate vanadium yttrium red phosphor doped by rare earth Eu³⁺ and Gd³⁺ was a mixture with spherical particles, under preparation conditions calcined at 1200℃, pH=7, water bath temperature 70℃, B/V=0.7/0.3. The vanadium phosphate yttrium red phosphor doped by rare earth Eu³⁺ and Gd³⁺ was a solid solution with spherical particles, under preparation conditions calcined at 900℃, pH=7, water bath temperature 70℃, P/V=0.8/0.2. The emission of Eu³⁺ was enhancement when B and P were doped in the yttrium vanadate matrix.