Pr, Eu/Tb co-doped tungstate/molybdate fluorescent powder and preparation method thereof

Abstract

The invention discloses a Pr, Eu / Tb co-doped tungstate / molybdate fluorescent powder. The chemical composition of the fluorescent powder is Al-x-yBO4:xPr, yTb / Eu, wherein an A element is one or more selected from Ca, Ba and Sr; a B element is W or Mo; x is more than 0.01 but less than or equal to 0.10; and y is more than 0.01 but less than or equal to 0.10. A preparation method thereof comprises the following steps: mixing the carbonate or oxide of the A element and the ammonium salt of tungstic acid / molybdic acid with the oxide of the Pr, Tb or Eu in the proportion of mole ratio of A:BO4:Pr:Tb / Eu being (1-x-y):1:x:y; mixing with less absolute ethyl alcohol; fully grinding and uniformly mixing, thereby obtaining a mixture; and sintering at high temperature, crushing, grinding and drying, thereby obtaining the fluorescent powder. Under the excitation of ultraviolet light (especially being 210nm-250nm), the sample of the fluorescent powder respectively emits 485nm blue light, 585nm yellow light, 545nm green light, and 612nm and 645nm red light; the green light, yellow light and white light can be respectively obtained by adjusting the variety and concentration of the doped rare earth Pr, Eu and Tb ions; and the preparation method is suitable for the preparation of the high-light white light LED fluorescent powder.

Description

Technical field [0001] The invention belongs to the technical field of rare earth luminescent materials. Specifically, the invention relates to a Pr, Eu / Tb co-doped tungsten / molybdate phosphor and a preparation method thereof. Background technique [0002] White light-emitting diodes have the advantages of high luminous efficiency, energy saving, stability, and environmental protection. They overcome the shortcomings of traditional incandescent lamps and fluorescent lamps, such as high power consumption, fragility, and mercury pollution from discarded materials. They were once called "green lighting sources". "The application prospect is very broad. According to the principle of photometry, white light can be obtained by three schemes. (1) It is composed of a mixture of blue, green and red light; (2) is a mixture of blue and yellow light; (3) is a combination of multi-primary light. Red, green, and blue LEDs emit light. Because the light output of the device is greatly affected...

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Problems solved by technology

CN 102676165A reports a fluorescent powder for alkaline earth borate white light LED and its preparation method, which solves the technical problems of low light effect, poor stability, environmental pollution and low service life of traditional fluorescent powder

CN 102277166A clarifies aluminum magnesium phosphate phosphors co-doped with europium ions and manganese ions and its preparation method, which overcomes the disadvantages of narrow traditional fluorescent pink domain, the need for compounding of various phosphors, and high cost and complicated preparation methods

However, there is still a lack of phosphors with excellent performance, good thermal and chemical stability, wide color gamut, and can be excited by ultraviolet and blue light on the market.

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