Preparation method of white-light phosphor

Abstract

The invention relates to a preparation method of white-light phosphor, which adopts strontium nitrate, cerium nitrate, dysprosium nitrate, and europium nitrate as raw materials, adopts acrylamide as a monomer lattice reagent, adopts N-N' methylene diacrylamide as a cross-linking agent, adopts ammonium persulfate as an initiator, and adopts deionized water as a solvent medium; the raw materials are mixed, heated and stirred, gelated at a liquid phase, dried, calcined at a high temperature, cooled, grinded, sieved, and detected for analysis; finally white-light phosphor white powder is prepared; the product has excellent luminescent properties, a small particle size, and good dispersibility; the preparation method uses less equipment, has a short process flow, does not cause environment pollution, has a high product yield of up to 96%, and is a very ideal preparation method of white-light phosphor.

Description

technical field [0001] The invention relates to a method for preparing white light-emitting fluorescent powder, and belongs to the technical field of methods for preparing rare earth inorganic oxide luminescent materials. Background technique [0002] Light-emitting diode LED is a new type of solid-state light source with high efficiency and energy-saving advantages. It is a new generation of light-emitting light source and has been widely used in mobile phones, cameras, display screens, and indicator lights. [0003] According to the principle of luminescence, there are mainly the following ways to achieve white light with phosphor powder for LED: blue LED chip + yellow phosphor powder are combined to form a white LED; the blue LED chip is coated with green and red phosphor powder, and the blue light and fluorescent powder emitted by the chip The green light and red light emitted by the powder are combined to obtain white light; the three primary colors of red, yellow and b...

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Problems solved by technology

[0003] According to the principle of luminescence, there are mainly the following ways to achieve white light with phosphor powder for LED: blue LED chip + yellow phosphor powder are combined to form a white LED; the blue LED chip is coated with green and red phosphor powder, and the blue light and fluorescent powder emitted by the chip The green light and red light emitted by the powder are combined to obtain white light; the three primary colors of red, yellow and blue phosphor powder are coated on the purple or ultraviolet LED chip, and the long-wave ultraviolet light emitted by the chip is 370nm~380nm or the purple light is 380nm~410nm To excite the phosphor powder to achieve white light emission; however, the luminous efficacy of the obtained phosphor powder is not high enough, and it will decrease with the increase of temperature. The degree of decline of different LEDs is very different, which often causes the color difference of mixed white light, making the three primary color LEDs Applications for assembly to achieve white light are limited

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