Europium doped lanthanide silicon oxynitride and preparation method thereof

Abstract

The invention discloses a europium doped lanthanide silicon oxynitride, of which the chemical general formula is La5-5xEu5xSi3O12N, wherein x is more than 0 and less than 0.25. The preparation method comprises the steps of: (a) weighing raw materials: lanthanum trioxide, silicon dioxide, silicon nitride and europium oxide, according to the molar ratio of the chemical formula La5-5xEu5xSi3O12N (x is more than 0 and less than 0.25); (b) ball-milling the raw materials and tabletting; (c) putting tablets into a high temperature furnace, under the nitrogen hydrogen atmosphere, raising the furnace temperature to 1000-1250 DEG C, and sintering for 3-10 hours; (d) turning off a hydrogen source, under the environment of charging nitrogen gas, keeping the high temperature furnace at a pressure of 0.5-1MPa, raising the furnace temperature to 1450-1550 DEG C, and continuously sintering the tablets for 3-10 hours; and (e) ventilating to release the pressure in the furnace to be an ordinary pressure, cooling down the high temperature furnace to room temperature by circulating under the nitrogen-hydrogen mixed atmosphere, taking out the sample tablets, and grinding, thus obtaining a fluorescent material. The fluorescent material prepared by the preparation method is stable in physicochemical property, convenient to control luminescence property, simple in preparation method, and free from environmental pollution, and is applicable to industrialized mass production.

Description

technical field [0001] The invention relates to a fluorescent material containing rare earth metals and a preparation method thereof, in particular to a europium-doped lanthanide silicon oxynitride compound and a preparation method thereof. Background technique [0002] White light LED has attracted widespread attention due to its small size, energy saving, environmental protection, long life and other advantages, and is called a new generation of lighting sources. At present, white light LED lighting is mainly realized through light conversion, that is, through blue light chips to excite yellow phosphor powder, blue and yellow light are mixed to obtain white light, or purple light (or ultraviolet light) is used to excite red, green, and blue phosphor powder, red, green, and blue phosphors. Green and blue light mix into white light. For this reason, technicians have developed a variety of fluorescent materials capable of displaying various colors of visible light under ligh...

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Problems solved by technology

Disclosed as CN101434839A is a kind of nitrogen oxide fluorescent powder doped with europium, the chemical general formula of this fluorescent powder is {M (1-x) Eu x } a Si b o c N d , where M is Ba, Sr or Ca, 02 ON:Eu 2+ Phosphor powder and its preparation method are: uniformly mixing raw materials, drying, filtering, calcining and pulverizing to obtain (Ca, Mg)Si which can emit yellow-green light 2 ON:Eu 2+ Phosphor powder; and in the existing research, Eu has not been found 2+ Doping in La-Si-O-N matrix to prepare related reports of fluorescent compounds that can emit blue-green light

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