Gadolinium thulium vanadate/borate blue light-emitting material and preparation method thereof

Abstract

The invention provides a gadolinium thulium vanadate / borate blue light-emitting material. The material is characterized in that the chemical formula is Gd1-y(VO4)x(BO3)1-x:Tmy; and in the formula, x is not less than 0.1 and not more than 0.9 and y is not less than 0.01 and not more than 0.05. In a preparation method of the material, ammonium metavanadate, gadolinium nitrate, thulium nitrate, boric acid and citric acid are selected as raw materials, and the preparation method comprises the following steps: (1) putting ammonium metavanadate and boric acid into a container, adding deionized water to form a solution defined as solution A, putting gadolinium nitrate, thulium nitrate and citric acid into the container, adding deionized water to form a solution defined as solution B, adding the solution A to the solution B, stirring the solution uniformly, thus forming sol, adjusting the pH value of the sol to be not less than 4 and not more than 10, continuing stirring at 60-80 DEG C until gel is formed and then drying the gel, thus obtaining a precursor; (2) grinding and dispersing the precursor, then roasting the product at normal pressure and 700-900 DEG C for 1-4 hours, then taking out the product and air-cooling the product; and (3) grinding and dispersing the roasted product, then washing the product and drying the washed powder.

Description

Technical field [0001] The invention belongs to the field of luminescent materials, and particularly relates to a rare earth blue luminescent material and a preparation method thereof. Background technique [0002] Rare earth vanadate luminescent materials have high thermal and chemical stability, especially stable luminous efficiency and high energy transfer efficiency under vacuum ultraviolet irradiation. They are mainly used for fluorescent materials in the fields of PDP and FED and high-pressure mercury lamps. Phosphor material. At present, the most researched is the use of Eu activated red luminescent materials, such as the commonly used YVO 4 : Eu, and then add P, Gd and other elements on the basis of modified red luminescent materials. The preparation method of the luminescent material is mainly the solid phase sintering method, and the particle size of the obtained product is on the order of microns. There are few blue luminescent materials, the blue luminescent powder ...

AI Technical Summary

Problems solved by technology

There are few blue luminescent materials, and the blue luminescent powder on the market is mainly Eu 2+ Activated aluminate phosphors such as BaMgAl 10 o 17 :Eu 2+ (BAM), which is the blue powder used more in compact fluorescent lamps at present, the heating process of the powder takes a long time, ultraviolet radiation and ion bombardment are easy to cause aging, resulting in reduced luminous performance

In addition, this finished blue powder needs to be produced in a reducing atmosphere, and sometimes the luminous intensity will be reduced due to insufficient reduction

In addition, the raw material of the activator Eu is high-purity Eu 2 o 3 , high product cost

Hu Bin et al disclosed a method to prepare GdVO by sol-gel method 4 : The method and luminescent properties of the blue luminescent material of Tm (see Rare Metal Materials and Engineering, 37(1), 176-179), but the size uniformity of the luminescent powder particles prepared by this method is poor, and the shape is irregular , which will affect the luminous intensity

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