Preparation method of thulium and europium single/co-doped lutetium gallium garnet phosphor

Abstract

The invention provides a preparation method of a thulium and europium single / co-doped lutetium gallium garnet phosphor. The chemical formula of the phosphor is Lu (3-x-y) Ga5O12: xEu<3+>, yTm <3+>, wherein x=0-0.04, y=0-0.02, and x and y cannot be zero simultaneously. A low temperature combustion method is adopted to realize uniform mixing on an ion level, the obtained product is foamy and loose, is not agglomerated and is easy in ball milling, and the color purity of the product is high. The furnace temperature of the method is greatly reduced, the production process is simple and convenient, and the method is an efficient energy-saving synthetic method. The obtained phosphor has narrow emission peak, and a half-height peak width is only 4-5nm, furthermore, under a 241nm light excitation, the phosphor can emit light with different colors, emits orange light when Eu<3 +> is singly doped, emit blue light when Tm<3+> is singly doped, emits white light when Eu<3 + >and Tm<3 +> are in a co-doped state, and white light emission is finally realized by compounding with an ultraviolet LED chip.

Description

technical field [0001] The invention belongs to the technical field of light-emitting materials, and in particular relates to a preparation method of lutetium-gallium garnet (LGG) fluorescent powder single / co-doped with thulium and europium for white light-emitting diodes. Background technique [0002] White light LED has the advantages of less energy consumption and no pollution. It is called the fourth generation lighting source and has broad application prospects. [1] . At present, there are three main methods to realize white LED [2] : One is the phosphor light conversion method, which uses the blue light emitted by the GaN-based chip to excite YAG:Ce 3+ Phosphor, the light emitted by the chip and the phosphor are mixed to form white light; the second is the multi-chip method, using LED chips of three colors, red, green and blue, using the principle of three primary colors, and combining them according to a certain ratio to emit white light; the third is integrated sin...

AI Technical Summary

Problems solved by technology

However, these products prepared by the co-precipitation method also have some disadvantages: ① Due to the difference in solubility product and sedimentation rate, it is difficult to form a precursor powder with an accurate stoichiometric ratio and uniform components; ② It is difficult to control the appropriate pH value to make the mixed solution The cations are completely precipitated at the same time; ③The obtained precursor powder may be agglomerated during the washing and drying process

Images