Blue light excited green fluorescent powder for white light light-emitting diode (LED) and preparing method thereof

Abstract

The invention relates to a blue light excited green fluorescent powder for a white light LED and a preparing method thereof. The fluorescent powder can be used for manufacturing white LEDs, the excitation spectrum range is between 350 nanometers and 540 nanometers, and the emission spectrum range is between 450 nanometers and 700 nanometers. The structural formula of the fluorescent powder is MaScbSicOd:Cex, wherein, M is composed of at least one of Ca, Sr and Ba, a, b, c, d and x are molar coefficients, and the ranges are respectively: 2<=a<=4, 1<=b<=3, 2<=c<=4, 9<=d<=13, 0.001<=x<=0.2, 4<=(a+b+x)<6, and 11<(c+d)<16. The preparing method includes preparing raw materials according to the structural formula MaScbSicOd:Cex and stoichiometric numbers, adding fluxing agents into the materials, subjecting the mixture to wetting and mixing with deionized water, ball milling, stoving, reduction roasting and post-processing to obtain the material. The blue light excited green fluorescent powder for the white light LED has the advantages that the luminance is high, the particle size is uniform, the excitation wavelength is wide, the emission wavelength can be adjusted according to needs, the chemical stability is good, and the like; and the preparing method is simple, pollution-free, and low in cost.

Description

technical field [0001] The invention relates to a green fluorescent powder for white LEDs excited by blue light, and provides a preparation method of the fluorescent powder, which belongs to the field of luminescent materials or the field of semiconductor lighting. Background technique [0002] White LEDs can be obtained by coating highly efficient phosphors that can be effectively excited by blue light and emit yellow light on the blue LED chips. The successful research of white LED light source has created conditions for the application of LED in general lighting. White light LED is also known as the fourth-generation green lighting source. Compared with traditional incandescent and fluorescent lamps, it has many advantages: such as solidification, small size, long life, durability, stable performance, fast luminous response, impact resistance, etc. , so it is widely used in general lighting, indicator lights, signal lights and other fields. [0003] There are many ways ...

AI Technical Summary

Problems solved by technology

Specifically, the blue LED chip plus YAG:Ce 3+ The method of yellow phosphor has been commercialized, but its color rendering is poor

The second is to coat green and red phosphors on the blue LED chips, but the efficiency of the red phosphors needs to be greatly improved

Although the green fluorescent powder described in this patent has a wide range of excitation spectrum, the luminous intensity of the green fluorescent material is relatively weak

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