Blue light phosphor powder for white light LED and preparation method thereof, and white light LED light emitting device

Abstract

The invention discloses white light LED blue light fluorescent powder. The chemical composition formula of the white light LED blue light fluorescent powder is Ca1-xSr1-xSi1-yAlyO4: xCe3+, xLi+. In addition, the invention further discloses a preparation method for the blue light fluorescent powder and a white light LED lightening device using the blue light fluorescent powder. The white light LED blue light fluorescent powder has the advantages that the luminance degree is high, the chemical stability and the temperature quenching performance are good, and the motivating and the transmitting ranges are wide. The white light LED blue light fluorescent powder is combined with red light fluorescent powder and green light fluorescent powder in the prior art, a series of high-efficient white light of different color temperatures can be obtained under ultraviolet excitation, and the requirement of the general illumination field on different types of light sources can be met, and meanwhile the white light LED blue light fluorescent powder has the advantages that the color development performance is good, the energy conversion rate is high, the color temperature homogeneity is good, and luminance decrease is not prone to occurring.

Description

technical field [0001] The invention belongs to the technical field of light-emitting materials and relates to a blue-light fluorescent powder for white-light LEDs, a preparation method thereof, and a white-light LED light-emitting device. Background technique [0002] In recent years, white LED, as a new type of solid-state lighting source, has attracted people's attention due to its advantages of environmental protection, energy saving, high reliability, and long life. Its many advantages have been widely used in many fields such as general lighting, signal lights, and liquid crystal display background light sources, and it is expected to replace various bulbs and fluorescent lamps currently used and become a new generation of green lighting sources. [0003] At present, the light-converting white light LED that can be industrialized uses the blue light GaN tube core to pump YAG:Ce 3+ Yellow phosphor is obtained; this kind of white light LED has a simple manufacturing pri...

AI Technical Summary

Problems solved by technology

However, due to the poor stability of sulfide and the ability to resist ultraviolet radiation, the service life of white LEDs is not long; at the same time, this type of phosphor is sensitive to humidity and has poor stability

Secondly, the silicate system blue phosphor has good chemical stability and thermal stability, but the color rendering index of the packaged product is generally not high

Thirdly, the silicon-based nitrogen (oxide) oxide system blue phosphor has a wide excitation wavelength, good temperature stability, and excellent luminous performance; however, this type of phosphor requires harsh conditions such as high temperature and high pressure during the preparation process, which increases safety hazards

Fourth, the phosphate system blue light phosphor has high luminous efficiency and good stability; however, this kind of phosphor needs to be prepared by high-temperature solid-phase synthesis technology and flame spray pyrolysis technology, the conditions are relatively harsh, and the cost is high

Fifth, the aluminate system blue phosphor has high brightness, wide emission peak, and low cost; however, there are problems such as high synthesis temperature and large phosphor particle size in industrial production, which seriously hinder the development of aluminate system blue phosphors. Further applications in white LEDs

[0005] On the other hand, white LEDs packaged with the above-mentioned blue phosphors and red and green phosphors usually have a narrow half-width of the emission spectrum due to the different phosphor systems used, resulting in generally low display index of the packaged products.

At the same time, blue phosphors often have light decay in packaged white LEDs.

Images