Full-spectrum phosphor powder for white light LED, preparation method thereof, and white light LED light-emitting device

Abstract

The invention discloses full-spectrum fluorescent powder for a white LED. The chemical composition formula of the full-spectrum fluorescent powder is Ca0.94Zn1-xOS:0.03Ce3+, 0.03Na+ and xMn2+. In addition, the invention discloses a preparation method of the fluorescent powder and a white LED light-emitting device adopting the fluorescent powder. The full-spectrum fluorescent powder for the white LED is high in light-emitting brightness, good in chemical stability and temperature quenching property and wide in motivating and emitting range. A series of efficient white light with different color temperatures can be obtained under blue light motivation, the need of the common illumination field for different kinds of light sources can be met, and the advantages of being good in color display performance, high in energy conversion rate, good in color temperature uniformity and not likely to cause light degradation are achieved.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and relates to an LED phosphor, a preparation method thereof, and a light-emitting device, and more specifically, to a full-spectrum phosphor for white LEDs, a preparation method thereof, and a white 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] White light is a kind of mixed color light. The realization of white light can adopt the principle of different color matching, and mix ...

AI Technical Summary

Problems solved by technology

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

Secondly, silicon-based nitride (oxide) oxide system phosphors have wide excitation wavelength, good temperature stability, and excellent luminescence performance; however, this type of phosphor requires harsh conditions such as high temperature and high pressure during the preparation process, which increases safety hazards

Thirdly, the phosphate system 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, and the conditions are also relatively harsh and the cost is high

Fourth, the aluminate system phosphor has high brightness, wide emission peak, and low cost; however, there are problems such as high synthesis temperature and large particle size of phosphor in industrial production, which seriously hinder its further application in white LEDs

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

[0006] On the other hand, white LEDs packaged with the above-mentioned 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, full-spectrum phosphors often have light decay in packaged white LEDs.

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