Whole color fluorescent material and preparation method thereof

Abstract

This invention relates to a panchromatic luminescent material, formulae is LiYZrO:Eu3+, Dy3+, R3+. The R represents B3+ or mixture of any kinds of rare earth ion and B3+ ion. The process: dissolve lithium nitrate, yttrium nitrate, zirconium nitrate, europium nitrate, dysprosium nitrate and boric acid or mixture of any rare earth nitrate and boric acid in de-ionized water, then add urea and citric acid to above solution, heat and whip, then by agglutination to gain product. This luminescent material is panchromatic blazing, has high emissive power, uniformity phase, small granularity, belong to nanometer level, and has good chemical stability.

Description

technical field [0001] The invention relates to a full-color fluorescent material and belongs to the technical field of luminescent materials. technical background [0002] Since Edison invented the incandescent lamp in 1882, artificial lighting sources have gone through three stages of development: incandescent lamps, neon lamps, and gas discharge lamps. In 1993, Japan first made a technological breakthrough on blue GaN light-emitting diodes, and realized white LEDs in 1996. In recent years, it is heading towards the fourth development stage of lighting sources—the direction of white LED-based semiconductor lighting sources. develop. Because white LEDs do not contain mercury, they have the advantages of power saving, environmental protection, and long life. They are known as "green lighting sources" and can be widely used in communications, electronics, automobiles, photoelectric displays and other industries, and will gradually replace traditional lighting equipment. [...

AI Technical Summary

Problems solved by technology

However, this method also has a very serious disadvantage, that is, as the input power increases, the heat generation of the LED increases, which increases the temperature of the chip, resulting in a decrease in the reliability of the LED and a decrease in the light output efficiency.

[0004] It can be seen from the above situation that whether the principle of complementary colors or the principle of mixing three primary colors is used, the luminous efficiency of white LEDs will be reduced, and there is a problem of unstable color rendering index.

In addition, the preparation of existing luminescent materials is mostly achieved by solid-state sintering, which has a high sintering temperature (higher than 1300°C), wastes energy, and has the disadvantage of uneven distribution of luminescent centers in the matrix.