Ultraviolet excited white light LED containing double-color fluorescent powder and preparation method thereof

Abstract

The invention discloses an ultraviolet excited white light LED containing double-color fluorescent powder. The white light LED comprises a UVLED chip and a double-color fluorescent powder colloid formed by mixing of yellow fluorescent powder, blue fluorescent powder and fluorescent powder glue, the UVLED chip is coated with the double-color fluorescent powder colloid, 1-5 wt% of curing agent is added into the double-color fluorescent powder colloid, and the mass ratio of the double-color fluorescent powder to the fluorescent powder glue is 1:2-3. According to the white light LED, the UVLED chip is regarded as the matrix, the double-color fluorescent colloid is excited by ultraviolet light, the colloid is not easily decomposed by the ultraviolet light and ozone, a double bond is avoided, the fracture of chemical bonds of molecules at a high temperature (or radiation irradiation) is prevented, long-term usage is realized, crack and hardening are avoided, and the colloid can be automatically healed after crack by the external force.

Description

technical field [0001] The invention belongs to the technical field of white light LEDs, and in particular relates to an ultraviolet-excited white light LED containing two-color fluorescent powder and a preparation method thereof. Background technique [0002] GaN is a wide-bandgap compound semiconductor material, which has the characteristics of blue light emission, high temperature, high frequency, high voltage, high power, acid resistance, alkali resistance, and corrosion resistance. It is one of the most important semiconductor materials after germanium, silicon, and gallium arsenide. one. It occupies an important position in the field of blue light and ultraviolet optoelectronics technology, and is also an ideal material for making high-temperature and high-power semiconductor devices. [0003] At present, the main methods for obtaining white light from GaN-based LEDs are: blue LED + yellow phosphor powder, three-color LED synthetic white light, and purple LED + three-...

AI Technical Summary

Problems solved by technology

This commercial phosphor also has some disadvantages, mainly poor color saturation and color temperature instability

The poor color saturation is due to the lack of red light in white light, and the instability of color temperature is caused by the degradation of LED and phosphor performance due to long-term use