Method for generating white light

Abstract

The invention relates to a green lighting technology, and discloses a method for generating white light. The method comprises the steps that an ultraviolet light source is adopted, excites at least two ZnO-based quantum dots, and radiates at least one light with the peak wavelength within 470-500 nanometers, and at least one light with the peak wavelength within 550-760 nanometers, and the radiant light is mixed to generate the white light. The white light generated by the method is continuous wide-spectrum white light with a higher display index; a color temperature width range of the white light can be adjusted; the phenomenon of light color distortion is avoided; a light color of the white light is stable; color coordinates and a color gamut are easy to adjust and control; the color coordinates of the generated white light fall in a crescent-shaped white light color interval surrounding a black body locus; the interval includes nearly all white light colors; and ultraviolet light is consumed completely, and converted into long wavelength light with the wavelength greater than 470 nanometers, so that harms of blue light can be reduced.

Description

technical field [0001] The present invention relates to the technical field of lighting, in particular to a green lighting technology, and more particularly to a method for generating white light. Background technique [0002] At present, in the field of LED green lighting, the most important way to obtain white light is to use blue LED chips to excite yellow phosphors. [0003] Although such illuminating white light has a high luminous efficiency, because it is a discontinuous spectrum, there is an obvious spectrum missing phenomenon in some visible light bands: yellow phosphors generally have red spectrum missing. [0004] Moreover, the blue light spectrum of the blue LED chip is narrow, resulting in a low display index of the obtained white light, generally below 80, which cannot meet the requirements of high color rendering lighting occasions. [0005] In addition, since the white light synthesized in this way is composed of the yellow fluorescence of the phosphor and t...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems of low white light color rendering index, poor white light stability, and light color distortion in the above-mentioned "blue light LED combined with yellow phosphor powder to generate white light" technology, people try to use ultraviolet-near ultraviolet LEDs to excite red, green and blue three primary color phosphors with different outputs. Radiant light, these different radiant lights naturally mix to produce white light

[0009] But its disadvantages are: the absorption / excitation / emission spectra, thermal stability, chemical stability, aging decay rate, etc. of different powders in the mixed phosphor are inconsistent, resulting in difficulty in adjusting the ratio, color coordinates and color gamut; and different There is reabsorption of light color between phosphor powders, which makes the fluorescence efficiency low

At present, CdSe (cadmium selenide) quantum dots that can emit white light fluorescence are more researched, but because they are harmful to the human body, and cadmium is a heavy metal element, there is an environmental pollution hazard, so it cannot meet the environmental protection and safety requirements of green lighting.

[0013] To sum up, the existing technology for generating white light has certain limitations, and there are related problems and defects that are difficult to solve, and the technology needs to be innovated and improved.

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