Wavelength-concentrated LED chip and LED wafer

Abstract

The invention discloses a wavelength-concentrated LED chip and an LED wafer. The chip comprises a light-emitting structure, a light splitting layer arranged on the light-emitting surface of the light-emitting structure, and a shielding layer. The light splitting layer divides light emitted by the light emitting structure into a light emitting group and a non-light emitting group, wherein the wavelength of light emitted by the light-emitting structure is a1-annm, the light-emitting group comprises light with the wavelength of ai-ajnm, the non-light-emitting group comprises light with the wavelength of a1-ainm and light with the wavelength of aj-annm, ai is larger than a1 and smaller than aj and smaller than an, and aj is larger than a1 and smaller than a; the shielding layer is made of a light shielding material and is arranged above the non-light-emitting group. According to the chip disclosed in the invention, through the cooperation of the light splitting layer and the shielding layer, light (light of a non-light-emitting group) with large chromatic aberration is filtered out, so that light (light of a light-emitting group) with a better wavelength range and concentrated wavelength is selected to be emitted, and the wavelength concentration and color purity of the LED chip are further improved.

Description

technical field [0001] The invention relates to the technical field of light emitting diodes, in particular to an LED chip and an LED wafer with concentrated wavelengths. Background technique [0002] LED display is a modern information release platform composed of LED dot matrix modules or pixel units, which has the advantages of high luminous efficiency, long service life, flexible configuration, rich colors, and strong adaptability to indoor and outdoor environments. [0003] Among them, ICE standard colorimetry stipulates that the standard wavelengths of the three primary colors of RGB are R (700nm), G (546.1nm), and B (435.8nm), where the wavelength determines the color. On the standard ICE chromaticity diagram, according to the difference in hue and saturation, various colors are distributed in regions, that is, if the points representing different chromaticity wavelengths are connected to the central white light point, the chromaticity diagram can be divided into mult...

AI Technical Summary

Problems solved by technology

[0005] The existing blue LED chips or green LED chips used in LED displays have high In content due to the influence of epitaxial materials, so the blue LED chips or green LED chips on the same wafer have a wider range of wavelengths. large, highly discrete

The higher the dispersion, the more obvious the chromatic aberration, which affects the yield of the chip and increases the cost

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