White LED chip and forming method thereof

Abstract

The invention discloses a white LED and a forming method thereof. The white LED chip comprises a substrate, a first groove and a second groove, wherein the substrate is provided with a first buffer layer positioned on the substrate, a first active layer positioned on the first buffer layer and a first cap layer positioned on the first active layer; the first groove respectively penetrates through the first buffer layer and the first active layer and extends to the first cap layer; a second buffer layer, a second active layer and a second cap layer are arranged in the first groove; the second buffer layer is positioned on the substrate; the second active layer is positioned on the second buffer layer; the second cap layer is positioned on the second active layer; the second groove respectively penetrates through the first buffer layer and the first active layer and extends to the first cap layer; a third buffer layer, a third active layer and a third cap layer are arranged in the second groove; the third buffer layer is positioned on the substrate; the third active layer is positioned on the third buffer layer; and the third cap layer is positioned on the third active layer. By using the white LED, one LED chip can simultaneously emit red, green and blue light which are mixed to emit white light.

Description

technical field [0001] The invention relates to the field of semiconductor lighting, in particular to a white LED chip and a forming method thereof. Background technique [0002] Semiconductor light-emitting diode, or LED (Light Emitting Diode), is a semiconductor solid-state light-emitting device. It uses a solid semiconductor chip as a light-emitting material. In the semiconductor, the excess energy is released through the recombination of carriers to cause photon emission, and directly emits red, yellow, blue, green, blue, orange, purple and other colors of light. [0003] LEDs are divided into monochrome LEDs and white LEDs according to the color of the light emitted. Ultra-high-brightness LEDs appeared in the 1980s. The substrates of early red LEDs were opaque materials with a luminous efficiency of 1-2 lumens / watt (lumens / watt); they were improved later by using transparent substrates ; Among all ultra-high brightness red LEDs, the efficiency of the best model is abo...

AI Technical Summary

Problems solved by technology

[0006] (1) White light is synthesized by LED red, blue, and yellow three-primary-color multi-chip combination; disadvantages: different light decays of the three primary colors lead to unstable color temperature, complex control circuit, and high cost

[0007] (2) The blue LED chip excites the yellow phosphor powder, and the white light is synthesized by the blue light of the LED and the yellow-green light emitted by the phosphor powder. In order to change the color rendering performance, a small amount of red phosphor powder can be added to it or an appropriate amount of green and red phosphor powder can be added at the same time; Disadvantages: Poor consistency, color temperature, angle variation

Disadvantages: At present, the efficiency of LED chips is low, there are problems of ultraviolet light leakage, and the problem of temperature stability of phosphor powder needs to be solved

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