White LED chip and forming method thereof

Abstract

The invention relates to a white light-emitting diode (LED) chip and a forming method thereof. The white LED chip comprises a silicon substrate, a first buffer layer, a first active layer, a first cap layer, a first groove and a second groove, wherein the first buffer layer, the first active layer and the first cap layer are positioned on the silicon substrate sequentially; the first groove passes through the first buffer layer and the first active layer respectively to extend to the first cap layer, and a second buffer layer, a second active layer and a second cap layer are arranged in the first groove; the second groove passes through the first buffer layer and the first active layer respectively to extend to the first cap layer, and a third buffer layer, a third active layer and a third cap layer are arranged in the second groove; and the first active layer, the second active layer and the third active layer are selected from one of a blue light active layer, a green light active layer and a red light active layer respectively and are the active layers with different colors. When used, the white LED chip can emit red light, green light and blue light simultaneously, and can emit white light after the light with three colors is mixed; and due to the adoption of the silicon substrate which deviates 1 to 9 degrees from a crystal plane (111) in the crystal orientation, dislocation between the buffer layers and the silicon substrate can be reduced.

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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