Single-chip white-light LED and preparation method thereof

Abstract

The invention provides a single-chip white-light light-emitting diode (LED) and a preparation method thereof. The single-chip white-light LED comprises a red-light LED chip, a blue-light LED chip and a green-light LED chip. The preparation method comprises the following steps of: (1) preparing a blue-light LED chip structure; (2) preparing a red-light LED chip structure; (3) preparing a green-light LED chip structure; (4) oppositely gluing a red-light LED epitaxial layer and a blue-light LED epitaxial layer together; (5) removing a blue-light LED chip substrate; (6) gluing a green-light LED epitaxial layer and the blue-light LED epitaxial layer together in a mode that the bottoms of the green-light LED epitaxial layer and the blue-light LED epitaxial layer are opposite; (7) removing a GaAs substrate of the red-light LED chip; (8) preparing a P electrode on the red-light LED epitaxial layer; and (9) preparing an N electrode on the bottom of the substrate of the green-light LED chip to obtain the single-chip white-light LED with a vertical structure. The single-chip white-light LED can emit white light by a single chip, and has the advantages of long service life, high stability, small volume, high luminous efficiency and the like.

Description

technical field [0001] The invention relates to a semiconductor light-emitting diode (LED) structure and a manufacturing method thereof, belonging to the technical field of light-emitting diode (LED) manufacturing. Background technique [0002] At present, there are three main methods for LED to achieve white light: 1. Combining red, green and blue LEDs with three primary colors and multi-chips to emit light and synthesize white light; its advantages are high efficiency, controllable color temperature, and good color rendering, but the disadvantage is that the three primary colors light decay The color temperature is unstable due to the difference, the packaging and bonding are more complicated, and the red, green, and blue primary color chips require different driving voltages, and different driving currents need to be added to each LED chip to adjust the color and brightness, and the control circuit is more complicated. , high cost; 2. Blue LED chip excites yellow phosphor...

AI Technical Summary

Problems solved by technology

[0002] At present, there are three main methods for LED to achieve white light: 1. Combining red, green and blue LEDs with three primary colors and multi-chips to emit light and synthesize white light; its advantages are high efficiency, controllable color temperature, and good color rendering, but the disadvantage is that the three primary colors light decay The color temperature is unstable due to the difference, the packaging and bonding are more complicated, and the red, green, and blue primary color chips require different driving voltages, and different driving currents need to be added to each LED chip to adjust the color and brightness, and the control circuit is more complicated. , high cost; 2. Blue LED chip excites yellow phosphor powder, and white light is synthesized from blue light of LED and yellow-green light emitted by phosphor powder; in order to improve color rendering performance, a small amount of red phosphor powder can be added or appropriate amount of green and red phosphor can be added at the same time Its advantages are high efficiency, simple preparation, good temperature stability, and good color rendering; its disadvantages are poor consistency, color temperature changes with angles, and accurate quantitative control of yellow phosphors is not easy, resulting in bluish or bluish light color. Yellowish phenomenon; 3. The ultraviolet light LED chip excites the phosphor powder to emit three primary colors to synthesize white light; its advantages are good color rendering and simple preparation; its disadvantage is that the efficiency of the current LED chip is low, there is a problem of ultraviolet light leakage, and the temperature of the phosphor powder exists Instability and other issues

[0004] The above-mentioned "A White Light LED Chip and Its Manufacturing Method" uses three types of chips to be stacked, which is equivalent to connecting three types of chips in series. Each of the three types of chips has its own upper and lower electrodes and substrates, which are three independent chips; The light of the three colors is gradually collected in the epoxy resin lens and finally mixed into white light. Using the epoxy resin lens to concentrate and mix the light is similar to encapsulating the chips of the three colors in the same epoxy resin, and the packaging process is relatively cumbersome and complicated.

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