Warm white light-emitting diode (LED) and manufacturing method thereof

Abstract

The invention discloses a warm white light-emitting diode (LED) and a manufacturing method thereof. The warm white light-emitting diode is characterized in that a red light wafer and a blue light wafer are combined together through a seaming layer by an LED structure, and the upper and lower surfaces of the seaming layer are respectively provided with a reflecting layer; the area of the lower surface of the red light wafer is less than or equal to one third of the area of the upper surface of the blue light wafer, thereby effectively reducing the volume of a packaging structure; and routing times are reduced, a process flow is optimized, and the fabricating cost is saved.

Description

technical field [0001] The invention relates to a light-emitting diode and a preparation method thereof, more specifically a warm white light-emitting diode and a preparation method thereof. Background technique [0002] LED light-emitting diode is a solid-state semiconductor device that can directly convert electricity into light. White light LED has many advantages such as high luminous efficiency, power saving, no heat radiation, no heavy metals such as mercury, no pollution and waste disposal problems, etc., and is regarded as the rising star of "green lighting source". At present, there are mainly three ways to realize white light: the first way is that the blue LED light-emitting diode excites the yellow phosphor to produce white light; the second way is that the ultraviolet LED excites the RGB three-wavelength phosphor to produce white light; the third way is RGB The three-color LED light-emitting diodes are mixed to form white light. The first two methods rely on l...

AI Technical Summary

Problems solved by technology

However, the following problems exist in the packaging process: the brightness emitted by the red chip is easily absorbed by the blue chip, and the brightness emitted by the blue chip is easily absorbed by the red chip. There is a certain distance, which has the problem of light mixing; in addition, the packaging structure needs to be large, which greatly increases the production cost; moreover, the red light chip and the blue light chip are individual chips, and the complicated wiring may cause abnormalities and high costs

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