White light LED packaging method

Abstract

This invention relates to LED field, which discloses a white light LED and its packaging method. The white light LED includes chip, frame, silicon glue, fluorescence power film and periphery parts (such as lens). Difference between the packaging structures is that the space between the fluorescence power and chip is isolated by some materials such as silicon glue, which makes the heat of the fluorescence power and chip isolate; and the fluorescence power film brim contacts with the substrate, which makes the fluorescence power's heat conduct to the exterior to avoid the gather of fluorescence power heat. The chip is fixed on the frame, the silicon glue covers on the chip directly, the designed and prepared fluorescence power film cover on the silicon glue, and the fluorescence power film contact with the cup bowl. This method improves the light producing efficiency, and improves the stability of the light color greatly, and lowers the light decline. And the packaging method is simple, which is fit for industrial production in large scale.

Description

technical field [0001] The invention relates to a packaging method of a white light LED. Background technique [0002] LED is a semiconductor light-emitting device, which is widely used as indicator light, display screen and so on. White LED is known as the fourth-generation lighting source to replace fluorescent lamps and incandescent lamps. A traditional way to form a white light LED is that a blue light or ultraviolet chip excites the phosphor powder covered on the chip, and the light emitted by the chip under electric drive stimulates the phosphor powder to produce visible light in other bands, and each part mixes colors to form white light. [0003] The LED chips that generate white light by phosphor excitation are made of III-V compound semiconductor GaN materials. Among them, the substrate material used for GaN chip is Al 2 o 3 And SiC, the chip can emit blue light, ultraviolet light or other short-wavelength light. [0004] The phosphors used to form white LEDs ...

AI Technical Summary

Problems solved by technology

This method of remote excitation of phosphor powder improves part of the light extraction efficiency, but some of the structures proposed by them are more complicated, and the realization process is more difficult, and the heat emitted by the phosphor layer cannot be effectively conducted to the outside, resulting in large light decay. At the same time, the consistency of LED light color after packaging is difficult to control

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