Method for preparing white LED

Abstract

The invention provides a method for preparing a white LED. The method of preparing the white LED comprises the steps of fixing an LED chip on a substrate arranged in an array; attaching a fluorescent film on the surface of the LED chip; making a mold corresponding to the substrate, arranging a projection corresponding to the size and shape of the surface of LED chip and for covering the surface of the LED chip onto the mold, and filling the mold with white glue slightly lower than the height of the projection; buckling the substrate fixed with the LED chip onto the mold, flipping the mold, and removing the mold after the white glue is formed at the periphery of the LED chip, baked and cured; forming a transparent silicone lens on the surface of the white LED coated with the white glue at the periphery; and cutting the substrate to forming a single white LED. The method avoids the phenomenon of blue light leakage of the white LED by coating the periphery of the LED chip with the white glue through the mold, the operation method is simple, low in cost and high in working efficiency, and the white light emitted by the packaged white LED is uniform and saturated in color, with no yellow or blue spot.

Description

technical field [0001] The invention belongs to the technical field of semiconductors, and in particular relates to a preparation method of a white light LED. Background technique [0002] LED (Light Emitting Diode, light-emitting diode) is a solid-state semiconductor device that can convert electrical energy into visible light, and it can directly convert electrical energy into light energy. LED is widely used as a new lighting source material. As a new type of light source, white LEDs are rapidly developing due to their advantages such as fast response, good shock resistance, long life, energy saving and environmental protection. Has been widely used in landscaping and indoor and outdoor lighting and other fields. [0003] At present, there are low-power in-line, low-power SMD and high-power white LED packaging methods. Regardless of the method, the production of white light mainly adopts the process of coating yellow phosphor powder on the blue light chip. The specific...

AI Technical Summary

Problems solved by technology

However, in the above-mentioned packaging process, only a layer of fluorescent glue is coated on the surface of the chip, and the surrounding area of ​​the chip is not coated with fluorescent glue, so there will be blue light leakage around the chip, resulting in the blue light leakage of the packaged white LED device, making the color of white light not good. Uniform, often with yellow or blue spots

Images