Preparation method of LED remote excitation fluorescent powder layer

Abstract

The invention discloses a preparation method of an LED remote excitation fluorescent powder layer. The preparation method is characterized by comprising the following steps that (1), aluminum oxide suspension is prepared; (2), a bonding agent is prepared; (3), a surfactant is prepared; (4), fluorescent powder slurry is prepared, specifically, a certain mass of fluorescent powder is weighed according to the needed luminescent characteristics, the three solutions prepared in the step (1), the step (2) and the step (3) are added, full and uniform stirring is conducted, and the needed fluorescentpowder slurry is obtained; (5), the fluorescent powder slurry is applied and dried, specifically, the fluorescent powder slurry is applied to the inner wall of a lampshade through a selected applyingmethod and then dried, and a fluorescent powder colloid layer with the uniformly-dispersed fluorescent powder is obtained; and (6), the temporary bonding agent is removed, specifically, the organic temporary bonding agent in the fluorescent powder colloid layer is removed as needed, and the final needed fluorescent powder layer is obtained. According to the preparation method, the process is simple, the operability is high, the production efficiency can be improved to a great extent, and the product property can be improved.

Description

technical field [0001] The present invention relates to the field of optoelectronic technology, in particular to a technique for preparing a phosphor layer in a direction far away from the surface of an LED chip, a white light LED light color mixing technique for phosphor conversion, a light extraction technique for improving light extraction efficiency, and an improvement in the space color of white light. White light technology with uniformity. Background technique [0002] LED is the abbreviation of light emitting diode. In 1993, a breakthrough was made in blue LED technology using GaN as the light-emitting material, and on this basis, LED white light emission was realized in 1996. Because LED has the advantages of low-voltage drive, full solid-state, high luminous efficiency, low power consumption, and high reliability, the application research of white LED devices in lighting-related fields has also been highly valued by academia and industry. It is an environmentally ...

AI Technical Summary

Problems solved by technology

The main problems of the white light obtained in this way are: the mixed white light has uneven spatial chromaticity, macular and blue spots; The effect of heat on the surface of the chip makes the phosphor decay faster, resulting in the bluer the white light color will be as the usage time is longer.

These methods have certain limitations and disadvantages. For example, when spraying, self-sedimentation, and screen printing methods are used, they can only be carried out on a flat surface, but cannot be carried out on a curved or spherical surface. It is necessary to add a transparent cover or milky white protective cover outside the shell, which will reduce the light extraction efficiency. In addition, the service life of the organic resin will also affect the reliability and long-term stability of the lamp product

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