A preparation method of fluorescent film with "hamburger" structure for white light LED

Abstract

The invention discloses a preparing method of a hamburger-structure fluorescent film for a white light LED. The method includes the following steps that multiple groups of fluorescent powder and adhesive are weighed to serve as combined raw materials, each combined raw material group is placed into an adhesive preparing beaker and stirred to be mixed uniformly, and multiple fluorescent adhesive mixture groups are formed; the fluorescent adhesive mixtures mixed uniformly are vacuumized for defoamation; a spin coater is adopted to coat the multiple fluorescent adhesive mixture groups on a carrier on a substrate in a spinning mode to form multiple fluorescent film layers, after each fluorescent film layer is coated in the spinning mode, the fluorescent film layer and the substrate are placedinto a drying oven to be cured so that the fluorescent film layer can reach the micro curing state, after being coated in the spinning mode, the multiple fluorescent film layers are placed into the drying oven to be cured completely, and then the hamburger-structure fluorescent film for the white light LED is obtained. The preparing method is simple in preparing process and reduces the productioncost of a factory, the fluorescent powder of the prepared fluorescent film is distributed uniformly, and the fluorescent film is good in optical property.

Description

technical field [0001] The invention belongs to the field of LED encapsulation, and in particular relates to a preparation method of a "hamburger" structured fluorescent film for white light LEDs. Background technique [0002] With its advantages of energy saving, high efficiency, environmental protection, pollution-free, and long life, white LED has attracted extensive attention from experts and scholars in the field. As a new type of high-efficiency solid-state light source, it is another great leap in the history of human lighting after incandescent lamps and fluorescent lamps. It is considered It is the fourth-generation lighting source with broad application prospects. [0003] At present, the realization method of industrialized white light LED is usually to adopt LED blue light chip and coat the mixture of phosphor powder and silica gel on the surface of the blue light chip. The specific implementation process is as follows: fix the blue light chip on the bracket, mi...

AI Technical Summary

Problems solved by technology

[0006] Third, the fluorescent powder of the dispensing method is dispersed in silica gel or epoxy resin and surrounds the LED chip. The fluorescent powder will backscatter a part of the blue light, resulting in a decrease in the blue light luminous efficiency.

For example, "a remote phosphor light distribution film and its preparation method" disclosed in Chinese patent document CN103943761A, the phosphor light distribution film prepared by it is composed of three layers, and requires curing resin, dispersant, diluent, photocurable resin, etc. , the required materials are more, after the direct coating is completed, the coating layer needs to be cured under ultraviolet light, and finally a layer of EVA layer is applied on the coating layer; even if the raw materials are mixed evenly in the direct coating method, it is still unavoidable The most important thing is to ensure that the phosphor powder of each layer is evenly distributed during the coating process of each layer

For example, in the "method for preparing LED broadband gradient fluorescent film by chemical solution coating" disclosed in Chinese patent document CN104357909A, a sol-gel method and organic compound decomposition are used to prepare a fluorescent film. The process of this method is relatively complicated and requires many chemical materials and processes. Steps, and the preparation process needs to prepare a lot of solutions, prepare materials, etc., the chemical reaction is relatively difficult to control

In the above two preparation methods, a lot of organic chemical substances are used, which will inevitably have some impact on the optical properties of the fluorescent film.

Images