Preparation method of tellurate transparent fluorescent glass for LED (light emitting diode) illumination

Abstract

The invention discloses a preparation method of tellurate transparent fluorescent glass for LED (light emitting diode) illumination. The preparation method comprises the following steps: (1) sufficiently mixing frit with YAG fluorescent powder in a mortar, and grinding to obtain a fluorescent glass mixture, wherein the frit consists of TeO2, Na2CO3, H3BO3 and ZnO; (2) pouring the fluorescent glassmixture into a crucible, and sintering in a muffle furnace to obtain molten frit; (3) annealing the molten frit; (4) cooling to room temperature to obtain transparent fluorescent glass. The fluorescent glass prepared in the invention has the advantages of stable chemical performance, high transparency, good radiating effect and excellent optical performance, and is ground, polished and cut into acertain size and is encapsulated on an LED blue-light chip to emit white light.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a preparation method of tellurate transparent fluorescent glass for LED lighting. Background technique [0002] White LED is known as the fourth-generation lighting source. It has the advantages of high efficiency, good stability, long life, and small size. It is more and more widely used in the fields of indoor lighting, outdoor lighting and special lighting. At present, white LEDs are mainly realized by mixing and coating phosphor powder and epoxy resin or silica gel on blue LED chips in a certain proportion. The aging and yellowing of epoxy resin / silica gel will eventually lead to performance degradation of LED devices, such as loss of light efficiency, color temperature drift, and shortened lifespan. The refractive index of YAG phosphor particles is high (n=1.84), and the refractive index of epoxy resin / silica gel is low (n≈1.5). Their mixing togethe...

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Problems solved by technology

[0003] At present, the main method of preparing fluorescent glass is the melting and quenching method, which is similar to the traditional glass high-temperature melting method. The temperature during the preparation process is as high as 1500-1600 ° C and requires a long period of melting and heat treatment. The phosphor powder is easy to decompose during the glass melting process. , resulting in a significant reduction in fluorescence conversion efficiency. In recent years, researchers have begun to use low-melting point glass and phosphor powder to mix and sinter fluorescent glass to greatly reduce the sintering temperature and improve the conversion efficiency of phosphor powder.

[0004] Although the literature and patents on the method of preparing low-melting point YAG:Ce fluorescent glass have been publicly reported, there are generally two main problems in summary: first, the preparation process of the glass is relatively complicated, and requires two steps of melting-cooling process to complete. The process consumes a lot of energy; second, the design of the material composition is unreasonable, the refractive index difference between the phosphor particles and the matrix glass is too large, and the prepared fluorescent glass has low transparency and poor optical performance

The material has poor transparency and poor luminous performance, and the melting temperature required for silicate matrix glass is relatively high, and the preparation process is more complicated.

[0006] The Chinese invention patent CN 106630604A, "a low melting point tellurate glass ceramic, its preparation method and its application" applied by Shanghai University of Technology discloses a preparation method of a glass ceramic doped with YAG:Ce yellow phosphor powder, the glass Raw material composition is TeO 2 -Na 2 O-ZnO, the glass ceramics prepared by this method have low transparency, low light conversion efficiency, and low light efficiency

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