A kind of fluorescent ceramics and sapphire composite ceramic material and preparation method thereof

Abstract

The invention discloses a fluorescent ceramic and sapphire compound ceramic material and a preparation method thereof. The compound ceramic material comprises a fluorescent ceramic layer, a sapphire layer and a connecting layer, wherein the connecting layer is composed of non-continuous fluorescent particles obtained by dispersing glass and have components the same as that of the fluorescent ceramic layer. The connecting layer is used for connecting the fluorescent ceramic layer and the sapphire layer, and the layers are sintered at high temperature to obtain the compound ceramic material; theresponse wavelength of the fluorescent ceramic layer is 445 to 465nm; the connecting layer has a scattering effect on an excitation light source; the sapphire layer has high heat conductivity and hasa heat dissipation effect. According to the fluorescent ceramic and sapphire compound ceramic material, sapphire and fluorescent ceramic are used for constructing a compound structure, so that the heat conduction of the fluorescent ceramic is enhanced and a laser damage threshold value of the ceramic is improved; fluorescent powder has the effect of connecting the fluorescent ceramic and the sapphire, has a fluorescent property and is used for enhancing the luminescence; meanwhile, the scattering of the excitation light source is enhanced. The fluorescent ceramic and sapphire compound ceramicmaterial and the preparation method thereof have the advantages that a preparation technology is simple and the fluorescent ceramic and sapphire compound ceramic material is especially suitable for large-power and high-power-density laser illumination and display devices and other compact type devices.

Description

technical field [0001] The invention relates to laser lighting and display technology, in particular to a composite ceramic material integrated with light conversion and heat dissipation for high power density laser lighting and display devices and a preparation method thereof. Background technique [0002] With the rapid development of display technology, mercury lamps and halogen lamps as light sources cannot meet the needs of high-quality, high-power and high-brightness displays due to defects such as high energy consumption, short life, large volume, and high heat. Based on the laser LD (LaserDiode) as the excitation light source, the lighting and display technology of the light source module with the fluorescent material as the light conversion carrier has been more and more advanced due to its high brightness, high light efficiency, miniaturization, wider color gamut and longer service life. Much attention. [0003] In order to meet the needs of high-power excitation ...

AI Technical Summary

Problems solved by technology

However, the surface energy of sapphire is low, and the density of sapphire and fluorescent ceramics is very high, so it cannot be connected by diffusion sintering at a temperature lower than the sintering temperature of fluorescent ceramics; and the commonly used bonding materials have low thermal conductivity. efficiency and thermal stability, or low light transmittance, fluorescence excitation light and emission light, so it cannot meet the needs of high-efficiency, high-power-density laser light sources; and the mechanical connection method is not only not suitable for micro-devices, but also There is inevitably air in the middle of composite ceramics obtained by mechanical connection, which has a serious negative impact on the heat transfer of ceramics