Wavelength conversion device and preparation method thereof, light-emitting device and projection device

Abstract

The invention provides a wavelength conversion device and a preparation method thereof, a light-emitting device and a projection device. The wavelength conversion device comprises a luminescent ceramic and scattering particles, wherein the scattering particles are uniformly dispersed in the luminescent ceramic and have particle sizes of 10 to 500 nm; the volume fraction of the scattering particlesin the wavelength conversion device is 1 to 60%; and the luminescent ceramic is an oxide ceramic of a garnet structure, and is doped by 0.01 to 1% of doping ions. The wavelength conversion device hasthe beneficial effects of high thermal stability and light saturation resistance.

Description

technical field [0001] The invention relates to the technical field of illumination and projection, in particular to a wavelength conversion device and a preparation method thereof, a light emitting device and a projection device. Background technique [0002] With the development of display and lighting technology, the original halogen bulb as a light source is increasingly unable to meet the high power and high brightness requirements of display and lighting. Visible light of various colors can be obtained by using excitation light emitted by a solid-state light source such as an LD (Laser Diode, laser diode) to excite wavelength conversion materials, and this technology is increasingly used in lighting and display. This technology has the advantages of high efficiency, low energy consumption, low cost, and long life, and is an ideal alternative to existing white or monochromatic light sources. [0003] At present, the packaging methods of phosphor powder are mainly organ...

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Problems solved by technology

For example, at present, there are two main ways of packaging YAG luminescent ceramics, one is YAG phosphor and thermal conductive powder Al 2 o 3 Mix and sinter to form a composite luminescent ceramic, and adjust the degree of scattering through alumina to improve the absorption probability of the luminescent ceramic to the excitation light, but the Ce in the YAG phosphor 3+ The doping concentration is high, the thermal stability is poor, and the phenomenon of luminescence saturation is easy to occur under the excitation of high-power blue light; the other is to use aluminum oxide, yttrium oxide, and cerium oxide raw materials (doping concentration above 3%) for mixed sintering A pure-phase luminescent ceramic is formed, and the thermal stability of the luminescent ceramic prepared in this way is improved, but there are still Ce 3+ If the doping concentration is too high, the thermal stability cannot meet the application of high-power excitation light; at the same time, this method can also control the degree of scattering through the pore-forming agent, but the thermal conductivity of the luminescent ceramic with a porous structure is low, and it is difficult to make a thin film When the structural strength is poor

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