Wavelength conversion apparatus and light emitting device

Abstract

The invention brings forward a wavelength conversion apparatus for absorbing exciting light and emitting excited light. The wavelength conversion apparatus comprises a wavelength conversion layer and a heat-conduction substrate. To be specific, the wavelength conversion layer includes wavelength conversion particles and first heat-conduction particles, wherein the wavelength conversion particles and the first heat-conduction particles are mixed uniformly. The heat conductivity coefficient of the first heat-conduction particle is higher than 10W / m.K; and the size D2 of the first heat-conduction particle is less than or equal to 0.5 times of the size D1 of the wavelength conversion particle and is larger than or equal to 0.05 times of the D1. The wavelength conversion layer is tightly attached to the surface of the heat-conduction substrate. According to the invention, gaps among the wavelength conversion particles are filled with the first heat-conduction particles with the specific particle sizes, thereby effectively improving the thermal conductivity of the wavelength conversion layer. Therefore, heat emitted by the wavelength conversion particles can be effectively conducted to the surface of the wavelength conversion layer and then is dissipated through the heat-conduction substrate, so that the temperature of the wavelength conversion layer is effectively reduced.

Description

[0001] technical field [0002] The invention relates to the field of light emitting technology, in particular to a wavelength conversion device and a light emitting device. [0003] Background technique [0004] At present, in the field of luminescent technology, using excitation light to excite phosphor materials has become a commonly used technology. However, as the requirements for luminous power are getting higher and higher, and the power of excitation light is getting stronger and stronger, the problem of heat dissipation of phosphors has increasingly become a bottleneck restricting this luminous technology. [0005] In the traditional method, the fluorescent powder is mixed with transparent colloids such as silica gel or epoxy resin, and cured after molding to form a wavelength conversion body or a wavelength conversion layer. In this way, the heat emitted by the phosphor is mainly absorbed by the colloids around it, and these colloids have poor thermal conductivit...

AI Technical Summary

Problems solved by technology

When the excitation light power is high, the temperature in the wavelength conversion body or layer is very high, which not only causes a decrease in phosphor efficiency, but also causes rapid aging and yellowing of the colloid, which affects the performance and life of the entire light-emitting device.

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