Light emitting device and light emitting system

Abstract

A light emitting device and system includes an LED for emitting the first light, an excitation light source for emitting excitation light, and a wavelength conversion layer applied on the light emitting face of the LED. The wavelength conversion layer can not be excited by the first light, and can be excited by the excitation light to emit the second light. The light emitting device further includes a light path separating device arranged in the light path between the wavelength conversion layer and the excitation light source. The light path separating device is used for guiding the excitation light to the wavelength conversion layer, and in order to form the output light of the light emitting device, guiding the mixed light emitted by the wavelength conversion layer to be separated from the path of the excitation light, wherein the mixed light comprises the first and second light. Such light emitting device and system utilizes the light reflection effect of the LED itself, thereby realizing the mixture of the first light emitted by the LED and the second light generated by the wavelength conversion layer applied on the surface of the LED without enlarging the light emitting area of the light source.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a light emitting device and a light emitting system. Background technique [0002] At present, semiconductor lighting has been paid more and more attention by people, among which monochromatic light sources that can emit red, green, and blue light have broad application prospects in projection display and stage decoration lighting. [0003] At present, there are mainly two technical routes for realizing monochromatic light sources. The first is to use monochromatic light emitting diodes (LEDs, light emitting diodes) to directly generate each monochromatic light, and the second is to use blue light or ultraviolet light emitting diodes to excite each light emitting diode. Monochromatic phosphors are used to produce monochromatic light. These two methods have their own advantages. The monochromatic light produced by the LED has a small spectral width, so the color is bright and br...

AI Technical Summary

Problems solved by technology

However, from Figure 7 It can be seen that due to the close color, there is a large overlap between the luminescence spectra of monochromatic LEDs and phosphors of the same color, so it is impossible to use commonly used light-combining devices such as interference filters to combine the two lights into one beam by using the difference in wavelength of the two lights.

Therefore, if two kinds of light are to be used together, the two light sources must be placed side by side, which will inevitably increase the light-emitting area of ​​the light source and the cross-sectional diameter of the beam, thereby significantly reducing the energy density of the beam, which is difficult for projection display and projection lighting. accepted

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