Light-emitting device with high red light brightness and high reliability

Abstract

The invention provides a light-emitting device. The light-emitting device comprises a heat conduction substrate, a reflecting layer and a light-emitting layer which are sequentially stacked from bottom to top. The light-emitting device is characterized in that the reflecting layer is a gold reflecting layer, the light-emitting layer comprises any one or more of Y3Al5O12: Ce 3+ fluorescent powder,(Y, Gd)3Al5O12: Ce 3+ fluorescent powder, alpha-SiAlON: Eu 2+ fluorescent powder and (Sr, Ca) AlSiN3: Eu 2+ fluorescent powder, the doping concentration of Ce 3+ in the Y3Al5O12: Ce 3+ fluorescent powder is 1.2mol% or above, the doping concentration of Ce 3+ in the (Y, Gd)3Al5O12: Ce 3+ fluorescent powder is 0.5mol% or above, and the doping concentration of Gd 3+ is 10mol% or above.

Description

technical field [0001] The invention relates to a light emitting device with high red brightness and high reliability. Background technique [0002] At present, it is a conventional technology in the field of laser light sources to irradiate phosphors with lasers to emit light of corresponding colors. We all know that when the laser light source is applied to white light lighting, increasing the red light ratio of the laser light source can improve the color rendering index of the lighting; when the laser light source is used in plant lighting, increasing the red light ratio of the laser light source can be beneficial to photosynthesis Effect and photoperiod effect, the reason is that red light is not only beneficial to the synthesis of plant carbohydrates, but also accelerates the development of long-day plants; and in laser display applications, increasing the proportion of red light in laser light sources can better achieve color reproduction , to solve the problem of re...

AI Technical Summary

Problems solved by technology

However, aluminum has low reflectivity and high heat generation, so the heat dissipation effect is not good enough

On the other hand, although the reflectivity of the silver reflective layer is relatively high, it is prone to oxidation and vulcanization, so the reliability is low.

In addition, there is also a method of using long-wavelength yellow light combined with a filter to generate red light, in which YAG:Ce with good thermal stability and good light saturation performance is used 3+ For the long-wavelength yellow light of the system, since the thermal effect of the yellow light source is smaller than that of the red light source, the brightness and efficiency of the red light produced by this method are better, but due to the use of filters, the cost is increased, The structure is not compact

It can be seen that the laser fluorescent light source that produces red light in the prior art is either high in cost and not compact in structure, or its red light efficiency and brightness are low, which restricts the improvement of the brightness and color gamut of its laser display products

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