Wavelength conversion device, and light source and projection device including the same
A wavelength conversion device and light-emitting layer technology, which is applied in light sources, lighting devices, semiconductor devices of light-emitting elements, etc., can solve problems such as the performance impact of the light-emitting layer of the wavelength conversion device, and achieve high average reflectance, high light conversion efficiency, and high efficiency. and reliability effects
Active Publication Date: 2019-01-29
APPOTRONICS CORP LTD
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Problems solved by technology
However, when a laser with a power density much higher than that of an LED is used for irradiation, a large amount of heat generated during laser irradiation will have a significant impact on the performance of the light-emitting layer of the wavelength conversion device
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[0042] Next, the composition and structure of an exemplary wavelength conversion device of the present invention will be described through the following preparation examples.
[0043] The inventors found in research that, for the wavelength conversion device, the particle size of the phosphor material in the light-emitting layer affects the light-emitting efficiency and yield (reliability). When the particle size of the phosphor material is in a specific range (5-20 μm), compared with the phosphor material with a smaller particle size (20μm), not only better yield rate, but also better luminous efficiency is achieved, where the yield rate refers to the Among the prepared wavelength conversion device samples, the ratio of samples whose reliability meets the requirements to the total amount of samples.
[0044] In addition, the inventors also found that for the wavelength conversion device, the particle size of the reflective particles in the reflective layer will further affect...
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Abstract
The invention relates to a wavelength conversion device, and a light source and a projection device including the same. The wavelength conversion device includes a light emitting layer, a reflecting layer, and a substrate which are sequentially stacked, and is characterized in that the light emitting layer includes first glass powder and phosphor powder materials, wherein the phosphor powder materials are encapsulated into layers by the first glass powder, and the particle size D50 of the phosphor powder materials is 5-20 [mu]m. By controlling the phosphor powder materials, preferably controlling the particle size of reflection particles and an encapsulant, the accumulation filling rate of phosphor powder particles in the light emitting layer and the reflection particles in the reflectinglayer is higher while the wavelength conversion device ensures the high adhesion yield, and so, the light emitting layer is provided with higher light conversion efficiency and the reflecting layer isprovided with higher average reflectivity, so that the wavelength conversion device can still maintain high efficiency and reliability at high excitation light power density.
Description
technical field [0001] The invention relates to a wavelength conversion device, a light source and a projection device including the wavelength conversion device. Background technique [0002] At present, the main application forms of semiconductor light sources are traditional LED light sources and emerging laser light sources. In the display field with high brightness requirements, traditional LED light source technology has been unable to meet the needs of high brightness and high power. Visible light of various colors can be obtained by using an emerging laser light source to excite wavelength conversion materials. This technology has been more and more used in the field of lighting and display. This technology has high efficiency, low energy consumption, low cost and long life. It is an ideal replacement for existing white light or monochromatic light. [0003] In the laser light source, the technology that the laser remotely excites the rotating fluorescent color whee...
Claims
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IPC IPC(8): F21K9/64F21Y115/10
CPCF21K9/64F21Y2115/10
Inventor 李乾王艳刚许颜正
Owner APPOTRONICS CORP LTD