Fluorescent powder lamella, fluorescent powder color wheel, and light source using fluorescent powder lamella

A fluorescent pink wheel and fluorescent powder technology, applied to light sources, optical elements for changing the spectral characteristics of emitted light, components of lighting devices, etc., can solve the problem of reducing luminous efficiency, high laser power density, and failure to reach the optimal value and other issues to achieve high efficiency

Active Publication Date: 2012-10-03
APPOTRONICS CORP LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problem with this solution is that due to the extremely high power density of the laser, when the phosphor is excited, the phosphor itself will have a saturation effect and a thermal quenching effect, which seriously reduces the luminous efficiency.
This is mainly because the particle size of the current commercialized phosphors is customized according to the LED light source, and the optical power density of the LED is more than an order of magnitude lower than the power density of the laser, so it is not optimized for laser applications. value

Method used

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  • Fluorescent powder lamella, fluorescent powder color wheel, and light source using fluorescent powder lamella
  • Fluorescent powder lamella, fluorescent powder color wheel, and light source using fluorescent powder lamella
  • Fluorescent powder lamella, fluorescent powder color wheel, and light source using fluorescent powder lamella

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Experimental program
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Embodiment Construction

[0023] For convenience, um is used in the following description to represent the length unit micrometer.

[0024] figure 2 Shown is the normalized luminance curves of phosphor powders with different particle sizes illuminated by excitation light sources with different optical power densities when the phosphor pink wheel of the present invention moves periodically. Excitation light sources include lasers and LEDs, etc. This experiment uses lasers as an example, but it is not limited to this in practical applications.

[0025] Such as figure 2 It can be seen that the brightness and efficiency of phosphors with the same particle size decrease with the increase of the driving current of the excitation light source, especially when the optical power density of the excitation light source increases to a certain threshold, the brightness of the fluorescent light shows an avalanche type of decline. The aforementioned optical power density refers to the maximum optical power densi...

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Abstract

The invention provides a fluorescent powder lamella, a fluorescent powder color wheel, and a light source using the fluorescent powder lamella. The fluorescent powder color wheel comprises a substrate and the fluorescent powder lamella, wherein the fluorescent powder lamella comprises a lamella which is formed by bonding fluorescent powder particles with an organic or inorganic binder; the granularity of the fluorescent powder D50 is greater than or equal to 20 mu m; the fluorescent powder lamella covers at least one part of the one side surface or forms at least one part of the substrate, and can be excited and converted into excited light of at least one color. Compared with the prior art, the fluorescent powder lamella, the fluorescent powder color wheel, and the light source using the fluorescent powder lamella provided by the invention adopt the fluorescent powder of which the granularity D50 is greater than or equal to 20 mu m; and high efficiency of the fluorescent powder lamella can still be maintained in high exciting light power density.

Description

technical field [0001] The invention relates to the technical field of light sources for illumination and display, in particular to a fluorescent powder sheet, a fluorescent pink wheel and a light source using the fluorescent powder sheet. Background technique [0002] At present, phosphor powder is one of the core raw materials of semiconductor lighting, and is widely used in LED (Light Emitting Diode) light source and laser light source. In LED white light sources, phosphors play a pivotal role. [0003] figure 1 Shown is the paper published in the Journal of Applied Physics, Japan (Journal of Applied Physics, Japan) in 2005, Vol. 44, No. 21, pp. 649-651, "The use of micro-fluorescence structures and scattering radiation cups in white light-emitting diodes can significantly improve the fluorescence Various LED phosphor packaging methods and structures proposed in the article "Strongly Enhanced Phosphor Efficiency in GaInN White Light-Emitting Diodes Using Remote Phosphor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/50F21K99/00F21V9/40
Inventor 杨毅
Owner APPOTRONICS CORP LTD
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