Homogenized white light source and homogenizing method

A technology of white light source and light source, which is applied to optical elements, lighting devices, and components of lighting devices for changing the spectral characteristics of emitted light, etc. Changes in properties, etc., to achieve the effect of controllable and stable color temperature and color rendering index, improving long-term stability, and reducing power density

Active Publication Date: 2017-06-13
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the small spot area and high energy density of the point light source, and the energy distribution of the point light source is mostly Gaussian distribution, the central energy is high, which easily leads to burns of the fluorescent conversion material, which seriously affects the long-term stability and reliability of the fluorescent conversion material. In addition, it is easy to cause changes in the properties of fluorescent materials, and it is difficult to control and stabilize the output white light in terms of color temperature and color rendering index.
Even due to the accumulation of heat at a single point, the fluorescent conversion material is directly broken and damaged, which affects the service life of the white light solid-state light source

Method used

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  • Homogenized white light source and homogenizing method
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  • Homogenized white light source and homogenizing method

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Embodiment 1

[0060] Such as figure 1 As shown, this embodiment proposes a homogenized white light source, including a light source 1, a homogenization system 2 and a fluorescent conversion device 3, wherein:

[0061] Light source 1 is a point light source for emitting light beams;

[0062] The homogenization system 2 is used to homogenize the beam so that the beam forms a homogenized surface light source;

[0063] The fluorescent conversion device 3 is used to receive and convert the light beam of the homogenized surface light source to form homogenized white light.

[0064] The above-mentioned light source 1 is a blue laser diode with a center wavelength of 450nm, which is output through optical fiber coupling.

[0065] The above-mentioned homogenization system 2 adopts a diffusion sheet with a surface structure as shown in FIG. 2 , so that the point light source of the blue laser diode irradiated on the diffusion sheet becomes a diffuse and homogenized surface light source. Figure 2(a...

Embodiment 2

[0069] Such as Figure 4 As shown, this embodiment proposes a homogenized white light source, including a plurality of light sources and a homogenization system, wherein:

[0070] Multiple light sources are point light sources for emitting beams of different wavelengths;

[0071] The homogenization system is used to homogenize beams of different wavelengths to form homogenized white light.

[0072] The above multiple light sources are respectively: a red laser 11 with a central wavelength of 650nm, a green laser 12 with a central wavelength of 532nm, and a blue laser 13 with a central wavelength of 450nm.

[0073] The above-mentioned homogenization system adopts a diffractive optical element 14 with surface phase information as shown in FIG. Use MATLA software to simulate the square homogenization and circular homogenization effects of the diffractive optical element 14, and obtain the simulation effect diagrams shown in Figure 6 (a) and Figure 6 (b), from Figure 6 (a) and F...

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Abstract

The invention provides a homogenized white light source comprising a light source, a homogenizing system, and a fluorescence conversion device, wherein the light source is a spot light source, and used for emitting light beams; the homogenizing system is used for homogenizing the light beams to enable the light beams to form homogenized surface light source; the fluorescence conversion device is used for receiving light beams from the homogenized surface light source to achieve white light output; the homogenizing system is a diffusion piece, diffraction optical element or micro lens array; the fluorescence conversion device is a crystal piece, sintered ceramics or organic film containing a fluorescence conversion material. In the invention, an original light source is changed into the surface light source with uniform energy distribution, the action area of a lighting element containing the fluorescence conversion material is enlarged, and the utilization rate of the original light source is increased; the homogenized surface light source can greatly reduce the power density born by the fluorescence conversion device containing the fluorescence conversion material, so that the long-term stabilization and the reliability of the fluorescence conversion device are improved, the service life of the fluorescence conversion device is prolonged, moreover, outputting white light with controllable and stable color temperature and color rendering indexes can be facilitated.

Description

technical field [0001] The invention belongs to the technical field of semiconductor and white light solid-state lighting applications, and more specifically relates to a homogenized white light source and a homogenization method thereof. Background technique [0002] Now the solid-state light source of white light is more mature based on light-emitting diode (Light Emitting Diode) solid-state light source. Light Emitting Diode (Light Emitting Diode) white light solid-state lighting is usually formed by two methods, the first is to use blue light emitting diode (Light Emitting Diode) and yellow phosphor to form white light; Emitting Diode) mixed to form a white light spectrum. [0003] In recent years, the preparation technology of blue laser diodes has gradually matured, and has become a research hotspot in the next-generation white solid-state lighting market after light-emitting diodes. The electro-optical conversion efficiency of white light solid-state lighting based ...

Claims

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Application Information

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IPC IPC(8): F21V5/00F21V9/16
CPCF21V5/00F21V9/30
Inventor 伊晓燕潘岭峰王晓峰何志王军喜李晋闽
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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