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Phosphor glass coating for optical wavelength conversion and white light emitting device

A fluorescent glass and wavelength conversion technology, applied in semiconductor devices, electrical components, circuits, etc., can solve the problems of fluorescent wavelength drift, device operating temperature increase, affecting device light efficiency, etc., to avoid the deterioration of silica gel or resin. Yellow and reflective, good conversion efficiency, the effect of alleviating heat dissipation problems

Inactive Publication Date: 2013-02-27
JIANGSU MATERDIGE OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional LED packaging is to mix silica gel or resin with phosphor and then directly coat the surface of the blue light chip. However, this packaging method has its inherent disadvantages.
Part of the light emitted by the phosphor will re-enter the chip and be absorbed, resulting in loss of luminescence
The poor heat dissipation of the LED device will lead to an increase in the operating temperature of the device, causing the luminous wavelength of the phosphor to drift and the luminous intensity to decrease.
In addition, silica gel or resin will turn yellow after long-term exposure to blue light and high operating temperature when the device is working, which will affect the light efficiency of the device.

Method used

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  • Phosphor glass coating for optical wavelength conversion and white light emitting device
  • Phosphor glass coating for optical wavelength conversion and white light emitting device
  • Phosphor glass coating for optical wavelength conversion and white light emitting device

Examples

Experimental program
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Effect test

preparation example Construction

[0046] The preparation method of the present invention: (1) Mix the powder of glass B with the powder of phosphor C, organic solvent and binder at a mass ratio of 100:1-100:150 to form a uniform paste; liquid alcohol , ethers, ketones, esters, and hydrocarbons. Binders are solvent-soluble polymers (such as water-soluble polyvinyl alcohol, carboxycellulose), acrylic resins, styrene resins, butyral resins, ethyl cellulose, and the like.

[0047] (2) Apply the paste evenly on the glass substrate A, and dry the glass substrate A coated with the paste to completely evaporate the organic solvent;

[0048] (3) Sintering the dried glass substrate A coated with the paste, and obtaining a glass B coating layer containing phosphors on the surface of the glass substrate A.

[0049] In step (1), the mass ratio of the organic solvent to the binder is 10:1-1:1, and the organic solvent is one of phthalate and terpineol or a mixture of two of them in any proportion; The binder is one of acry...

Embodiment 1

[0053] The present invention will be described in detail below with reference to the accompanying drawings.

[0054] to attach figure 1 A method of manufacturing a phosphor-containing glass-coated glass substrate will now be described in detail.

[0055] As one of the specific examples, figure 1 The medium glass substrate A is ordinary soda lime glass, the surface is a part of a spherical surface, the thickness is 1 mm, and the glass transition temperature is 570 o C, softening temperature 620 o c.

[0056] As one of the specific examples, figure 1 Medium glass B is a low-melting phosphate glass, and its components include P 2 o 5 : 41%, ZnO: 34%, B 2 o 3 : 19%, (Li 2 O 3% + Na 2 O 1.5% + K 2 O 1.5%): 6%. Glass transition temperature 480 o C, the softening temperature is 526 o C;

[0057] Phosphor C is YAG yellow phosphor, and its particle size distribution is d 50 to 10 microns.

[0058] The particle size distribution of glass B powder is d 50 =15 micron...

Embodiment 2

[0067] The difference between this embodiment and embodiment 1 lies in the use of image 3 The double-layer phosphor-containing glass coating structure shown, wherein:

[0068] 1 is containing (Sr,Ca)S:Eu 2+ Glass coating of red phosphor, 2 is glass coating containing YAG yellow phosphor. The composition of Glass B for the two coats is the same as in Example 1. The particle size distribution of the two phosphor particles is d 50 =15 microns.

[0069] The two-layer glass coating containing the phosphor in this example is transparent after sintering, with a smooth surface and no warped edges.

[0070] Using a blue light chip grown on a 1W SiC substrate, the blue light emitted by the blue light chip irradiates the glass A substrate with the glass B coating containing phosphors, and a bright white light (84 lm / W) is obtained.

[0071] In this embodiment, the glass substrate A can also be cylindrical, as shown in the schematic diagram Figure 4 shown.

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Abstract

The invention discloses a method for manufacturing a phosphor glass coating for optical wavelength conversion, which comprises the step of sintering and preparing a mixed layer of the powder of a phosphor C and glass B on a glass substrate A, specifically: (1) mixing the powder of the glass B and the phosphor C at a mass ratio of (100:1)-(100:150), binder and solvent into uniform paste, wherein the particle size of the powder of the glass B and the phosphor is 1-6 microns; (2) uniformly coating the paste on the glass substrate A and drying the glass substrate A coated with the paste to make the solvent volatilize completely; and (3) sintering the dried glass substrate A coated with the paste to obtain a glass B coating with the phosphor on the surface of the glass substrate A, wherein the sintering temperature of the phosphor glass coating is higher than the conversion temperature of the glass B in step (3).

Description

technical field [0001] The invention relates to a method for manufacturing a fluorescent glass coating used for optical wavelength conversion and a white light LED lighting device. Background technique [0002] As a new type of lighting source, white light LED has many advantages such as energy saving, environmental protection and long life. Its working principle is to use the combination of blue light chip and yellow phosphor powder (or other combination methods) to obtain white light. Traditional LED packaging is to mix silica gel or resin with phosphor and then directly coat the surface of the blue light chip. However, this packaging method has its inherent disadvantages. Part of the light emitted by the phosphor will re-enter the chip and be absorbed, resulting in loss of luminescence. Poor heat dissipation of the LED device will lead to an increase in the operating temperature of the device, causing the luminous wavelength of the phosphor to drift and the luminous int...

Claims

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Application Information

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IPC IPC(8): H01L33/50H01L25/075
CPCH01L2224/48137H01L2224/48091H01L2924/00014
Inventor 钱志强金正武
Owner JIANGSU MATERDIGE OPTOELECTRONICS TECH CO LTD
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