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Luminous glass ceramic used for LED white-light illumination and preparation method thereof

A technology of luminescent glass and ceramics, which is applied in the direction of optical elements, lighting and heating equipment, and components of lighting devices used to change the spectral characteristics of emitted light. Problems such as poor temperature stability, to achieve the effect of improving luminous intensity

Inactive Publication Date: 2010-06-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, more mature white LEDs are realized by using blue LEDs with yellow phosphors, but phosphors have problems such as obvious light attenuation, poor resistance to ultraviolet radiation, and poor temperature stability.

Method used

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  • Luminous glass ceramic used for LED white-light illumination and preparation method thereof
  • Luminous glass ceramic used for LED white-light illumination and preparation method thereof
  • Luminous glass ceramic used for LED white-light illumination and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] By composition 50SiO 2 -20Al 2 o 3 -10ZnF 2 -20CeF 3 -2DyF 3 -2EuF 3 Weigh SiO 2 , Al 2 o 3 , ZnF 2 , CeF 3 , DyF 3 and EuF 3 , and mix the above raw materials well, put them into a graphite-corundum double-layer crucible, and put them into a melting furnace that has been heated to 1350 ° C. After the melting material is kept at 1350 ° C for 30 minutes, it is quickly taken out from the melting furnace Crucible, the melt in the crucible is quickly poured into a copper mold to obtain a glass sample. According to the DTA curve of the glass, the glass was heat-treated at 630° C. between the first crystallization peak temperature and the glass transition temperature for 2 hours to obtain glass ceramics. XRD analysis shows that CeF is distributed in the glass ceramics 3 nanocrystalline phase.

[0031] The glass-ceramics that this example makes is under 615nm monitoring, 576nm monitoring and 440nm monitoring the excitation spectrum, as respectively figure 1 , ...

Embodiment 2

[0033] According to the composition of 51SiO 2 -20Al 2 o 3 -15Na 2 O-12CeF 3 -1DyF 3 -1EuF 3 Weigh SiO 2 , Al 2 o 3 , Na 2 CO 3 , CeF 3 , DyF 3 and EuF 3, and the above raw materials are fully mixed, placed in a graphite-corundum double-layer crucible, and put into a melting furnace that has been heated to 1500 ° C to melt the raw materials into a liquid state. After the melting material is kept at 1500 ° C for 45 minutes, The crucible is quickly taken out of the furnace, and the molten material in the crucible is quickly poured into a copper mold to obtain glass. The obtained glass was subjected to differential thermal analysis, and the first crystallization peak temperature was 710°C, and the glass transition temperature was 610°C. The glass was heat-treated at 710°C for 0.5 hours to obtain glass ceramics. XRD analysis shows that the CeOF nanocrystalline phase is distributed in the glass ceramics. Spectral tests show that the glass ceramic can realize white li...

Embodiment 3

[0035] By composition 60SiO 2 -20ZnF 2 -15CeF 3 -2DyF 3 -3EuF 3 Weigh SiO 2 , Al 2 o 3 , CaF 2 , CeF 3 and DyF 3 , and add 0.5mol% As to the above raw material 2 o 5 and 1mol% LiF, after fully mixed, put it into a graphite-corundum double-layer crucible, put it into a melting furnace that has been heated to 1400°C, and melt the raw material into a liquid state. After the melt is kept at 1400°C for 1 hour, from The crucible is quickly taken out from the melting furnace, and the melt in the crucible is quickly poured into a copper mold to obtain a glass sample. According to the DTA curve of the glass, the first crystallization peak temperature is 660°C, and the glass transition temperature is 580°C. The glass is heat-treated at 630°C for 2 hours to obtain glass ceramics. XRD analysis shows that the CeF3 nanocrystalline phase is distributed in the glass ceramics. Spectral tests show that the glass ceramic can realize white light emission with a chromaticity close to ...

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Abstract

The invention discloses glass ceramic used for semiconductor illumination, which comprises the following components in percentage by mol: 45 to 60 percent of SiO2, 0 to 20 percent of Al2O3, 0 to 15 percent of Na2O, 0 to 20 percent of ZnF2, 12 to 20 percent of CeF3, 1 to 3 percent of DyF3 and 1 to 3 percent of EuF3. The glass ceramic is prepared by adopting a high-temperature melting and thermal treatment process, and the method is simple, pollution-free and low in cost. The glass ceramic of the invention has the characteristics of wide exciting wavelength, high luminous brightness, ultraviolet radiation resistance, and good chemical stability and thermal stability. A novel LED illumination device can be made by matching the glass ceramic with an ultraviolet, purple-light or blue-light LED.

Description

field of invention [0001] The invention relates to a glass ceramic used in semiconductor lighting and a preparation method thereof, in particular to a glass ceramic used in a white LED lighting device and a preparation method thereof. Background technique [0002] In recent years, due to the rapid development of blue light, purple light and ultraviolet light LED (Light Emitting Diode, light emitting diode), it becomes possible for LED lighting devices to replace existing lighting devices in the lighting field. Compared with existing lighting devices, LED lighting has many advantages such as energy saving, environmental protection, low cost, high efficiency, short response time, long service life, impact resistance and vibration resistance, so it has become an ideal choice for a new generation of lighting devices. [0003] As an environmentally friendly new generation of lighting sources, LED mainly refers to white light LEDs. At present, more mature white LEDs are realized ...

Claims

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Application Information

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IPC IPC(8): C03C10/16F21V9/10F21V9/40
Inventor 樊先平乔旭升赵达亮王锋王民权杨辉章向华
Owner ZHEJIANG UNIV
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