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A transparent CE:YAG glass-ceramic and its application in white LED

A technology of glass-ceramics and glass, applied in the field of inorganic materials, to achieve the effects of saving energy, simplifying the preparation process, and simple preparation methods

Active Publication Date: 2017-03-08
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no report on the preparation of spontaneous crystallization of Ce:YAG glass-ceramics for white LEDs by one-step melting cooling method

Method used

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  • A transparent CE:YAG glass-ceramic and its application in white LED
  • A transparent CE:YAG glass-ceramic and its application in white LED
  • A transparent CE:YAG glass-ceramic and its application in white LED

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Analytical pure SiO 2 , Al 2 O 3 , Y 2 O 3 , PbO, CeF 3 , B 2 O 3 , by 20 parts SiO 2 : 19.5 parts Al 2 O 3 : 9.5 parts Y 2 O 3 : 46 parts PbO: 0.5 parts CeF 3 : 5 parts B 2 O 3 The proportion of (molar fraction) is accurately weighed and placed in an agate mortar, mixed in an agate mortar and evenly ground, placed in a corundum crucible, placed in a resistance furnace, heated to 1450 ° C, and kept for 2 hours to make it After melting, the glass melt was taken out and quickly poured into a cast iron mold with a temperature of 650 ° C, then placed in a muffle furnace for annealing, kept at 800 ° C for 3 hours, and then cooled to 20 ° C with the furnace to form spontaneous crystallization transparent Ce:YAG glass-ceramic.

[0044] The spectral properties of the prepared Ce:YAG glass-ceramics were tested, and the XRD patterns were as follows figure 2 As shown in the figure, the XRD diffraction peaks of the glass-ceramic samples are consistent with the main...

Embodiment 2

[0046] Analytical pure SiO 2 , Al 2 O 3 , Y 2 O 3 , PbO, CeF 3 , B 2 O 3 , by 23 parts SiO 2 : 19 parts Al 2 O 3 : 9 copies of Y 2 O 3 : 45 parts PbO: 0.5 parts CeF 3 : 4 parts B 2 O 3 The proportion of (molar fraction) is accurately weighed and placed in an agate mortar, mixed in an agate mortar and evenly ground, then placed in a corundum crucible, heated to 1500 ℃ in a resistance furnace, and kept for 2 hours to make it After melting, the glass melt was taken out and quickly poured into a cast iron mold with a temperature of 650 ° C, then placed in a muffle furnace for annealing, kept at 800 ° C for 3 hours, and then cooled to 20 ° C with the furnace to form spontaneous crystallization transparent Ce:YAG glass-ceramic. Coupling the glass-ceramic with a 460 nm blue light chip can emit bright white light under blue light excitation. The obtained glass-ceramic is excited by the wavelength of 460nm, the maximum wavelength can reach 534nm, and the luminous effici...

Embodiment 3

[0048] Analytical pure SiO 2 , Al 2 O 3 , Y 2 O 3 , PbO, CeF 3 , B 2 O 3 , by 25 parts SiO 2 : 20 parts Al 2 O 3 : 10 copies of Y 2 O 3 : 43 parts PbO: 0.5 parts CeF 3 : 3 parts B 2 O 3 The ratio of (molar fractions) is accurately weighed and placed in an agate mortar, mixed in an agate mortar and evenly ground, placed in a corundum crucible, placed in a resistance furnace, heated to 1600 ° C, and kept for 2 hours to make it After melting, the glass melt was taken out and quickly poured into a cast iron mold with a temperature of 650 ° C, then placed in a muffle furnace for annealing, kept at 800 ° C for 3 hours, and then cooled to 20 ° C with the furnace to form spontaneous crystallization transparent Ce:YAG glass-ceramic. Coupling the glass-ceramic with a 460 nm blue light chip can emit bright white light under blue light excitation. The obtained glass-ceramic is excited by a wavelength of 460 nm, the maximum wavelength can reach 532 nm, and the luminous effi...

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Abstract

The invention discloses transparent Ce:YAG microcrystalline glass and application of the transparent Ce:YAG microcrystalline glass in a white LED. The microcrystalline glass is self-crystallized, and is prepared from the following active materials in percentage by mole: 19-30mol% of SiO2, 15-30mol% of Al2O3, 5-20mol% of Y2O3, 40-60mol% of PbO, 0.5-5mol% of CeF3 and 2-10mol% of B2O3, wherein the sum of the mole percentage of the components is 100 percent. The Ce:YAG microcrystalline glass disclosed by the invention meets the requirements that the glass melting temperature is low, a preparation method is simple, the raw materials are readily available, the production cycle is short, the batch production is easily realized, and the glass is stable in physicochemical properties, high in uniformity, long in service life and high in heat conductivity; and moreover, the Ce:YAG microcrystalline glass emits bright yellow light under blue light excitation of 465nm, the yellow light and blue light are combined to generate strong white light, and the microcrystalline glass can be used for preparing the white LED.

Description

technical field [0001] The invention relates to the field of inorganic materials, in particular to a transparent Ce:YAG glass-ceramic and its application in white light LEDs. Background technique [0002] White light-emitting diodes (white light-emitting diodes), which have many advantages such as small solidification, vibration resistance, fast response speed (μs), energy saving and long life (10,000 hours), green and high efficiency, have attracted great attention. At present, white LED fluorescent materials mainly use amorphous phosphors as the main body, and commercial white LED products are made by packaging blue InGaN chips and phosphors together. When the LED emits light, it will generate a lot of heat. Generally, the temperature around the lighted chip will reach 150°C to 200°C. Such a temperature will cause the efficiency of the phosphor to drop by 20-30%, resulting in a shift between the color temperature and the color coordinates of the light source. At the same...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/16
Inventor 梁晓娟黄俊向卫东
Owner WENZHOU UNIVERSITY
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