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Ce:YAG glass ceramic as well as preparation method and application thereof

A technology of glass-ceramic and glass frit, which is applied in the field of LED fluorescent materials, can solve the problems of unreasonable material composition design, complex glass-ceramic preparation process, and low transparency of glass-ceramic, and achieve low glass transition temperature and low cost , the effect of high transparency

Active Publication Date: 2015-12-30
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In short, there have been some invention patents for glass-ceramics used in white LEDs published at home and abroad so far, but mainly due to the unreasonable design of material composition, the high refractive index of Ce:YAG crystallite particles and the low matrix glass. The refractive index mismatch leads to low transparency and poor optical performance of glass-ceramic; at the same time, the preparation process of glass-ceramic is relatively complicated, the melting temperature is high, and energy consumption is large

Method used

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  • Ce:YAG glass ceramic as well as preparation method and application thereof
  • Ce:YAG glass ceramic as well as preparation method and application thereof
  • Ce:YAG glass ceramic as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0042] will analyze pure SiO 2 、H 3 BO 3 , PbO, ZnO, Ce:YAG phosphor, according to 8mol% SiO 2 , 35mol% B 2 o 3 , 46mol%PbO, 11mol%ZnO, 5wt%Ce:YAG phosphors are accurately weighed and placed in an agate mortar, mixed and ground evenly in the agate mortar, placed in a corundum crucible, and then placed in a resistance furnace After heating to 650°C, keep it warm for 1 hour, then take out the glass melt and quickly pour it into a cast iron mold with a temperature of 400°C, then place it in a muffle furnace for annealing, keep it at 350°C for 2 hours, and finally cool it down to 20 ℃ to form transparent Ce:YAG glass-ceramics.

[0043] The prepared transparent Ce:YAG glass-ceramic was tested for its phase and spectral properties, and its XRD pattern is as follows figure 2 As shown, the XRD diffraction peaks of the fluorescent glass sample are consistent with the main diffraction peaks of the standard card of the YAG crystal phase, indicating that the Ce:YAG powder has been ...

Embodiment 2

[0045] will analyze pure SiO 2 、H 3 BO 3 , PbO, ZnO, Ce:YAG phosphor, according to 7mol% SiO 2 , 35mol% B 2 o 3 , 47mol%PbO, 11mol%ZnO, 5wt%Ce:YAG phosphors are accurately weighed and placed in an agate mortar, mixed and ground evenly in the agate mortar, placed in a corundum crucible, and then placed in a resistance furnace After heating to 700°C, keep it warm for 1 hour, then take out the glass melt and quickly pour it into a cast iron mold with a temperature of 400°C, then place it in a muffle furnace for annealing, keep it at 350°C for 2 hours, and finally cool it down to 20 ℃ to form transparent Ce:YAG glass-ceramics.

[0046] Coupling transparent Ce:YAG glass-ceramics with a 460nm blue light chip can emit bright white light under blue light excitation. Excited by a wavelength of 460nm, the emission peak wavelength is located at 538nm, and the luminous efficiency can reach 133lm / W under the excitation of a current of 20mA.

Embodiment 3

[0048] will analyze pure SiO 2 、H 3 BO 3 , PbO, ZnO, Ce:YAG phosphor, according to 6mol% SiO 2 , 35mol% B 2 o 3 , 48mol%PbO, 11mol%ZnO, 5wt%Ce:YAG phosphors are accurately weighed and placed in an agate mortar, mixed and ground evenly in the agate mortar, placed in a corundum crucible, and then placed in a resistance furnace After heating to 750°C, hold it for 1 hour, then take out the glass melt and quickly pour it into a cast iron mold with a temperature of 400°C, then place it in a muffle furnace for annealing, keep it at 350°C for 2 hours, and finally cool it down to 20 ℃ to form transparent Ce:YAG glass-ceramics.

[0049] Coupling transparent Ce:YAG glass-ceramics with a 460nm blue light chip can emit bright white light under blue light excitation. Excited by a wavelength of 460nm, the emission peak wavelength is located at 538nm, and the luminous efficiency can reach 124lm / W under the excitation of a current of 20mA.

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Abstract

The invention discloses Ce:YAG glass ceramic as well as a preparation method and an application thereof. The Ce:YAG glass ceramic is prepared by active ingredients SiO2, B2O3, PbO, ZnO and Ce: YAG fluorescent powder, and on the basis of the SiO2, B2O3, PbO and ZnO, the content of each active ingredient is as follows (by molar fraction or mass fraction): 2 to 20 percent of SiO2, 10 to 35 percent of B2O3, 20 to 50 percent of PbO, 5 to 15 percent of ZnO and 2 to 10 percent of Ce:YAG fluorescent powder. According to the prepared Ce: YAG glass ceramic, the Ce: YAG microcrystal particles are uniformly distributed in the glass, so that the Ce:YAG glass ceramic has advantages of high transparency, low cost, excellent optical performance and the like. The invention also provides an application of the Ce:YAG glass ceramic in preparing a white-light LED (light emitting diode) device. By adopting the Ce:YAG glass ceramic, the sealing structure of the white-light LED device can be optimized, the process is simplified, and the lighting effect is improved.

Description

(1) Technical field [0001] The invention relates to a Ce:YAG glass-ceramic, a preparation method thereof and an application in white light LEDs, belonging to the technical field of LED fluorescent materials. (2) Background technology [0002] White light LED has the advantages of small size, low calorific value, low power consumption, long life, fast response, environmental protection, planar packaging, and easy development into thin, light and compact products. Generation lighting source", the application prospect is very broad. At present, white LED fluorescent materials mainly use amorphous phosphor powder as the main body. The commercialized white LED products are based on the combination of chip and phosphor powder to form white light. The phosphor powder is mixed in epoxy resin and coated on the InGaN chip. Its working principle is through the combination of blue light InGaN chip and phosphor powder (or other combination methods), the blue light emitted by the InGaN c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/02C03C4/12
Inventor 梁晓娟宫毛高向卫东黄俊
Owner WENZHOU UNIVERSITY
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