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Ce: YAG microcrystalline glass and application thereof in white-light LED

A glass-ceramic and glass technology, applied in the field of LED fluorescent materials, can solve the problems of inability to use commercial blue light chips, poor optical performance of glass-ceramic, poor uniformity of rare earth ions, etc., and achieves low cost, stable physical and chemical properties, and excitation and emission efficiency. high effect

Active Publication Date: 2015-04-22
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above two kinds of glass-ceramics containing rare-earth-doped YAG phase, there are only 2-3 kinds of glass-ceramic components, and the glass-ceramics is basically transparent. The uniformity is also poor, the YAG crystallite particles are larger, the nanoscale YAG crystallite particles are less, the rare earth ions in the YAG lattice are less, and the optical properties of the glass-ceramics are poor
CN102092951A, titled transparent glass-ceramic material for ultraviolet light excitation white light LED and its preparation technology, the crystal phase contained in glass-ceramic in this patent is Dy:CeF 3 , the material cannot be excited by a commercial blue chip to produce white emission
The material has poor transparency and poor luminous performance
CN102765883A discloses a preparation method of yttrium aluminum garnet glass-ceramics, which is characterized in that PbO-Y 2 o 3 -Al 2 o 3 -SiO 2 Glass system, by adjusting PbO and SiO 2 Adjust the refractive index of the glass, realize the matching of the refractive index of the YAG crystallite and the glass matrix, and make a transparent YAG glass-ceramic, but PbO is volatile at high temperature, which will have a certain impact on the environment

Method used

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  • Ce: YAG microcrystalline glass and application thereof in white-light LED

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 22.26 parts by mole Y 2 o 3 , 37.22 Al 2 o 3 , 31.30 parts of SiO 2 , 2.72 parts AlF 3 , 4.63 parts of ZrO 2 and additionally doped with 1.91 parts of CeF 3Accurately weigh and analyze pure raw materials, then put them into an agate mortar, mix and grind evenly, and then melt them in a crucible at a temperature of 1600°C. After 2 hours of heat preservation, pour the glass melt into a cast iron mold, and then place it at high temperature Annealing in the furnace, after holding for 2 hours at the glass transition temperature Tg, then cooling down to 50°C with the furnace, turning off the power supply of the high temperature furnace to automatically cool down to room temperature, taking out the glass, and then placing the prepared glass in a precision annealing furnace at 1250 ℃ for 2 hours, then cooled to 50 ℃ with the furnace, turned off the power of the precision annealing furnace, and automatically cooled to room temperature to obtain a translucent yttrium alumin...

Embodiment 2

[0034] 21.66 parts by mole Y 2 o 3 , 36.21 Al 2 o 3 , 34.99 parts of SiO 2 , 2.65 parts AlF 3 , 4.50 parts of ZrO 2 and additionally doped with 1.82 parts of CeF 3 Accurately weigh and analyze pure raw materials, then put them into an agate mortar, mix and grind evenly, and then melt them in a crucible at a temperature of 1600°C. After 2 hours of heat preservation, pour the glass melt into a cast iron mold, and then place it at high temperature Carry out annealing in the furnace, keep warm at the glass transition temperature Tg for 2 hours, then cool down to 50°C with the furnace, turn off the power supply of the high temperature furnace and automatically cool down to room temperature, take out the glass, and then place the prepared glass in a precision annealing furnace at 1300 ℃ for 2 hours, then cooled to 50 ℃ with the furnace, turned off the power of the precision annealing furnace, and automatically cooled to room temperature to obtain a translucent yttrium aluminum...

Embodiment 5

[0039] Embodiment 5: Test the spectral properties of the prepared YAG glass-ceramics

[0040] The XRD pattern of the glass obtained in embodiment 1, 2 and comparative example 3 after microcrystallization treatment is as follows respectively figure 1 , figure 2 and image 3 As shown, the result is as follows: the main diffraction peaks of the sample XRD diffraction peaks obtained through heat treatment are consistent with the standard diagram of the YAG crystal phase, and the obtained material crystal phase is a glass-ceramic of the YAG phase, without other impurity phases; Example 1 The emission wavelength of the sample is 538nm ( Figure 5 ) and the emission wavelength of the sample of Example 2 is 534nm ( Figure 7 ) and the emission wavelength of the comparative example 3 sample is 533nm ( Figure 9 ), their respective excitation spectra such as Figure 4 , Figure 6 and Figure 8 As shown, it is similar to the fluorescence spectrum of Ce:YAG crystal, and the fluore...

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Abstract

The invention discloses Ce: YAG microcrystalline glass and application thereof in a white-light LED. The microcrystalline glass is prepared from the following raw materials in mole percentage: 19-24% of Y2O3, 33-39% of Al2O3, 28-40% of SiO2, 4-5% of ZrO2 and 3-5% of a fluoride nucleation agent; the preparation method of the microcrystalline glass comprises the following steps: (1) mixing glass materials; (2) melting glass materials, namely heating the glass materials in a crucible by virtue of a high-temperature resistant furnace, melting at a temperature is 1600-1700 DEG C, preserving heat for 2-5hr, pouring a glass melt on a cast iron mould, then annealing the glass melt in a high-temperature furnace, preserving heat at glass transition temperature Tg for 2-5hr and cooling with the furnace to 50 DEG C; turning off the power supply of the high-temperature furnace, automatically cooling to room temperature and taking out glass; and (3) carrying out insulation treatment, namely carrying out heat treatment on the glass in a precision annealing furnace at 1200-1400 DEG C for 1-10hr, cooling with the furnace to 50 DEG C, turning off the power supply of the precision annealing furnace, and automatically cooling to room temperature so as to obtain the semitransparent Ce: YAG microcrystalline glass.

Description

(1) Technical field [0001] The invention relates to a Ce:YAG glass-ceramic and its 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, the white light LED fluorescent material mainly uses amorphous phosphor as the main body, and the commercialized white light LED product is based on the combination of chip and phosphor to form white light as the mainstream of development. At present, the manufacture of high-efficiency, high color rendering index, low color temperature, and high-power white LEDs has become an urgent need for LED development. Therefore, the performance of fluorescent materials (exci...

Claims

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Application Information

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IPC IPC(8): C03C10/02
Inventor 向卫东宫毛高梁晓娟
Owner WENZHOU UNIVERSITY
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