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A kind of spontaneous crystallization fluorescent glass-ceramic for warm white LED and preparation method thereof

A technology of glass-ceramics and spontaneous crystallization, applied in glass manufacturing equipment, glass molding, manufacturing tools, etc., can solve problems such as low luminous efficiency, low quality of precipitated crystal phase, easy erosion of phosphors, etc., and achieve safety And the effect of enhanced convenience of operation, simple preparation method and low cost

Active Publication Date: 2021-09-21
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these two methods have the following disadvantages: one is that the spectra produced by the two phosphors will overlap and reabsorb, resulting in low luminous efficiency; efficiency; the third is that the crystallization temperature is too high, and the quality of the precipitated crystal phase is not high

Method used

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  • A kind of spontaneous crystallization fluorescent glass-ceramic for warm white LED and preparation method thereof
  • A kind of spontaneous crystallization fluorescent glass-ceramic for warm white LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The warm white light LED prepared in this embodiment can spontaneously crystallize fluorescent glass-ceramic, and its composition is Y 2 o 3 , MgO, Al 2 o 3 , SiO 2 , MgF 2 , CeO 2 、H 3 BO 3 、Na 2 CO 3 , the respective molar percentages are 13.80% Y 2 o 3 , 34.50%MgO, 6.90%Al 2 o 3 , 27.60%SiO2 2 , 6.90%MgF 2 , 0.83%CeO 2 , 7.10%H 3 BO 3 , 2.37%Na 2 CO 3 , Weigh the raw materials and place them in an agate mortar to grind them evenly. Put the ground mixture into a corundum crucible, put the corundum crucible into the lifting furnace, and keep it in the lifting furnace at 1500°C for 90 minutes. The mixture in the corundum crucible is heated at high temperature Melt to form a molten liquid, then take out the corundum crucible and pour the molten liquid on the steel plate to form it, quickly transfer it to an environment of 700 ° C for 3 hours for annealing treatment, and obtain a glass-ceramic, then cool to room temperature and remove the glass-ceramic ...

Embodiment 2

[0040] The warm white light LED prepared in this embodiment can spontaneously crystallize fluorescent glass-ceramic, and its composition is Y 2 o 3 , MgO, Al 2 o 3 , SiO 2 , MgF 2 , CeO 2 、H 3 BO 3 、Na 2 CO 3 , the respective molar percentages are 10.25% Y 2 o3 , 32.64%MgO, 6.13%Al 2 o 3 , 24.51%SiO2 2 , 6.13%MgF 2 , 0.74%CeO 2 , 14.70%H 3 BO 3 , 4.90%Na 2 CO 3 , Weigh the raw materials and place them in an agate mortar to grind evenly. Put the ground mixture into a corundum crucible, put the corundum crucible into the lifting furnace, and keep it in the lifting furnace at 1460°C for 60 minutes. The mixture in the corundum crucible is heated at high temperature. Melt to form a molten liquid, then take out the corundum crucible, pour the molten liquid on the steel plate to form, quickly transfer to an environment of 650 ° C for 3 hours for annealing treatment, and obtain glass-ceramic, then cool to room temperature and remove the glass-ceramic from the steel p...

Embodiment 3

[0042] The warm white light LED prepared in this embodiment can spontaneously crystallize fluorescent glass-ceramic, and its composition is Y 2 o 3 , MgO, Al 2 o 3 , SiO 2 , MgF 2 , CeO 2 、H 3 BO 3 、Na 2 CO 3 , the respective molar percentages are 13.11%Y 2 o 3 , 32.78%MgO, 6.55%Al 2 o 3 , 26.22%SiO2 2 , 6.55%MgF 2 , 0.79%CeO 2 , 10.49%H 3 BO 3 , 3.51%Na 2 CO 3 , weigh the raw materials and place them in an agate mortar to grind them evenly. Put the ground mixture into a corundum crucible, put the corundum crucible into the lifting furnace, and keep it in the lifting furnace at 1480°C for 60 minutes. The mixture in the corundum crucible is heated at high temperature Melt to form a molten liquid, then take out the corundum crucible, pour the molten liquid on the steel plate to form, quickly transfer to an environment of 650 ° C for 3 hours for annealing treatment, and obtain glass-ceramic, then cool to room temperature and remove the glass-ceramic from the st...

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Abstract

The invention discloses a fluorescent glass-ceramics capable of spontaneous crystallization for warm white LEDs and a preparation method thereof. The fluorescent glass-ceramics capable of spontaneous crystallization is composed of the following molar percentage components: 5-20% Y 2 o 3 , 20‑40% MgO, 2‑20% Al 2 o 3 , 15‑40% SiO 2 , 5‑20% MgF 2 , 0.2‑2% CeO 2 , 2-30%H 3 BO 3 , 0‑30% Na 2 CO 3 and 0‑15% Li 2 CO 3 . Compared with the YAG standard card, the spontaneous crystallization glass-ceramics prepared by the present invention does not contain impurity phases, has a simple preparation method, low cost, and can be mass-produced. Spontaneous crystallization can be realized by changing the ratio of specific components in raw materials. The glass-ceramics prepared by the present invention can emit yellow-orange light with a main peak wavelength of 600-613 nm under the excitation of 467 nm blue light, which has a significant red shift with YAG phosphor powder with an emission peak wavelength of 528 nm, and is combined with a blue light chip After that, warm white light can be obtained.

Description

technical field [0001] The invention relates to luminescent materials applied to LED lighting, in particular to a fluorescent glass-ceramic capable of spontaneous crystallization for warm white LEDs and a preparation method thereof. Background technique [0002] At present, most commercial white LEDs mainly consist of blue chips and Y 3 AI 5 o 12 : Ce 3+ (YAG) phosphor-converted LEDs made of yellow phosphor. However, the organic adhesives in LED devices are prone to aging and yellowing due to the heat emitted by the chip, which will adversely affect the luminous efficiency and color temperature of the device, thereby reducing the long-term reliability and lifespan of the product. To solve this problem, replacing phosphors and organic binders with inorganic fluorescent glass-ceramics is a promising way. So far, there are two main methods of preparing white LED fluorescent glass-ceramics. One is to dope the glass matrix with yellow phosphor YAG, and the other is to heat-t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/16C03C4/12C03B19/02
CPCC03B19/02C03C4/12C03C10/16
Inventor 潘再法王瑞平邵康王锴闻莹婷
Owner ZHEJIANG UNIV OF TECH
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