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CaO-MgO-SiO2 series fluorescent glass-ceramics and preparation method thereof

A technology of glass-ceramics and fluorescence, which is applied in the field of luminescent materials and its preparation, can solve the problems of weak luminous intensity and low conversion efficiency of glass materials, and achieve the effect of poor color stability and excellent luminous performance

Inactive Publication Date: 2009-03-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with crystal materials with the same composition, glass materials have weaker luminous intensity and lower conversion efficiency.

Method used

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  • CaO-MgO-SiO2 series fluorescent glass-ceramics and preparation method thereof
  • CaO-MgO-SiO2 series fluorescent glass-ceramics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] CaO-MgO-SiO 2 Fluorescent glass-ceramic, which contains CaO, MgO, SiO 2 、Al 2 o 3 , B 2 o 3 , ZnO, Na 2 O, ZrO 2 and Eu 2 o 3 The raw materials are prepared; the mole percentage of each raw material is shown in Table 1.

[0029] Table 1

[0030]

[0031] The specific preparation process is as follows: First, weigh 50 g of pure raw materials for analysis according to the formula in Table 1, mix the raw materials evenly, pour them into a corundum crucible, and melt them under a reducing atmosphere at a melting temperature of 1550 ° C. Put it into a heat-resistant mold, anneal in a muffle furnace, and keep it at the glass transition temperature Tg (550°C) for 1 hour, then cool down with the furnace, and take out the glass. After that, put the prepared glass in a precision annealing furnace for heat treatment at 1100°C for 4 hours, turn off the power of the precision annealing furnace and automatically lower it to room temperature to obtain ...

Embodiment 2

[0034] CaO-MgO-SiO 2 Fluorescent glass-ceramic, which contains CaO, MgO, SiO 2 、Al 2 o 3 , B 2 o 3 , ZnO, Na 2 O, ZrO 2 and Eu 2 o 3 The raw materials are prepared; the mole percentage of each raw material is shown in Table 2.

[0035] Table 2

[0036]

[0037] The specific preparation process is as follows: First, weigh 50 g of the pure raw material for analysis according to the formula in Table 2, mix the raw material evenly, pour it into a corundum crucible and melt it, and melt it under a reducing atmosphere at a melting temperature of 1500 ° C for 2 hours. The liquid is poured into cold water, the water-quenched glass is ground, passed through a 200-mesh sieve, and then pressed into a steel mold under 80MPa, and the glass is taken out for crystallization heat treatment. After that, place the pressed glass sheet in a precision annealing furnace for heat treatment at 1150°C for 3 hours, turn off the power of the precision annealing furnace a...

Embodiment 3

[0040] CaO-MgO-SiO 2 The preparation method of fluorescent glass-ceramic, it comprises the steps:

[0041] 1) Selection of raw materials, according to the mole percentage of each raw material: CaO: 15%, MgO: 15%, SiO 2 : 56%, Al 2 o 3 : 5%, ZnO: 4%, Eu 2 o 3 : 5%, take the raw material and set aside;

[0042] 2) CaO, MgO, SiO 2 、Al 2 o 3 , ZnO and Eu 2 o 3 After mixing the raw materials evenly, pour them into a corundum crucible, and melt them in a reducing atmosphere at a melting temperature of 1400°C and keep them warm for 1 hour to obtain molten glass;

[0043] 3) Pour the molten glass into a heat-resistant mold, and keep it in the muffle furnace at the glass transition temperature Tg (600°C) for 1 hour; turn off the power of the muffle furnace and automatically lower it to room temperature, and take out the glass (for crystallization treatment) ;

[0044] 4) Put the glass in a precision annealing furnace for heat treatment at 1000°C for 1 hour, turn off the pow...

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Abstract

The invention belongs to a luminescent material and preparation thereof, and in particular relates to fluorescence glass ceramics and a preparation method thereof. CaO-MgO-SiO2 fluorescence glass ceramics are characterized by comprising raw materials of CaO, MgO, SiO2, Al2O3, B2O3, ZnO, Na2O, ZrO2(OR TiO2), and Eu2O3. The molar percentage compositions of the raw materials are as follows: 15 to 20 percent of CaO, 10 to 16 percent of MgO, 56 to 60 percent of SiO2, 3.5 to 5 percent of Al2O3, 0 to 2 percent B2O3, 1 to 4 percent The preparation method is as follows: manufacturing glass melting method first and then carrying out of ZnO, 0 to 1.5 percent of Na2O, 0 to 4 percent of ZrO2(or TiO2), and 0.01 to 5 percent of Eu2O3. heat treatment of the glass to obtain the glass ceramic containing micro crystals. Fluorescence glass ceramics made by the method has good luminous property of crystalline material and excellent stability of glass material. The glass ceramic can be used for a white light LED element to solve the problem of poor stability of the prior white light LED element.

Description

technical field [0001] The invention belongs to luminescent material and its preparation, in particular to a fluorescent glass-ceramic and its preparation method. Background technique [0002] All solid white light emitting diode (light emitting diode, LED), as a new type of lighting source, has many advantages such as energy saving, environmental protection, long life, and strong designability. a revolution in the world. [0003] The realization of white LED is based on the successful research and development of red, green and blue three primary color chips and various phosphors. At present, the methods for LED to realize white light are as follows: the blue LED chip is coated with phosphor powder that emits yellow light that can be excited by blue light, and the two kinds of light are mixed to form white light; the blue LED chip is coated with red light and green light that can be excited by blue light. Phosphor powder, three kinds of light mixed to form white light; vio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/06C03C4/12
Inventor 程金树汤李缨李宏田培静郑伟宏谢俊陆平
Owner WUHAN UNIV OF TECH
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