Sm3+ doped wollastonite glass ceramic and preparation method thereof

A technology of glass-ceramic and wollastonite, applied in the field of materials, can solve the problems of difficulty in heat dissipation, difficulty in distribution, lack of independent intellectual property rights, etc., and achieve the effect of increasing the content of wollastonite crystal phase and overcoming instability

Inactive Publication Date: 2016-12-07
SHANGLUO UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, LED white light lighting has made some progress, but the white light LED with phosphor as luminescent material has encountered packaging problems, its physical and chemical stability is poor, the particle size and shape are uneven, and the application field is limited.
Traditional phosphors need to consume a lot of resin or silicone materials in the packaging process. These materials will age rapidly due to heat dissipation difficulties under high temperature heat or ultraviolet radiation, which will greatly reduce the service life of LEDs; on the other hand, controlling the epoxy resin in It is also very difficult to evenly distribute the phosphor powder and the thickness around the chip
In addition, some foreign companies monopolize LED lighting technology patents, and the country lacks independent intellectual property rights [1]

Method used

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  • Sm3+ doped wollastonite glass ceramic and preparation method thereof
  • Sm3+ doped wollastonite glass ceramic and preparation method thereof
  • Sm3+ doped wollastonite glass ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Preparation of wollastonite luminescent glass

[0031] Weigh 3.00g of silicon dioxide, 0.90g of calcium oxide, 0.30g of aluminum oxide, 0.58g of sodium carbonate, 0.43g of potassium carbonate, 0.40g of sodium fluoride, and 0.0076g of samarium trioxide. Add an appropriate amount of absolute ethanol to grind to make it fully mixed, then transfer it to a corundum crucible, and place it in a high-temperature furnace at 1400°C (5°C / min) for 2 hours. After the heat preservation is over, quickly take out the glass liquid and pour it into cooling deionized water Glass particles are obtained which, after drying, give wollastonite glass.

Embodiment 2

[0032] Example 2: Two-step sintering method to prepare the crystal structure of wollastonite luminescent glass-ceramics

[0033] Put the wollastonite glass obtained in Example 1 in a muffle furnace, raise the temperature at a rate of 5 °C / min to 850 °C for 2 hours for nucleation, and then increase the rate of temperature at 2 °C / min to 1007 °C for crystallization 2h, to obtain wollastonite glass-ceramics.

[0034] Depend on figure 1 It can be seen that wollastonite glass-ceramic was prepared by two-step sintering method, and the crystallinity was 58.95%.

Embodiment 3

[0035] Example 3: One-step sintering method to prepare the crystal structure of wollastonite luminescent glass-ceramics

[0036] The wollastonite glass obtained in Example 1 was placed in a muffle furnace, and the temperature was raised to 1050° C. at a rate of 5° C. / min for 1.5 hours to obtain wollastonite glass-ceramics.

[0037] Depend on figure 1 It can be seen that wollastonite glass-ceramic was prepared by one-step sintering method, and the crystallinity was 65.72%. The method crystallinity is 6.77% higher.

[0038] Example 4: One-step sintering method to prepare wollastonite luminescent glass-ceramics Effect of temperature on crystal structure

[0039] Place the wollastonite glass obtained in Example 1 in a muffle furnace, and raise the temperature to 850°C, 900°C, 950°C, 1000°C, 1050°C, and 1100°C at different heat treatment temperatures at a rate of 5°C / min. Heat preservation for 1.5 hours to obtain wollastonite glass-ceramics at different sintering temperatures. ...

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Abstract

The invention discloses Sm3+ doped wollastonite glass ceramic and a preparation method thereof. Sm3+ activated luminescent glass ceramic using wollastonite (CaSiO3) as a main crystal phase is prepared by means of sintering; the wollastonite glass ceramic is SiO2-CaO-Al2O3 glass ceramic, the ratio of SiO2, CaO and Al2O3 is 57.4:18.4:3.3, Sm3+ accounts for 0.01-0.09% by mol of total mass of the SiO2-Cao-Al2O3 glass ceramic according to percentage by weight, such system can be excited under near-ultraviolet wavelength of 413 nm to emit orange red light of 590 nm, crystallization degree under thermal treatment temperature of 1050 DEG C is up to 65.72%, fluorescent strength under such temperature preparation condition is highest, and concentration quenching occurs if Sm3+ doping exceeds 0.05%. The results show that the Sm3+ doped diopside glass ceramic can be excited by blue ultraviolet to produce stable red light, and stable red light supplementary material can be provided for white LEDs.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a doped Sm 3+ Wollastonite-based glass-ceramics and a preparation method thereof. Background technique [0002] At present, LED white light lighting has made some progress, but the white light LED with phosphor as luminescent material has encountered packaging problems, its physical and chemical stability is poor, the particle size and shape are uneven, and the application field is limited. Traditional phosphors need to consume a lot of resin or silicone materials in the packaging process. These materials will age rapidly due to heat dissipation difficulties under high temperature heat or ultraviolet radiation, which will greatly reduce the service life of LEDs; on the other hand, controlling the epoxy resin in It is also very difficult to evenly distribute the phosphor powder and the thickness around the chip. In addition, some foreign companies monopolize LED lighting technology pate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/06C03C6/06C03C4/12C03B32/02
CPCC03B32/02C03C1/00C03C4/12C03C10/0036
Inventor 苗波波赵亚娟江元汝亢小红甘俊羊孙强强陈利君
Owner SHANGLUO UNIV
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