Topological chemical reduction Eu < 3 + >/Eu < 2 + > co-doped UV-LED white light microcrystalline glass and preparation method thereof

A UV-LED, topological chemistry technology, applied in the field of inorganic non-metallic luminescent materials, to achieve the effect of simple process and high safety factor

Pending Publication Date: 2021-08-17
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For existing Eu 3+ Reduction of Eu 2+ The complexity and security problems that exist in the technological process, the object of the present invention is to provide a kind of topological chemical reduction Eu 3+ / Eu 2+ Co-doped UV-LED white light glass-ceramic and preparation method thereof, direct high-temperature solid phase melting reaction in air, utilizing nitride or carbide reducing agent (such as BN, AlN, Si 3 N 4 , SiC), partially in situ reduced Eu 3+ so as to achieve Eu 3+ with Eu 2+ co-doping, white light is generated under 395nm ultraviolet excitation, and white light glass-ceramic is obtained

Method used

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  • Topological chemical reduction Eu &lt; 3 + &gt;/Eu &lt; 2 + &gt; co-doped UV-LED white light microcrystalline glass and preparation method thereof
  • Topological chemical reduction Eu &lt; 3 + &gt;/Eu &lt; 2 + &gt; co-doped UV-LED white light microcrystalline glass and preparation method thereof
  • Topological chemical reduction Eu &lt; 3 + &gt;/Eu &lt; 2 + &gt; co-doped UV-LED white light microcrystalline glass and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The white light LED glass sample of this embodiment comprises the following components in terms of molar percentages:

[0031] 40SiO 2 -25Al 2 o 3 -18Na 2 CO 3 -10YF 3 -7NaF-0.5Eu 2 o 3 -0.05Si 3 N 4

[0032] (1) Take each required composition raw material respectively by molar percentage;

[0033] (2) Grind and mix the raw materials in an agate mortar, put them into a corundum crucible, and calcine at 1400°C for 45 minutes to completely melt the powder mixture. It is not necessary to carry out under the protection of the atmosphere when melting at high temperature. Can be carried out in the air;

[0034] (3) Pour the material in the molten state onto the preheated copper plate in the muffle furnace, and perform stress relief annealing treatment at 350°C for 3 hours, and then cool to room temperature with the furnace;

[0035](4) Take out the sample from the muffle furnace, then grind the sample into a disc glass with a radius of 30 mm and a thickness of 3 m...

Embodiment 2

[0040] The white light LED glass sample of this embodiment comprises the following components in terms of molar percentages:

[0041] 40SiO 2 -25Al 2 o 3 -18Na 2 CO 3 -10YF 3 -7NaF-0.5Eu 2 o 3 -0.05Si 3 N 4

[0042] (1) Take each required composition raw material respectively by molar percentage;

[0043] (2) Grind and mix the raw materials in an agate mortar, put them into a corundum crucible, and calcine at 1400°C for 45 minutes to completely melt the powder mixture. It is not necessary to carry out under the protection of the atmosphere when melting at high temperature. Can be carried out in the air;

[0044] (3) Pour the material in the molten state onto the preheated copper plate in the muffle furnace, and perform stress relief annealing treatment at 350°C for 3 hours, and then cool to room temperature with the furnace;

[0045] (4) Put the cooled glass sample into a muffle furnace at 560°C for heat treatment for 4 hours;

[0046] (5) Take out the sample from...

Embodiment 3

[0051] The white light LED glass sample of the present embodiment, according to mole percentage, comprises following components:

[0052] 40SiO 2 -25Al 2 o 3 -18Na 2 CO 3 -10YF 3 -7NaF-0.5Eu 2 o 3 -0.1Si 3 N 4

[0053] (1) Take each required composition raw material respectively by molar percentage;

[0054] (2) Grind and mix the raw materials in an agate mortar, put them into a corundum crucible, and calcine at 1400°C for 45 minutes to completely melt the powder mixture. It is not necessary to carry out under the protection of the atmosphere when melting at high temperature. Can be carried out in the air;

[0055] (3) Pour the material in the molten state onto the preheated copper plate in the muffle furnace, and perform stress relief annealing treatment at 350°C for 3 hours, and then cool to room temperature with the furnace;

[0056] (4) Take out the sample from the muffle furnace, then grind the sample into a disc glass with a radius of 30 mm and a thickness of...

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Abstract

The invention discloses topological chemical reduction Eu < 3 + > / Eu < 2 + > co-doped UV-LED white light microcrystalline glass and a preparation method thereof. The topological chemical reduction Eu < 3 + > / Eu < 2 + > co-doped UV-LED white light microcrystalline glass is prepared from, by mole, 40%-60% of SiO2, 10%-25% of Al2O3, 10%-20% of Na2CO3, 8%-15% of YF3, 6%-15% of NaF, 0.1%-0.5% of Eu2O3 and 0.02%-0.1% of a reducing agent, the reducing agent is nitride or carbide, all the raw material components are mixed and ground according to the set proportion, and melting and annealing are carried out to obtain the white light microcrystalline glass. According to the invention, a high-temperature solid-phase melting reaction is directly carried out in air, Eu < 3 + > is partially reduced in situ by using a nitride or carbide reducing agent so as to realize co-doping of Eu < 3 + > and Eu < 2 + >, and white light is generated under excitation of 395nm ultraviolet, so that the white-light microcrystalline glass is obtained.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic luminescent materials, in particular to a topologically chemically reduced Eu that can be synthesized under air conditions. 3+ / Eu 2+ Co-doped UV-LED white light glass-ceramic and preparation method thereof. Background technique [0002] White LED, as a new type of energy-saving light source, has gradually replaced traditional light sources such as incandescent lamps and tungsten lamps. It has advantages in reliability, environmental protection, energy saving and safety, and has attracted widespread attention. [0003] In many published studies, the Eu 3+ reduced to Eu 2 + . The reducing atmosphere usually contains H 2 , N 2 、H 2 Mixed gas, carbon monoxide, argon mixed gas, etc., although Eu can be 3+ Better reduction, but this method has high requirements for high-temperature sintering equipment and carrier gas accessories, and because most of the reducing gases are flamma...

Claims

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Application Information

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IPC IPC(8): C03C10/16C03C6/06C03C6/04C03C4/12C03C1/00
CPCC03C10/16C03C10/0009C03C1/00C03C4/12
Inventor 徐昌富黎佳昕孙立忠
Owner XIANGTAN UNIV
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