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Novel Eu<3+> and Mn<2+> co-doped tungstate red fluorescent material and preparation method thereof

A red fluorescence and co-doping technology, applied in the field of red fluorescent materials, can solve problems such as daily application performance limit, achieve good thermal quenching properties and luminous efficiency, simple and easy preparation method, and excellent performance.

Inactive Publication Date: 2015-12-30
JINGGANGSHAN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Diode (LED) technology has achieved good development in the 1950s, but it is mainly concentrated on red and blue LEDs, and its daily application performance is limited; later, with the development of blue gallium nitride and long-wave ultraviolet laser diode (LED) technology The breakthrough and industrialization of solid-state white light lighting sources have attracted people's interest again
Currently, about Eu 3+ and Mn 2+ The research on co-doped luminescent materials has been concerned and reported, such as: Ca 3 (VO 4 ) 2 :Eu 3+ , Mn 2+ , Zn 2 SiO 4 :Eu 3+ , Mn 2+ , Zn 3 (BO 3 ) 2 :Eu 3+ , Mn 2+ , CdSiO 3 :Eu 3+ , Mn 2+ and Ba 2 SiO 3 Cl 2 :Eu 3+ , Mn 2+ etc., but for Eu 3+ and Mn 2+ Co-doped tungstates have not been studied

Method used

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  • Novel Eu&lt;3+&gt; and Mn&lt;2+&gt; co-doped tungstate red fluorescent material and preparation method thereof
  • Novel Eu&lt;3+&gt; and Mn&lt;2+&gt; co-doped tungstate red fluorescent material and preparation method thereof
  • Novel Eu&lt;3+&gt; and Mn&lt;2+&gt; co-doped tungstate red fluorescent material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh the compound raw materials containing calcium (Ca), strontium (Sr) or barium (Ba), the compound raw materials containing tungsten, the compound raw materials containing europium and the compound raw materials containing manganese as starting materials, according to the element molar ratio R:W :Eu:Mn=(1-x-y):1:x:y, accurately weigh the four raw materials respectively, where x is 0.001, 0.002, 0.004, 0.006, 0.008, 0.01, 0.03, 0.06, 0.08, 0.1, y Take 0.001, 0.002, 0.004, 0.006, 0.008, 0.01, 0.03, 0.06, 0.08, 0.1 respectively, R is expressed as: calcium (Ca), strontium (Sr) or barium (Ba). ① Weigh the four raw materials of calcium carbonate, tungsten oxide, europium oxide and manganese dioxide respectively, and control the total weight of the mixture to be about 50 grams. After 50 grams of the mixture were mixed by ball milling, they were put into a corundum crucible, and then the crucible was put into a high-temperature electric furnace. Precisely control the heatin...

Embodiment 2

[0036] Select calcium (Ca), strontium (Sr) or barium (Ba) oxides, carbonates containing tungsten, europium carbonate and manganese carbonate as starting materials, according to the element molar ratio R:W:Eu:Mn=(1 -x-y):1:x:y, accurately weigh four kinds of raw materials, respectively, where 0.001≤x≤0.1 and 0.001≤y≤0.1, R is expressed as: calcium (Ca), strontium (Sr) or barium (Ba). The total weight of the control mixture is about 50 grams. After 50 grams of the mixture were mixed by ball milling, they were put into a corundum crucible, and then the crucible was put into a high-temperature electric furnace. Precisely control the heating rate, control the decomposition reaction rate of the compound raw materials, prevent the mixture from overflowing from the crucible, and pre-fire the sample at 500°C for 5 hours in an air atmosphere. Take out the pre-fired sample, grind and mix it again, put it into a crucible, burn it at 1150°C for 8 hours in the air atmosphere, and cool it t...

Embodiment 3

[0038] Select calcium (Ca), strontium (Sr) or barium (Ba) nitrate, tungsten-containing chloride, europium carbonate and manganese carbonate as starting materials, according to the element molar ratio R:W:Eu:Mn=(1- x-y):1:x:y, accurately weigh four kinds of raw materials respectively, among which 0.001≤x≤0.1 and 0.001≤y≤0.1, R is expressed as: calcium (Ca), strontium (Sr) or barium (Ba). The total weight of the control mixture is about 50 grams. After 50 grams of the mixture were mixed by ball milling, they were put into a corundum crucible, and then the crucible was put into a high-temperature electric furnace. Precisely control the heating rate, control the decomposition reaction rate of the compound raw materials, prevent the mixture from overflowing from the crucible, and pre-fire the sample at 400°C for 5 hours in an air atmosphere. Take out the pre-fired sample, grind and mix it again, put it into a crucible, burn it at 1250°C for 6 hours in the air atmosphere, and cool ...

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Abstract

The invention provides a novel Eu<3+> and Mn<2+> co-doped tungstate red fluorescent material and a preparation method thereof. The red fluorescent material adopts a crystal structure of a tetragonal system, and has a molecular formula of R(1-x-y)WO4:xEu<3+>,yMn<2+>, wherein R represents Ca, Sr or Ba. The preparation method comprises the following steps: correctly weighing a compound material containing Ca, Sr and Ba, a compound material containing W, a compound material containing Eu and a compound material containing Mn respectively; grinding the compound materials for uniform mixing, and then carrying out 3-5 hours' pre-burning in the air atmosphere at 450-600 DEG C; taking out a pre-burnt sample, grinding the pre-burnt sample for uniform mixing, carrying out 5-8 hours' high-temperature burning in the air atmosphere at 1150-1300 DEG C, and carrying out furnace cooling to room temperature, so as to obtain the red fluorescent material.

Description

technical field [0001] The invention relates to the field of red fluorescent materials, in particular to novel Eu 3+ and Mn 2+ Co-doped tungstate red fluorescent material and preparation method thereof. Background technique [0002] With the emergence of energy crisis and environmental pollution, people are looking for alternative energy sources and advanced technologies that can protect the environment. Diode (LED) technology has achieved good development in the 1950s, but it is mainly concentrated on red and blue LEDs, and its daily application performance is limited; later, with the development of blue gallium nitride and long-wave ultraviolet laser diode (LED) technology The breakthrough and industrialization of solid-state white light lighting sources have once again attracted people's interest. In the lighting industry, white LEDs have many obvious advantages over traditional incandescent lamps and fluorescent lamps, such as: LED light source has no radiation such a...

Claims

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Application Information

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IPC IPC(8): C09K11/68
Inventor 曹人平徐海东彭德东余晓光
Owner JINGGANGSHAN COLLEGE
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