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Mn4<+> ion activated corundum phase red light-emitting florescent ceramic and preparation method thereof

A technology of red luminescent and fluorescent ceramics, applied in luminescent materials, chemical instruments and methods, etc., can solve problems such as unsatisfactory physical and chemical stability, and achieve the effect of being suitable for large-scale production, easy to operate, and highly controllable

Inactive Publication Date: 2019-10-22
贵州赛义光电科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above problems, the object of the present invention is to provide a kind of Mn 4+ Ion-activated corundum phase red luminescent fluorescent ceramics and its preparation method, which solves the problem of existing Mn 4+ The physical and chemical stability of ion-activated fluoride red fluorescent materials is not ideal, and HF acid that is harmful to human body and environment is used in the preparation process, etc.

Method used

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  • Mn4&lt;+&gt; ion activated corundum phase red light-emitting florescent ceramic and preparation method thereof
  • Mn4&lt;+&gt; ion activated corundum phase red light-emitting florescent ceramic and preparation method thereof
  • Mn4&lt;+&gt; ion activated corundum phase red light-emitting florescent ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The chemical formula (Al 1-x-y Mn 4+ x M 2+ y ) 2 O 3 In, x=0.00025, y=0.00025.

[0037] Take Al 2 O 3 , MnO 2 And MgO as raw materials, weigh Al 2 O 3 29.96 g, MnO 2 0.03 g, MgO 0.01g. Will Al 2 O 3 , MnO 2 Put the MgO and MgO into a PTFE ball mill, add agate balls and a proper amount of alcohol, and mix for 10 hours with a planetary ball mill.

[0038] After the ball milling stops, the uniformly mixed powder is pressed into a plain embryo through uniaxial pressing-cold isostatic pressing.

[0039] Finally, the raw embryo is put into a corundum tube furnace at 1600°C under normal pressure in a flowing pure oxygen atmosphere for 5 hours to undergo a solid phase reaction, and then the furnace is cooled to obtain a tetravalent manganese ion activated corundum phase red luminescent ceramic.

[0040] An ultraviolet-visible spectrophotometer was used to test the absorption spectrum of the fluorescent material prepared in Example 1 of the present invention, as figure 1 As shown, it...

Embodiment 2

[0046] The chemical formula (Al 1-x-y Mn 4+ x M 2+ y ) 2 O 3 In, x=0.0005, y=0.0005.

[0047] Take Al 2 O 3 , MnO 2 And MgO as raw materials, weigh Al respectively 2 O 3 29.96 g, MnO 2 0.03 g, MgO 0.02 g. Will Al 2 O 3 , MnO 2 Put the MgO and MgO into a PTFE ball mill, add agate balls and a proper amount of alcohol, and mix for 10 hours with a planetary ball mill.

[0048] After the ball milling stops, the uniformly mixed powder is pressed into a plain embryo through uniaxial pressing-cold isostatic pressing.

[0049] Finally, the raw embryo is put into a corundum tube furnace and heat-treated at 1600°C under normal pressure in an oxygen flowing atmosphere for 5 hours to undergo a phase change reaction, and then the furnace is cooled to obtain a tetravalent manganese ion activated corundum phase red luminescent ceramic.

[0050] A fluorescence spectrometer was used to test the fluorescence spectrum of the fluorescent material prepared in Example 2 of the present invention under 405 ...

Embodiment 3

[0052] The method for preparing the fluorescent material in Example 3 is basically the same as that in Example 1, except that the heat treatment temperature is 1500°C.

[0053] Similarly, a fluorescence spectrometer was used to test the fluorescence spectrum of the fluorescent material prepared in Example 3 of the present invention under 405 nm ultraviolet light excitation, and the test results are as follows Image 6 As shown, the luminescence center of the prepared ceramic is 678 nm, that is, 678 nm red light is obtained.

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Abstract

The invention provides a Mn4<+> ion activated corundum phase red light-emitting florescent ceramic and a preparation method thereof. The chemical formula is (Al(1-x-y)Mn4<+>xM2<+>y)2O3, wherein M2<+>is Mg2<+>ions or Ca2<+> ions or combination of Mg2<+>ions and Ca2<+> in any proportion. The preparation method of the red light-emitting florescent ceramic comprises the following steps: weighing corresponding raw materials according to a chemical composition of (Al(1-x-y)Mn4<+>xM2<+>y)2O3; uniformly mixing the raw materials by way of a blender mixer, barreling, ball-milling and the like; then carrying out insulating thermal treatment for 0.5-120 h in a 1200-1800 DEG C temperature interval in a pure oxygen atmosphere; and carrying out cooling to obtain the Mn4<+> ion activated corundum phase red light-emitting florescent ceramic. The red light-emitting florescent ceramic prepared by the method emits bright red fluorescence excited by ultraviolet-bluevoilet-blue light. The red light-emitting florescent ceramic has very high heat conductivity, and has the characteristics of being low in cost, good in physical and chemical stability, high in preparation controllability and the like.

Description

Technical field [0001] The invention relates to a preparation method of fluorescent ceramic material, in particular to a Mn 4+ Ion activated corundum phase red luminescent fluorescent ceramics and preparation method thereof. Background technique [0002] Fluorescence conversion type is still a mainstream technology route for current white light LEDs. The current commercial fluorescent conversion type white light LEDs are composed of Ce:YAG yellow phosphors dispersed in silica gel film excited by blue LED chips. However, although Ce:YAG phosphor has high luminous efficiency (internal quantum efficiency of more than 90%), its fluorescence spectrum lacks red light components, resulting in high color temperature and low color rendering index. [0003] In recent years, Mn 4+ Ion-activated red fluorescent materials have attracted much attention from scientific research and industry. They have huge application space in the field of improving the color quality of LED indoor lighting and pl...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622C09K11/64
CPCC04B35/10C04B35/622C04B2235/3206C04B2235/3267C04B2235/9646C09K11/643
Inventor 林辉赵杰冯丹丹
Owner 贵州赛义光电科技有限公司