CaMg<2>Al<16>O<27>:Mn <4+> red fluorescent powder and preparation technology thereof

A camg2al16-xo27, red phosphor technology, applied in the field of solid luminescent materials, can solve the problems of unstable physical and chemical properties of red phosphors, harsh preparation conditions, expensive raw materials, etc., and achieves low cost, simple preparation process, and cheap raw materials. Effect

Inactive Publication Date: 2015-04-22
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problem of unstable physical and chemical properties of the red phosphor existing in the prior art and high cost due to harsh preparation conditions and expensive raw materials

Method used

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  • CaMg&lt;2&gt;Al&lt;16&gt;O&lt;27&gt;:Mn &lt;4+&gt; red fluorescent powder and preparation technology thereof
  • CaMg&lt;2&gt;Al&lt;16&gt;O&lt;27&gt;:Mn &lt;4+&gt; red fluorescent powder and preparation technology thereof
  • CaMg&lt;2&gt;Al&lt;16&gt;O&lt;27&gt;:Mn &lt;4+&gt; red fluorescent powder and preparation technology thereof

Examples

Experimental program
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example 1

[0022] Example 1: Analytical pure CaCO 3 、Al 2 o 3 , MgO, and MnCO 3 Powder, as CaCO 3 :2MgO:7.96Al 2 o 3 :0.08MnCO 3 The ratio of (molar ratio) is accurately weighed and placed in an agate mortar, and an appropriate amount of ethanol is added to grind for 30 minutes to make it evenly mixed; then placed in a 60°C oven for about 3-5 minutes, after taking it out, put it in the grinder Continue to grind in the bowl for 15 minutes, then place it in a square crucible, heat it to 1550°C in a high-temperature program-controlled high-temperature box-type resistance furnace, keep it warm for 4 hours, and cool down with the furnace to obtain a sample. Grinding and sieving to obtain phosphor powder, the color of the phosphor powder observed is light pink. According to the scanning electron microscope observation, it can be seen that the prepared powder sample has a size of 20 microns, such as figure 1 Shown; X-ray diffraction analysis result, the fluorescent powder that obtains i...

example 2

[0023] Example 2: Analytical pure CaCO 3 、Al 2 o 3 , MgO, and MnCO 3 Powder, as CaCO 3 :2MgO:7.992Al 2 o 3 :0.016MnCO 3 The ratio of (molar ratio) is accurately weighed and placed in an agate mortar. Add an appropriate amount of ethanol and grind for 20 minutes to make it evenly mixed; then place it in a 60°C oven for about 2 minutes, take it out, and place Grind in medium for 1 hour, then bake in an oven at 60°C for 10 minutes, take it out and grind for 10 minutes, then put it in a square crucible, heat it to 1450°C in a high-temperature box furnace with program temperature control, keep it for 6 hours, Cool to obtain the sample. Grinding and sieving to obtain phosphor powder, the color of the phosphor powder observed is light pink. According to the results of X-ray diffraction analysis, the phosphor powder obtained is a pure phase of CMA; its excitation and emission spectra at room temperature were measured with a FLS920 fluorescence spectrometer, and it was found th...

example 3

[0024] Example 3: Analytical pure CaCO 3 、Al 2 o 3 , MgO, and MnCO 3 Powder, as CaCO 3 :2MgO:7.76Al 2 o 3 :0.48MnCO 3 The ratio (molar ratio) is accurately weighed and placed in an agate mortar, and an appropriate amount of ethanol is added to grind for 20 minutes to make it evenly mixed; then placed in a 60°C oven for about 3-5 minutes, after taking it out, put it in the grinder Continue to grind in the bowl for 45 minutes, then place it in a square crucible, heat it to 1500°C in a high-temperature program-controlled high-temperature box-type resistance furnace, keep it warm for 2 hours, and cool it with the furnace to obtain a sample. Grinding and passing through a mesh sieve to obtain phosphor powder, the color of the phosphor powder observed is dark red. According to the results of X-ray diffraction analysis, the phosphor powder obtained is a pure phase of CMA; its excitation and emission spectra at room temperature were measured with a FLS920 fluorescence spectrome...

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Abstract

The invention relates to red light emission fluorescent powder which can be produced under excitation of ultraviolet/blue light. A chemical expression formula of the material is xMn<4+>: CaMg<2>Al<16>O<27> (x is more than or equal to 0.016 and less than or equal to 0.48). The invention also provides a preparation method of the red fluorescent powder. The red fluorescent powder is high in stability, and can be effectively excited by 250-500 nanometers of ultraviolet/blue light so as to produce 620-700 nanometers of red light emission so that the fluorescence quantum efficiency reaches 47.2 percent. The fluorescent powder can be used for building warm white LED excited by an ultraviolet/blue light chip.

Description

technical field [0001] The invention relates to the field of solid luminescent materials, in particular to a manganese (IV)-doped red fluorescent powder that can be used for warm white LEDs and a preparation method thereof. technical background [0002] White light LED has significant advantages such as high light efficiency, long life, energy saving and environmental protection, and has broad application prospects in the fields of green lighting and information display lights. At present, the mainstream method of white light LEDs on the market is to use garnet-structured yttrium aluminate yellow phosphor (Ce:YAG) activated by rare earth cerium with blue LED chips, and its luminous lumen efficiency has exceeded 200lm / W. However, the red light component in the emission spectrum of Ce:YAG phosphor is insufficient, and the human eye feels too cold and poor in color rendering when lighting. Therefore, in order to meet the needs of indoor lighting, it is often necessary to add an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64H01L33/50
CPCY02B20/00
Inventor 王波林航王元生
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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