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Novel silicon-nitrogen compound luminescent material and preparation method thereof

A silicon nitride compound and luminescent material technology, applied in the field of materials, can solve problems such as low effective conversion efficiency, narrow emission spectrum, and unstable properties, and achieve the effects of low raw material cost, good anti-attenuation characteristics, and wide excitation range

Pending Publication Date: 2020-06-02
XIA MEN KE YU PHOTOELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technology of using blue LEDs with fluorescent powder to produce white light is relatively mature, but due to the high brightness of blue light chips, excessive blue light content in LED lights will easily lead to fatigue, and there is a phenomenon that it is not up to standard in the field of educational lighting. Now the imitation solar spectrum Violet light chips are used in LED lamps, but the existing YAG aluminate and silicate products are excited by violet light chips, which have low effective conversion efficiency, narrow emission spectrum, low color rendering, or unstable properties and large light attenuation. And other issues

Method used

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  • Novel silicon-nitrogen compound luminescent material and preparation method thereof
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Ba 1.96 GaSi 3 o 2 N 5 :0.04Eu 2+ Preparation example of luminescent material

[0036] Press Ba 1.96 GaSi 3 o 2 N 5 :0.04Eu 2+ The stoichiometric ratio weighs barium nitride, gallium nitride, silicon nitride, silicon dioxide and europium oxide and mixes them in a glove box. Put the mixed solid raw materials into a tungsten crucible and put them into a graphite furnace at 1700 degrees. Under the pressure of 1mpa, the burning reaction was carried out in a nitrogen atmosphere for 10h. After the sintered product is cooled, it is pulverized, impurity removed, dried and sieved to obtain the silicon nitride compound luminescent material.

[0037] Use a fluorescence spectrometer to detect the luminous intensity and luminous spectrum of the product, use a scanning electron microscope to detect the shape of the product, and use an SSP6612 LED photochromic and electrical parameter comprehensive instrument to test the spectral characteristics of the phosphor po...

Embodiment 2

[0038] Example 2: Ba 1.96 al 0.2 Ga 0.8 Si 3 o 2 N 5 :0.04Eu 2+ Preparation example of luminescent material

[0039] Press Ba 1.96 al 0.2 Ga 0.8 Si 3 o 2 N 5 :0.04Eu 2+ The stoichiometric ratio of barium nitride, aluminum nitride, gallium nitride, silicon nitride, silicon dioxide and europium oxide was mixed in a glove box, and the mixed solid raw materials were put into a tungsten crucible and placed in a graphite furnace , 1720 degrees, under the pressure of 1mpa, burning reaction in nitrogen atmosphere for 8h. After the sintered product is cooled, it is pulverized, impurity removed, dried and sieved to obtain the silicon nitride compound luminescent material. figure 1 The excitation spectrum of Example 2 when the emission wavelength is 520 nm and the emission spectrum when the excitation wavelength is 460 nm are shown.

Embodiment 3

[0040] Example 3: Ca 1.95 AlSi 3 o 2 N 5 :0.05Eu 2+ Preparation example of luminescent material

[0041] Press Ca 1.95 AlSi 3 o 2 N 5 :0.05Eu 2+ The stoichiometric ratio weighs calcium nitride, aluminum nitride, silicon nitride, silicon dioxide and europium oxide and mixes them in a glove box. Put the mixed solid raw materials into a tungsten crucible and put them into a graphite furnace at 1730 degrees. Under the pressure of 2mpa, the burning reaction was carried out in nitrogen atmosphere for 12h. After the sintered product is cooled, it is pulverized, impurity removed, dried and sieved to obtain the silicon nitride compound luminescent material. figure 1 The excitation spectrum of Example 3 when the emission wavelength is 550 nm and the emission spectrum when the excitation wavelength is 410 nm are shown.

[0042] Figure 4 and Figure 5 It can be seen from the comparison that the intensity of each peak is relatively high and balanced in the spectrum after the ...

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Abstract

The invention relates to the technical field of materials, in particular to a novel silicon-nitrogen compound luminescent material and a preparation method thereof. The luminescent material is excitedby a purple light chip after being matched with nitride red LED fluorescent powder, and an emission spectrogram with the color rendering index close to 98 can be obtained, wherein the emission spectrogram can reduce blue light intensity to product human eyes. The chemical formula of the compound of the luminescent material is M2-xAlyGa1-ySi3OzN5:xEu, wherein M is at least one or more of II-groupalkaline earth metal elements Ca, Sr, Ba and Mg, x is greater than or equal to 0.001 and less than or equal to 0.5, y is greater than or equal to 0 and less than or equal to 1, and z is greater than or equal to 0 and less than or equal to 5. The luminescent material disclosed by the invention has the characteristics that the emission spectrogram is mainly within 360-460nm, the emission wavelengthof the luminescent material is 470-570nm, the luminescent efficiency is high, the stability is high, the color rendering index is high after the luminescent material is excited by the purple light chip in cooperation with red fluorescent powder, the blue light intensity is low, the spectral curve is soft and the like.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a novel silicon-nitride compound luminescent material and a preparation method thereof. Background technique [0002] White light LED has attracted much attention because of its energy saving, high efficiency, long life and environmental protection, which is called a new generation of solid-state lighting. [0003] U.S. Patent US8427041 reported: a kind of xLu 3 al 5 o 12 ,yGd 3 al 5 o 12 : CePrEuTb structure phosphor powder can be excited by 420-500nm light, and white light can be obtained after packaging with the corresponding chip, but this product has the problem of low conversion efficiency and is difficult to be excited by the purple light chip. [0004] Patent application CN105247011A discloses an α-Sialon-based fluorescent powder with an emission band of 565-577nm. The fluorescent powder can be excited by a 450nm blue light chip, and the quantum efficiency after e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
CPCC09K11/7734C09K11/0883
Inventor 唐勇李辉李少娟
Owner XIA MEN KE YU PHOTOELECTRIC CO LTD
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