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A kind of fluorescent powder for white light LED for lighting display and its preparation and application

A technology of red phosphor powder and LED chip, applied in the field of red phosphor powder, can solve problems such as difficulty in meeting the application requirements of high-performance devices, and achieve the effects of easy industrial production, good thermal stability, and high luminous efficiency

Active Publication Date: 2022-07-29
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This red phosphor is CaAlSiN which has been applied in industry 3 :Eu 2+ , its excitation area is very wide, not only can excite near the ultraviolet to blue light region, but also can be well excited in the green to yellow light region, which is difficult to meet the application requirements of high-performance devices

Method used

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  • A kind of fluorescent powder for white light LED for lighting display and its preparation and application
  • A kind of fluorescent powder for white light LED for lighting display and its preparation and application
  • A kind of fluorescent powder for white light LED for lighting display and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] According to the chemical formula (Sr 0.85 Ca 0.15 ) 1.95 Si 4.7 Al 0.3 N 7.7 O 0.3 :0.05Eu 2+ The stoichiometric ratio of each raw material in the 3 N 2 , Ca 3 N 2 , Si 3 N 4 , AlN, Al 2 O 3 and EuF 3 , AlN and Al 2 O 3 The molar ratio is 1:1, and then weigh the co-solvent Li 3 N and the carbon powder of the impurity-removing reagent are mixed with the taken raw materials to form a mixture, and the mass fraction of the co-solvent and the impurity-removing reagent in the mixture are both 1 wt%. After fully grinding and mixing evenly, put it in a boron nitride crucible, put it in a high-temperature tube furnace, and fire it at 1500 ° C for 4 hours under a nitrogen atmosphere. Use red phosphors for white LEDs.

[0032] figure 1 are the XRD pattern and standard pattern (ICSD: 401500) of the phosphor prepared in Example 1, from figure 1 It can be seen that the XRD pattern of the phosphor prepared in Example 1 is the same as the 2 Si5 N 8 The compariso...

Embodiment 2

[0042] According to the chemical formula (Sr 0.85 Ca 0.15 ) 1.95 Si 4.1 Al 0.9 N 7.1 O 0.9 :0.05Eu 2+ The stoichiometric ratio of each raw material in the 3 N 2 , Ca 3 N 2 , Si 3 N 4 , AlN, Al 2 O 3 and EuF 3 , AlN and Al 2 O 3 The molar ratio is 1:1, and then weigh the co-solvent Li separately. 3 N and impurity-removing reagent carbon powder are mixed with the raw materials to form a mixture, and the mass fraction of co-solvent and impurity-removing reagent in the mixture are both 1 wt%; after fully grinding and mixing, place in a boron nitride crucible, and then put In a high-temperature tubular furnace, it is fired at 1500° C. for 4 hours in a nitrogen atmosphere, and then cooled to room temperature with the furnace to obtain a red phosphor for white light LEDs for lighting display.

[0043] Figure 9 are the XRD pattern and standard pattern (ICSD: 401500) of the phosphor prepared in Example 2, from Figure 9 It can be seen that the XRD pattern of the ph...

Embodiment 3

[0046] According to the chemical formula (Sr 0.70 Ca 0.30 ) 1.95 Si 4.7 Al 0.3 N 7.7 O 0.3 :0.05Eu 2+ The stoichiometric ratio of each raw material in the 3 N 2 , Ca 3 N 2 , Si 3 N 4 , AlN, Al 2 O 3 and EuF 3 , AlN and Al 2 O 3 The molar ratio is 1:1, and then weigh the co-solvent Li separately. 3 N and the carbon powder of the impurity-removing reagent are mixed with the raw materials taken to form a mixture, and the mass fraction of the co-solvent and the impurity-removing reagent in the mixture are both 1 wt%. After fully grinding and mixing evenly, it was placed in a boron nitride crucible, and then placed in a high-temperature tube furnace for firing at 1500°C for 4 hours in a nitrogen atmosphere, and then cooled to room temperature to obtain a red phosphor for white LEDs.

[0047] Figure 11 are the XRD pattern and standard pattern (ICSD: 401500) of the phosphor prepared in Example 3, from Figure 11 It can be seen that the XRD pattern of the phosphor...

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Abstract

The invention discloses a fluorescent powder for a white light LED for lighting display and its preparation and application. The general chemical formula of the phosphor is (Sr 1‑y Ca y ) 2‑x Si 5‑z Al z N 8‑z O z :xEu 2+ . According to the stoichiometric ratio of the general chemical formula, weigh each raw material, and then weigh the co-solvent and impurity-removing reagent; mix and grind; place it in a boron nitride crucible, keep it in a protective atmosphere at high temperature, cool it to room temperature, grind the sintered product, and sieve it , the phosphor powder for white LEDs for illumination display is obtained. The phosphor powder is used in various illumination display devices with near-ultraviolet light as the excitation source. The phosphor solves the problem of reabsorption in the prior art when the near-ultraviolet chip excites three primary color phosphors to form white light, and the low light conversion and energy conversion efficiency, poor uniformity of luminescence, and lack of red light caused by reabsorption. It leads to problems such as poor color rendering, and is suitable for various illumination display devices with near-ultraviolet light as the excitation source.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and relates to a fluorescent powder for white LEDs in lighting displays, which is a red fluorescent powder that can be excited by near-ultraviolet rays; the invention also relates to a preparation method and application of the fluorescent powder. Background technique [0002] White LED has the advantages of long life, high energy saving and environmental protection. It is the fourth generation of new lighting and display light sources developed after fluorescent lamps, incandescent lamps and high-pressure gas discharge lamps. In white LED lighting, the combination of blue LED chip + yellow phosphor + red phosphor is mainly used in industrialization and commercialization. In order to further improve the color rendering effect of white LED lighting, a combination of near-ultraviolet LED chips + blue-green-red phosphors is partially used. In the white light LED display, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/64H01L33/50
CPCC09K11/7734H01L33/502Y02B20/00
Inventor 王育华濑户孝俊李泽彬
Owner LANZHOU UNIVERSITY
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