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Fluorescent powder for white LED (light emitting diode) for illumination display as well as preparation method and application thereof

A phosphor and display technology, applied in the field of red phosphors, 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: 2019-09-27
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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  • Fluorescent powder for white LED (light emitting diode) for illumination display as well as preparation method and application thereof
  • Fluorescent powder for white LED (light emitting diode) for illumination display as well as preparation method and application thereof
  • Fluorescent powder for white LED (light emitting diode) for illumination display as well as preparation method and application thereof

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 Sr was weighed separately 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, then weigh the co-solvent Li 3 N and impurity-removing reagent carbon powder are mixed with the raw materials to form a mixture, and the mass fraction of the co-solvent and the impurity-removing reagent in the mixture is 1wt%. After fully grinding and mixing evenly, put it in a boron nitride crucible, put it into a high-temperature tube furnace and burn it at 1500°C for 4 hours under a nitrogen atmosphere, cool to room temperature with the furnace, grind, and sieve to make a lighting display White LEDs use red phosphors.

[0032] figure 1 It is the XRD collection of illustrative plates and standard collection of collections (ICSD: 401500) of the phosphor powder prepared in embodiment 1, fr...

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 Sr was weighed separately 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 impurity-removing reagent carbon powder are mixed with the raw materials taken to form a mixture. The mass fraction of the co-solvent and the impurity-removing reagent in the mixture is 1wt%; Put it into a high-temperature tube furnace and burn it at 1500° C. for 4 hours under a nitrogen atmosphere, and cool to room temperature with the furnace to obtain a red fluorescent powder for white LEDs for lighting and display.

[0043] Figure 9 Be the XRD collection of illustrative plates and the standard collection of collections (ICSD: 401500) of the phosphor powder prepared in embodiment 2, from Figure 9 It can be seen that the fluorescent powder XRD s...

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 Sr was weighed separately 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 impurity-removing reagent carbon powder 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 is 1wt%. After fully grinding and mixing evenly, put it in a boron nitride crucible, put it into a high-temperature tube furnace and burn it at 1500°C for 4 hours under a nitrogen atmosphere, and then cool it to room temperature to obtain a red phosphor powder for white LEDs.

[0047] Figure 11 It is the XRD collection of illustrative plates and the standard collection of collections (ICSD: 401500) of the fluorescent powder that embodiment 3 prepares, from Figure ...

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Abstract

The invention discloses fluorescent powder for a white LED (light emitting diode) for illumination display as well as a preparation method and application thereof. The chemical general formula of the fluorescent powder is (Sr1-yCay)2-xSi5-zAlzN8-zOz:xEu<2+>. The preparation method comprises the following steps of weighing the raw materials according to the stoichiometric ratio of the chemical general formula and then weighing a cosolvent and an impurity removal reagent; carrying out mixing and grinding; and putting all the raw materials into a boron nitride crucible, carrying out high temperature heat preservation in a protective atmosphere, carrying out cooling to reach room temperature, grinding a sintered product and carrying out sieving so as to obtain the fluorescent powder for the white LED (light emitting diode) for illumination display. The fluorescent powder is used in various illumination display devices with near ultraviolet light as an excitation source. The fluorescent powder solves the problems that in the prior art, when a near-ultraviolet chip excites trichromatic fluorescent powder to form white light, reabsorption is caused, and the light conversion and energy conversion efficiency is low due to reabsorption, the light emitting uniformity is poor, and the color rendering property is poor due to the deficiency of red light. The fluorescent powder is suitable for the various illumination display devices with the 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 and display, 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 light LED has the advantages of long life, high energy saving and environmental protection. It is the fourth generation of new lighting and display light source 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 and red phosphors is partially used. In white LED display, ...

Claims

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Application Information

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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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