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Lanthanum molybdate-doped terbium fluorescent powder for nanometer hollow LED and preparation method thereof

A technology of lanthanum molybdate and fluorescent powder, which is applied in chemical instruments and methods, luminescent materials, semiconductor devices, etc., can solve the problems of high raw material cost of narrow-band green fluorescent powder, reduced luminous efficiency, waste of rare earth resources, etc., and achieves the convenience of mass production The effect of preparation, good dispersion and low cost

Active Publication Date: 2022-03-08
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the crushing process, defects are generated on the surface of the particles, which become the luminescence quenching center and reduce the luminous efficiency
In addition, the phosphor powder prepared by the solid-state reaction method has a solid structure, and the excitation light from the outside does not enter, and the rare earth ions inside cannot be stimulated to emit light, resulting in a waste of rare earth resources.
[0004] In the prior art, there is still a lack of a low-cost phosphor that can produce narrow-band green light emission. Therefore, it is urgent to develop a phosphor that can produce narrow-band green light emission with low raw material cost, relatively easy synthesis, and stable chemical properties. Solve the problems of high raw material cost, relatively difficult synthesis, or poor stability of narrow-band green phosphors in the prior art, which is of great significance to the fields of lighting and display

Method used

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  • Lanthanum molybdate-doped terbium fluorescent powder for nanometer hollow LED and preparation method thereof
  • Lanthanum molybdate-doped terbium fluorescent powder for nanometer hollow LED and preparation method thereof
  • Lanthanum molybdate-doped terbium fluorescent powder for nanometer hollow LED and preparation method thereof

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Embodiment 1

[0032] Lanthanum molybdate-doped terbium phosphor for nanometer hollow LED of the present invention, the chemical composition general formula is: La 2(1-x) Tb 2x Mo 3 o 12 , where x=7.0 mol%. Its preparation method comprises the following steps:

[0033] (1) Separately dissolve La with nitric acid 2 o 3 and Tb 2 o 3 , heated to volatilize excess nitric acid, and then added an appropriate amount of distilled water to configure 0.4mol / L La(NO 3 ) 3 solution and 0.2mol / L Tb(NO 3 ) 3 solution.

[0034] (2) Weigh 3.12g of glucose, dissolve it in 40mL of distilled water to obtain an aqueous solution of glucose, transfer it to the reactor, and the volume filling degree of the reactor is 80%, put it into an oven for hydrothermal reaction, and the reaction temperature is 180°C. The time is 6 hours; after the reaction is completed, it is centrifugally settled, washed once with distilled water and absolute ethanol, and dried at 75° C. for 6 hours to obtain brown-black carbon ...

Embodiment 2

[0040] Lanthanum molybdate-doped terbium phosphor for nanometer hollow LED of the present invention, the chemical composition general formula is: La 2(1-x) Tb 2x Mo 3 o 12 , where x=5.0 mol%. Its preparation method comprises the following steps:

[0041] (1) Separately dissolve La with nitric acid 2 o 3 and Tb 2 o 3 , heated to volatilize excess nitric acid, and then added an appropriate amount of distilled water to configure 0.4mol / L La(NO 3 ) 3 solution and 0.2mol / L Tb(NO 3 ) 3 solution.

[0042] (2) Weigh 2.5g of glucose, dissolve it in 35mL of distilled water to obtain an aqueous solution of glucose, transfer it to the reactor, and the volume filling degree of the reactor is 75%, put it into an oven for hydrothermal reaction, and the reaction temperature is 160°C. The time is 8 hours; after the reaction is completed, it is centrifugally settled, washed twice with distilled water and absolute ethanol, and dried at 80° C. for 4 hours to obtain brown-black carbon ...

Embodiment 3

[0048] Lanthanum molybdate-doped terbium phosphor for nanometer hollow LED of the present invention, the chemical composition general formula is: La 2(1-x) Tb 2x Mo 3 o 12 , where x=15.0 mol%. Its preparation method comprises the following steps:

[0049] (1) Separately dissolve La with nitric acid 2 o 3 and Tb 2 o 3 , heated to volatilize excess nitric acid, and then added an appropriate amount of distilled water to configure 0.4mol / L La(NO 3 ) 3 solution and 0.2mol / L Tb(NO 3 ) 3 solution.

[0050] (2) Weigh 2.0 g of glucose, dissolve it in 35 mL of distilled water to obtain an aqueous solution of glucose, transfer it to the reactor, and the volume filling degree of the reactor is 70%, put it into an oven for hydrothermal reaction, and the reaction temperature is 160 ° C. The time is 8 hours; after the reaction is completed, it is centrifugally settled, washed twice with distilled water and absolute ethanol, and dried at 75°C for 6 hours to obtain brown-black carb...

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Abstract

The invention provides a kind of lanthanum molybdate-doped terbium fluorescent powder for nanometer hollow LED and its preparation method, and its chemical composition expression is: La 2(1‑x) Tb 2x Mo 3 o 12 , wherein x=0.5~15.0mol%. The lanthanum molybdate-doped terbium phosphor powder for nano-hollow LEDs prepared by the present invention has good crystallinity, uniform particle size, good dispersibility, and nano-hollow structure, which can effectively save rare earth resources, reduce costs, and do not need to be used twice. Pulverized; the lanthanum molybdate-doped terbium fluorescent powder for nano hollow LEDs obtained in the present invention can be effectively excited by near-ultraviolet light, the highest emission peak is 545nm, the half-height width ~ 8nm, is a narrow-band green light emission, and solves the problem of green fluorescent powder for LED display. There are problems in the emission bandwidth; the method has abundant sources of raw materials, low cost, simple synthesis process, easy operation, good repeatability, and can be prepared in large quantities.

Description

technical field [0001] The invention relates to the technical field of preparation of luminescent materials, in particular to a lanthanum molybdate-doped terbium phosphor for nano hollow LEDs and a preparation method thereof. Background technique [0002] White light LEDs have many advantages such as high luminous efficiency, energy saving, long life, small size, safety and environmental protection, and are widely used in lighting, backlight, traffic signals, automobiles, etc. In order to obtain a more realistic display image, when white LEDs are used in liquid crystal backlights, red and green phosphors with narrow-band emission need to be used. Among them, the choice of green phosphor is particularly important, because its emission spectrum is between the blue and red emission spectra, and has the most obvious impact on the brightness and color gamut of white LED color rendering devices. Currently, the green phosphors used in white LEDs include materials such as silicates...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/7776H01L33/502
Inventor 谢颖缪菊红姚乐琪李林珂张祎于皓
Owner NANJING UNIV OF INFORMATION SCI & TECH