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Red phosphor powder for white LED as well as preparation method and application thereof

A technology of red fluorescent powder and fluorescent powder, which is applied in chemical instruments and methods, luminescent materials, and the use of gas discharge lamps. It can solve the problems of easy decomposition, unstable chemical properties, and low luminous efficiency, and achieve stable physical and chemical properties. , Wide range of excitation wavelengths, good application prospects

Inactive Publication Date: 2011-03-23
启东晟涵医疗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Example: someone tries to convert Y 2 o 2 S:Eu 3+ Applied in the WLED field, however, the current commercial red phosphor Y 2 o 2 S:Eu 3+ There are many disadvantages: low luminous efficiency under near-ultraviolet excitation, unstable chemical properties, easy to decompose, short life, and the precipitation of sulfur will cause corrosive effects on the chip, resulting in the failure of the entire device
[0006] Currently about Eu 3+ In order to activate ions, there are few literature reports and patents on niobate-based red phosphors for white LEDs

Method used

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  • Red phosphor powder for white LED as well as preparation method and application thereof
  • Red phosphor powder for white LED as well as preparation method and application thereof
  • Red phosphor powder for white LED as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: LiGd 0.80 Nb 2 o 7 : 0.20 Eu 3+ Preparation example of phosphor powder.

[0038] Weigh 0.3688 g Li respectively 2 CO 3 (analytical pure), 1.4474 g Gd 2 o 3 (99.999%), 2.6533 g Nb 2 o 5 (99.999%), 0.3513 g Eu 2 o 3 (99.999%), grind and mix evenly in an agate mortar, put it into an alumina crucible, bake at 1200 ° C for 5 hours, cool to room temperature with the furnace, and grind to obtain LiGd in the present invention. 0.80 Nb 2 o 7 : 0.20 Eu 3+ red phosphor. Its excitation and emission spectra are shown in figure 1 .

Embodiment 2

[0039] Example 2: NaGd 0.80 Nb 2 o 7 : 0.20 Eu 3+ Preparation example of phosphor powder.

[0040] Weigh 0.5126 g of Na respectively 2 CO 3 (analytical pure), 1.4024 g Gd 2 o 3 (99.999%), 2.5709 g Nb 2 o 5 (99.999%), 0.3404 g Eu 2 o 3 (99.999%), ground and mixed evenly in an agate mortar, put it into an alumina crucible, baked at 1200°C for 5 hours, cooled to room temperature with the furnace, and ground to obtain NaGd in the present invention. 0.80 Nb 2 o 7 : 0.20 Eu 3+ red phosphor. Its excitation and emission spectra are shown in figure 2 .

Embodiment 3

[0041] Example 3: KGd 0.80 Nb 2 o 7 : 0.20 Eu 3+ Preparation example of phosphor powder.

[0042] Weigh 0.6482 g of K 2 CO 3 (analytical pure), 1.3600 g Gd 2 o 3 (99.999%), 2.4932 g Nb 2 o 5 (99.999%), 0.3301 g Eu 2 o 3 (99.999%), ground and mixed evenly in an agate mortar, put it into an alumina crucible, baked at 1200°C for 5 hours, cooled to room temperature with the furnace, and ground to obtain KGd in the present invention. 0.80 Nb 2 o 7 : 0.20 Eu 3+ red phosphor. Its excitation and emission spectra are shown in image 3 .

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Abstract

The invention relates to red phosphor powder for an LED, having a general chemical composition formula of ALn1-xNb2O7: xEu3+, wherein A comprises one or more than two of Li, Na, K or Rb, Ln comprises one or two of Gd or Y, and x is not smaller than 0.10 and is not larger than 1.00. The preparation method of the red phosphor powder for the white LED comprises the following steps of: (1) weighting,grinding and evenly mixing the raw materials according to the mol ratio of the ALn1-xNb2O7: xEu3+; (2) putting a mixture in the step (1) in air atmosphere of a muffle furnace to roast at 1000-1600 DEG C for 3-15h; and (3) post-treating the roasted product obtained in the step (2). The phosphor powder of the invention can be effectively excited by near-ultraviolet light and blue light to emit red light, can be favorably matched with near-ultraviolet light and blue light LED chips, has stable physical and chemical properties, avoids reactions with oxygen, water, carbon dioxide, and the like in environment and resists heat without toxicity or pollution nuisance. The preparation method is simple and easy to operate for directly roasting in air and has favorable application prospects.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and in particular relates to a red fluorescent powder for white LEDs and a preparation method and application thereof. Background technique [0002] Light-emitting diode (light-emitting diode) is a new type of solid-state lighting electric light source, which has the advantages of high efficiency and energy saving, green environmental protection, long life, small size, impact resistance, fast luminous response and low working voltage. And other fields have already been widely used, and now white light LED has begun to launch a strong challenge to the stable position of incandescent lamps and fluorescent lamps in the lighting field, and is expected to gradually replace them, thus presenting a huge market prospect. [0003] There are two main ways for white LEDs to produce white light: the first is to combine red, green, and blue LEDs to produce white light; the second is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78C09K11/67H01L33/50
CPCY02B20/181Y02B20/00
Inventor 陈伟凡彭久红柯于胜胡建东辜子英
Owner 启东晟涵医疗科技有限公司
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