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Halophosphate blue phosphor powder for white light LED and preparation method of halophosphate blue phosphor powder

A technology of blue fluorescent powder and halophosphate, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of high color temperature, low color rendering index, and inability to be used as indoor lighting, and achieve high luminous brightness and luminous efficiency High, good chemical stability and thermal stability

Inactive Publication Date: 2015-09-23
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The combination of blue LED chips and yellow fluorescent materials is the earliest and most mature method of research. The luminous efficiency of the prepared white LED has far exceeded that of incandescent lamps, but the color rendering index is low and the color temperature is high, so it cannot be used as indoor lighting.

Method used

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  • Halophosphate blue phosphor powder for white light LED and preparation method of halophosphate blue phosphor powder
  • Halophosphate blue phosphor powder for white light LED and preparation method of halophosphate blue phosphor powder
  • Halophosphate blue phosphor powder for white light LED and preparation method of halophosphate blue phosphor powder

Examples

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Effect test

Embodiment 1

[0020] A kind of halophosphate blue fluorescent powder for white light LED, according to Na 2 Ba 5.995 Gd 2 (PO 4 ) 6 Cl 2 : 0.005Eu 2+ Weigh NaCl, BaCO 3 、Gd 2 o 3 , NH 3 h 2 PO 4 and Eu 2 o 3 , the molar ratio between them is 2:5.995:1:6:0.0025. After fully grinding and mixing, place it in a corundum crucible, then put it into a high-temperature furnace and bake it at 1150°C for 3 hours in a CO atmosphere, and then cool it to room temperature. , to obtain halophosphate blue phosphors.

[0021] From figure 1 It can be seen from the figure that the excitation spectrum of the phosphor powder in this embodiment is a broad spectrum, covering the ultraviolet, purple and blue light regions, and the excitation peak is located near 370nm, indicating that the phosphor powder in this embodiment can be effectively excited by blue light or purple light chips. When the excitation wavelength of the emission spectrum is 370nm, from figure 2 It can be seen from the figure th...

Embodiment 2

[0023] A kind of halophosphate blue fluorescent powder for white light LED, according to Na 2 Ba 5.999 Gd 2 (PO 4 ) 6 Cl 2 : 0.001Eu 2+ , weigh NaCl, BaCO 3 、Gd 2 o 3 , NH 3 h 2 PO 4 and Eu 2 o 3 , the molar ratio between them is 2:5.999:1:6:0.0005. After fully grinding and mixing, place it in a corundum crucible, then put it into a high-temperature furnace and bake it at 1250°C for 7 hours in a CO atmosphere, and then cool it to room temperature. , to obtain halophosphate blue phosphors.

[0024] The excitation spectrum of the phosphor powder in this embodiment is a broad spectrum, covering the ultraviolet, violet and blue light regions, and the excitation peak is located near 370nm, indicating that the phosphor powder in this embodiment can be effectively excited by blue light or purple light chips. When the excitation wavelength of the emission spectrum is 370nm, the emission of the fluorescent powder in this implementation is the broadband blue light emission...

Embodiment 3

[0026]A kind of halophosphate blue fluorescent powder for white light LED, according to Na 2 Ba 5.99 Gd 2 (PO 4 ) 6 Cl 2 : 0.01Eu 2+ Weigh NaCl, BaCO 3 、Gd 2 o 3 , NH 3 h 2 PO 4 and Eu 2 o 3 , the molar ratio between them is 2:5.99:1:6:0.005. After fully grinding and mixing, place it in a corundum crucible, then put it in a high-temperature furnace and bake it at 1150°C for 7 hours in a CO atmosphere, and then cool it to room temperature. , to obtain halophosphate blue phosphors.

[0027] The excitation spectrum of the phosphor powder in this embodiment is a broad spectrum, covering the ultraviolet, violet and blue light regions, and the excitation peak is located near 370nm, indicating that the phosphor powder of this embodiment can be effectively excited by blue light or purple light chips. When the excitation wavelength of the emission spectrum is 370nm, the emission of the fluorescent powder in this implementation is the broadband blue light emission of dival...

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Abstract

The invention discloses a halophosphate blue phosphor powder for a white light LED and a preparation method of the halophosphate blue phosphor powder. The chemical formula of the phosphor powder is Na2Ba[6-x]Gd2(PO4)6Cl2:xEu<2+>, wherein the x is equal to 0.001-0.1. The preparation method comprises the following steps: weighing corresponding raw materials of sodium chloride, barium carbonate, gadolinium oxide, ammonium dihydrogen phosphate and europium oxide according to the stoichiometric ratio of the chemical formula, then grinding and uniformly mixing the raw materials to obtain a mixture, filling the mixture into a crucible, sintering in a high temperature furnace under the condition of reducing atmosphere at 1150-1250 DEG C for 3-7 hours, and cooling to the room temperature to obtain the halophosphate blue phosphor powder. The obtained blue phosphor powder emits blue lights under the excitation of ultraviolet and a violet ray chip, and the emitting peak value is positioned around 480 nm. The phosphor powder is good in dispersivity, uniform in granularity, good in chemical stability and high in luminous efficiency, the excitation band of the phosphor powder covers the ultraviolet and the violet ray area, and the blue phosphor powder is suitable for ultraviolet LEDs.

Description

technical field [0001] The invention relates to the technical field of rare earth luminescent materials, in particular to a halophosphate blue fluorescent powder for white LEDs and a manufacturing method thereof. Background technique [0002] White LED is a solid-state semiconductor device that converts electrical energy into white light, also known as semiconductor lighting. It has many advantages such as high efficiency, small size, long life, safety, low voltage, energy saving, and environmental protection. , Fluorescent lamps, and high-pressure gas discharge lamps are the fourth generation of lighting sources, which will be the mainstream products in the future lighting market. [0003] At present, there are various white light LED preparation methods, among which the combination of blue LED chips and yellow fluorescent materials, the combination of blue LED chips and red and color fluorescent materials, and the combination of purple LED chips and three primary color flu...

Claims

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Application Information

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IPC IPC(8): C09K11/86
Inventor 邓德刚戴剑黄君徐时清王焕平华有杰黄立辉李晨霞
Owner CHINA JILIANG UNIV
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