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Phosphate blue fluorescent powder for white-light LED (Light-Emitting Diode) and preparation method thereof

A blue phosphor, phosphate technology, applied in chemical instruments and methods, luminescent materials, sustainable buildings, etc., can solve the problems of high color temperature, low color rendering index, cannot be used as indoor lighting, etc., and achieve high luminous brightness. , high luminous efficiency, good chemical stability and thermal stability

Inactive Publication Date: 2015-01-21
HANGZHOU DIANZI 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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  • Phosphate blue fluorescent powder for white-light LED (Light-Emitting Diode) and preparation method thereof
  • Phosphate blue fluorescent powder for white-light LED (Light-Emitting Diode) and preparation method thereof
  • Phosphate blue fluorescent powder for white-light LED (Light-Emitting Diode) and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh the raw material CaHPO 4 (5mol), CaCO 3 (2.999mol), La 2 O 3 (1mol) and Eu 2 O 3 (0.0005mol), namely Ca 2+ :La 3+ :PO 4 2- :Eu 2+ The molar ratio is 7.999:2:5:0.001; after the above raw materials are fully ground and mixed uniformly, they are placed in a corundum crucible, and then placed in a high-temperature furnace in a CO atmosphere at 1350°C for 7 hours, and then cooled to room temperature to obtain phosphate Blue phosphor Ca 7.999 La 2 (PO 4 ) 5 O 2 :0.001Eu 2+ .

[0028] From figure 1 It can be seen that the excitation spectrum of the phosphor of this embodiment is a broad spectrum, covering the ultraviolet and violet light regions, the excitation peak is located near 360nm, and the spectral peak is high, indicating that the phosphor of this embodiment can be effectively excited by the ultraviolet and violet chips. . When the excitation wavelength of the emission spectrum is 360nm, from figure 2 It can be seen that the emission of the phosphor of this embodim...

Embodiment 2

[0030] Weigh the raw material CaHPO 4 (5mol), CaCO 3 (2.995mol), La 2 O 3 (1mol) and Eu 2 O 3 (0.0025mol), namely Ca 2+ :La 3+ :PO 4 2- :Eu 2+ The molar ratio is 7.995:2:5:0.005; after the above raw materials are fully ground and mixed uniformly, they are placed in a corundum crucible, and then placed in a high-temperature furnace in a CO atmosphere at 1350°C for 3 hours, and then cooled to room temperature to obtain phosphate Blue phosphor Ca 7.995 La 2 (PO 4 ) 5 O 2 :0.005Eu 2+ .

[0031] The excitation spectrum of the phosphor of this embodiment is a broad spectrum, covering the ultraviolet and violet light regions, the excitation peak is located near 360 nm, and the spectral peak is high, indicating that the phosphor of this embodiment can be effectively excited by the ultraviolet and violet chips. When the excitation wavelength of the emission spectrum is 360nm, from Figure 4 It can be seen that the emission of the phosphor of this embodiment is broadband blue emission of di...

Embodiment 3

[0033] Weigh the raw material NH 4 H 2 PO 4 (5mol), CaCO 3 (7.99mol), La 2 O 3 (1mol) and Eu 2 O 3 (0.005mol), namely Ca 2+ :La 3+ :PO 4 2- :Eu 2+ The molar ratio is 7.99:2:5:0.01; after the above raw materials are fully ground and mixed uniformly, they are placed in a corundum crucible, and then placed in a high-temperature furnace in a CO atmosphere at 1250°C for 7 hours, and then cooled to room temperature to obtain phosphate Blue phosphor Ca 7.99 La 2 (PO 4 ) 5 O 2 :0.01Eu 2+ .

[0034] The excitation spectrum of the phosphor of this embodiment is a broad spectrum, covering the ultraviolet and violet light regions, the excitation peak is located near 360 nm, and the spectral peak is high, indicating that the phosphor of this embodiment can be effectively excited by the ultraviolet and violet chips. When the excitation wavelength of the emission spectrum is 360nm, from Figure 5 It can be seen that the emission of the phosphor of this embodiment is broadband blue emission of di...

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Abstract

The invention discloses phosphate blue fluorescent powder for white-light LED (Light-Emitting Diode) and a preparation method for the phosphate blue fluorescent powder. The fluorescent powder is shown in a chemical expression of Ca8-xLa2(PO4)5O2:xEU<2+>; x is between 0.001 and 0.10. A method comprises the following steps: weighing calcium carbonate, calcium hydrophosphate or ammonium dihydrogen phosphate, lanthanum oxide and europium oxide which are used as raw materials according to the chemical metering ratio of Ca8-xLa2(PO4)5O2:xEU<2+>; grinding the raw materials and uniformly mixing; putting the mixture into a crucible; putting the crucible into a high-temperature furnace, sintering at the temperature of 1,250-1,350 DEG C for 3-7 hours under the condition of reducing atmosphere, and cooling to room temperature, so as to obtain the fluorescent powder. The blue fluorescent powder emits the blue light under the excitation of an ultraviolet and purple light chip, and the emission peak value approaches to 450nm. The fluorescent powder is high in dispersibility, uniform in granularity, high in chemical stability and high in luminous efficiency; an excitation band covers an ultraviolet and purple light area, so that the fluorescent powder can be used as blue fluorescent powder for a near ultraviolet LED.

Description

Technical field [0001] The invention relates to the technical field of rare earth luminescent materials, in particular to a phosphate blue phosphor for white light LEDs and a preparation method thereof. Background technique [0002] White light 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. It is regarded as the next to incandescent lamp. The fourth generation of lighting sources after fluorescent lamps and high-pressure gas discharge lamps are mainstream products in the future lighting market. [0003] At present, there are various methods for preparing white light LEDs. Among them, blue LED chips are combined with yellow fluorescent materials, blue LED chips are combined with red and green fluorescent materials, and purple LED chips are combined with three-primary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/81
CPCY02B20/00
Inventor 余华季振国陈大钦陈雷锋钟家松赵红挺
Owner HANGZHOU DIANZI UNIV