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Phosphate red fluorescent powder for light-emitting diode and preparation method thereof

A technology of light-emitting diodes and red phosphors, applied in the field of materials, can solve the uninvolved and other problems, and achieve the effects of easy operation, simple preparation method and good color purity

Inactive Publication Date: 2011-01-12
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

虽然之前国内有关于LED用红色荧光粉的专利申请,如中国发明专利200510112942.X、200610036399.4、200710055669.0、200710142956.5、200810011406.4、200810218742.6、200910021426.4、200910272541.9、201010300872.1等,但均未涉及本发明所提供的以磷酸 Salt-based AB activated by trivalent europium 1-x PO 4 : x Eu 3+ or A 1+y B 1-x-y PO 4 : x Eu 3+ (A is alkali metal ion; B is alkaline earth metal ion) type phosphor

Method used

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  • Phosphate red fluorescent powder for light-emitting diode and preparation method thereof
  • Phosphate red fluorescent powder for light-emitting diode and preparation method thereof
  • Phosphate red fluorescent powder for light-emitting diode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Raw material is CaCO 3 (analytical pure), NaHCO 3 (analytical pure), (NH 4 ) 2 HPO 4 (analytical pure) and Eu 2 o 3 (99.99%), the molar ratio between them is 0.95:1:1:0.025, the raw materials are accurately weighed and mixed and ground evenly, placed in a crucible, placed in a high-temperature furnace at 900 ° C for 4 hours, and naturally cooled to room temperature and grind finely to obtain a red phosphor NaCa 0.95 PO 4 :0.05Eu 3+ .

[0026] The X-ray diffraction pattern of the red phosphor powder used for the light-emitting diode obtained is shown in the appendix figure 1 (a), the position of each diffraction peak is in good agreement with the standard card JCPDS29-1193, which belongs to NaCaPO 4 Single phase; its excitation spectrum when monitored at 619 nm has strong excitation peaks near 395 nm and 465 nm, which match well with the emission wavelengths of near-ultraviolet and blue LED chips respectively; its excitation at 395 nm or 465 nm , the maximum e...

Embodiment 2

[0028] Raw material is CaCO3 (analytical pure), NaHCO 3 (analytical pure), (NH 4 ) 2 HPO 4 (analytical pure) and Eu 2 o 3 (99.99%), the molar ratio between them is 0.85:1:1:0.075, accurately weigh each raw material and mix and grind evenly, put it in a crucible, put it in a high-temperature furnace at 900 ℃ for 4 hours, and cool naturally to room temperature and grind finely to obtain a red phosphor NaCa 0.85 PO 4 :0.15Eu 3+ .

[0029] The X-ray diffraction pattern of the red phosphor powder used for the light-emitting diode obtained is shown in the appendix figure 1 (b), the position of each diffraction peak is in good agreement with the standard card JCPDS29-1193, which belongs to NaCaPO 4 Single phase; its excitation spectrum when monitored at 619 nm has strong excitation peaks near 395 nm and 465 nm, which match well with the emission wavelengths of near-ultraviolet and blue LED chips respectively; its excitation at 395 nm or 465 nm , the maximum emission wavelen...

Embodiment 3

[0031] Raw material is CaCO 3 (analytical pure), NaHCO 3 (analytical pure), (NH 4 ) 2 HPO 4 (analytical pure) and Eu 2 o 3 (99.99%), the molar ratio between them is 0.8:1:1:0.1, accurately weigh each raw material and mix and grind evenly, put it in a crucible, put it in a high-temperature furnace at 900 ℃ for 4 hours, and cool naturally to room temperature and grind finely to obtain a red phosphor NaCa 0.8 PO 4 :0.2Eu 3+ .

[0032] The X-ray diffraction pattern of the red phosphor powder used for the light-emitting diode obtained is shown in the appendix figure 1 (c), the position of each diffraction peak is in good agreement with the standard card JCPDS29-1193, which belongs to NaCaPO 4 Single phase; its excitation spectrum when monitored at 619 nm has strong excitation peaks near 395 nm and 465 nm, which match well with the emission wavelengths of near-ultraviolet and blue LED chips respectively; its excitation at 395 nm or 465 nm , the maximum emission wavelength...

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Abstract

The invention relates to a phosphate red fluorescent powder for a light-emitting diode and a preparation method thereof. The phosphate red fluorescent powder comprises the following chemical formula: AB<1-x>PO4:xEu<3+> or A<1+y>B<1-x-y>Po4: xEu<3+>, wherein element A is one or more of Li<+>, Na<+> and K<+> alkali metal ions; element B is one or more of Mg<2+>, Ca<2+>, Sr<2+> and Ba<2+> alkaline-earth metal ions; and x is more than 0 and less than or equal to 1, and y is more than or equal to 0 and less than 1. Compared with the prior art, the phosphate red fluorescent powder has the advantages that: the light-emitting efficiency is high and the stability is good; the aim of enhancing the light-emitting intensity of the fluorescent powder is fullfilled; the powder can be excited by a blue-light LED chip and is also suitable for the LED chip emitting blue light; the raw materials are available and cheap; and the preparation method is simple, easy to operate and environmentally-friendly.

Description

technical field [0001] The invention belongs to the technical field of materials, and specifically relates to a fluorescent powder with phosphate as the matrix, activated by trivalent europium, capable of converting near-ultraviolet light or blue light emitted by a light-emitting diode into red light, and a preparation method thereof. Background technique [0002] White light-emitting diodes (LEDs) have high photoelectric conversion efficiency, energy saving (the power is only 1 / 8 of incandescent lamps and 1 / 2 of fluorescent lamps at the same brightness), long service life (over 100,000 hours), safe and reliable ( Fully solidified, will not break), health (no ultraviolet radiation, no electromagnetic radiation, no flicker), environmental protection (no mercury pollution from fluorescent lamps), etc., are currently widely used in mobile communications, urban landscape lighting, car lights, transportation Signal lights, liquid crystal display backlights and other special light...

Claims

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Application Information

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IPC IPC(8): C09K11/71
Inventor 张占辉金亚洪童纯成德福黄志良
Owner WUHAN INSTITUTE OF TECHNOLOGY
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