Unlock instant, AI-driven research and patent intelligence for your innovation.

Green fluorescent powder for white light LED suitable for blue light excitation and preparation method thereof

A technology of green phosphor and blue light excitation is applied in the field of phosphors that can be excited by blue light to emit green light, and achieves the effects of low cost and simple preparation method.

Inactive Publication Date: 2012-06-13
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the alkaline earth chlorosilicate phosphor mainly includes Ca 8 Mg(SiO 4 ) 4 Cl 2 :Eu 2+ 、Sr 4 Si 3 o 8 Cl 4 :Eu 2+ , Ca 3 SiO 4 Cl 2 :Eu 2+ and Ba 5 SiO 4 Cl 4 :Eu 2+ , but these materials are only suitable for near-ultraviolet (365-400nm) excitation, and green phosphors suitable for blue light excitation have not been reported.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Green fluorescent powder for white light LED suitable for blue light excitation and preparation method thereof
  • Green fluorescent powder for white light LED suitable for blue light excitation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Ca 2.555 [Li + Ce 3+ ] 0.02 Zn 0.4 SiO 4 Cl 2 :Eu 2+ 0.005 (where x=0.005, y=0.02, z=0.4).

[0016] Weigh 0.778g CaCO according to the stoichiometric ratio of each component in the above formula 3 , 0.300g SiO 2 , 0.666g CaCl 2 , 0.163g ZnO, 0.005g Eu 2 o 3 ,, 0.017g CeO 2 , 0.004g Li 2 CO 3 ; After fully grinding and mixing the weighed raw materials, put them into a crucible, put them in a low-temperature furnace, and heat them under 5% H 2 and 95%N 2 Under the condition of reducing atmosphere, heating at 850°C for 4 hours can obtain the green phosphor Ca 2.555 [Li + Ce 3+ ] 0.02 Zn 0.4 SiO 4 Cl 2 :Eu 2+ 0.005 .

Embodiment 2

[0018] Ca 2.57 [Li + Ce 3+ ] 0.005 Zn 0.4 SiO 4 Cl 2 :Eu 2+ 0.02 (where x=0.02, y=0.005, z=0.4).

[0019] Weigh 0.786g CaCO according to the stoichiometric ratio of each component in the above formula 3 , 0.300g SiO 2 , 0.666g CaCl 2 , 0.163g ZnO, 0.018g Eu 2 o 3 ,, 0.004g CeO 2 , 0.001g Li 2 CO 3 ; After fully grinding and mixing the weighed raw materials, put them into a crucible, put them in a low-temperature furnace, and heat them under 20% H 2 and 80%N 2 Under the condition of reducing atmosphere, heating at 850°C for 4 hours can obtain the green phosphor Ca 2.57 [Li + Ce 3+ ] 0.005 Zn 0.4 SiO 4 Cl 2 :Eu 2+ 0.02 .

Embodiment 3

[0021] Ca 2.54 [Li + Ce 3+ ] 0.02 Zn 0.4 SiO 4 Cl 2 :Eu 2+ 0.02 (where x=0.02, y=0.02, z=0.4).

[0022] Weigh 0.771g CaCO according to the stoichiometric ratio of each component in the above formula 3 , 0.300g SiO 2 , 0.666g CaCl 2 , 0.163g ZnO, 0.018g Eu 2 o 3 ,, 0.017g CeO 2 , 0.004g Li 2 CO 3 ; After fully grinding and mixing the weighed raw materials, put them into a crucible, put them in a low-temperature furnace, and heat them under 5% H 2 and 95%N 2Under the condition of reducing atmosphere, heating at 850°C for 4 hours can obtain the green phosphor Ca 2.54 [Li + Ce 3+ ] 0.02 Zn 0.4 SiO 4 Cl 2 :Eu 2+ 0.02 .

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to green fluorescent powder for white light LED suitable for blue light excitation. The chemical structural formula of the green fluorescent powder is Ca[3-x-2y-z][M<+>Ce<3+>][y]Zn[z]SiO4Cl2:Eu<2+>[x], wherein M<+> is one of alkali metal ions of Li<+>, Na<+> and K<+>, x is more than or equal to 0.005 and is less than or equal to 0.1, y is more than or equal to 0.005 and is less than or equal to 0.1, and z is more than or equal to 0.01 and is less than or equal to 1.5. The preparation method comprises the following steps: after calcium carbonate, silicon dioxide, calcium chloride, europium oxide, zinc oxide, cerium dioxide and lithium carbonate or sodium carbonate or potassium carbonate are milled and mixed uniformly, the mixture is sintered for 3 to 6 hours at the temperature of 800 to 850 DEG C under the reducing atmosphere of H2 or the gas mixture of H2 and N2, and then the mixture is milled after being cooled to obtain the green fluorescent powder. The preparation method of the green fluorescent powder has the advantages of simplicity, no pollution and low cost.

Description

technical field [0001] The invention relates to a fluorescent powder for preparing white light LEDs, in particular to a fluorescent powder that can be excited by blue light to emit green light. Background technique [0002] White LED (Light Emitting Diode) has many advantages such as non-toxic, long life (100,000 hours), high efficiency and energy saving, all solid state, low working voltage, shock resistance and good safety, and can be widely used in various lighting facilities. Including indoor lights, traffic lights, street lights, automobile tail lights, direction lights, brake lights, outdoor super-large screens, display screens and advertising boards, etc., is an environmentally friendly, energy-saving green lighting source, is generally considered to be 21 A new light source that replaces traditional lighting devices in the century. However, the efficiency of the developed white LED green phosphors is not high, especially there are few green phosphors suitable for bl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/86
Inventor 张家骅吕伟张霞
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI