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Method for preparing nitride red fluorescent powder for white light LED

A technology of nitride phosphors and red phosphors, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of complex circuit design, high cost, immature technology, etc., and achieve good chemical and thermal stability , strong absorption and high heat quenching temperature

Inactive Publication Date: 2009-10-28
IRICO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to achieve white light by this method, because to achieve stable and efficient white light, the driving characteristics of three different color chips must be considered, and the circuit design is very complicated.
The second is to use the quantum effect to achieve single-chip white light, that is, to use the same semiconductor with different particle sizes to prepare chips to achieve white light. The white light LED realized by this method has high efficiency, but the cost is high, and at the same time, it is technically unsatisfactory. Mature

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  • Method for preparing nitride red fluorescent powder for white light LED

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Embodiment 1

[0010] Embodiment 1: A kind of preparation method of nitride red fluorescent powder for white light LED, this method follows the following steps: 1.98 moles of compound A, 0.02 moles of EuN 0.95 and 1.67 moles of amorphous Si 3 N 4 Mix well to get a mixture, in N 2 and H 2 After the mixture was fired at 1350 ° C for 15 hours in a mixed atmosphere with a volume ratio of 9:1, it was cooled to room temperature and ground for the first time to obtain the first grinding product. 2 and H 2 In a mixed atmosphere with a volume ratio of 9:1, burn the first grinding product at 1450°C for 13 hours, take it out after cooling to room temperature, and perform the second grinding to obtain the second grinding product. The second grinding The product passes through a 150-mesh sieve to obtain a nitride red phosphor powder for white light LEDs; the compound A is SrN x , x=0.65 in compound A.

Embodiment 2

[0011] Embodiment 2: A kind of preparation method of nitride red fluorescent powder for white light LED, this method follows the following steps: 1.995 moles of compound A, 0.005 moles of EuN 0.95 and 1.67 moles of amorphous Si 3 N 4 Mix well to get a mixture, in N 2 and H 2 After the mixture was fired at 1350 ° C for 15 hours in a mixed atmosphere with a volume ratio of 9:1, it was cooled to room temperature and ground for the first time to obtain the first grinding product. 2 and H 2 In a mixed atmosphere with a volume ratio of 9:1, burn the first grinding product at 1450°C for 13 hours, take it out after cooling to room temperature, and perform the second grinding to obtain the second grinding product. The second grinding The product passes through a 150-mesh sieve to obtain a nitride red phosphor powder for white light LEDs; the compound A is SrN x , x=0.65 in compound A.

Embodiment 3

[0012] Embodiment 3: A kind of preparation method of nitride red fluorescent powder for white light LED, this method follows the following steps: 1.999 moles of compound A, 0.001 moles of EuN 0.95 and 1.67 moles of amorphous Si 3 N 4 Mix well to get a mixture, in N 2 and H 2 After the mixture was fired at 1350 ° C for 15 hours in a mixed atmosphere with a volume ratio of 9:1, it was cooled to room temperature and ground for the first time to obtain the first grinding product. 2 and H 2 In a mixed atmosphere with a volume ratio of 9:1, burn the first grinding product at 1450°C for 13 hours, take it out after cooling to room temperature, and perform the second grinding to obtain the second grinding product. The second grinding The product passes through a 150-mesh sieve to obtain a nitride red phosphor powder for white light LEDs; the compound A is SrN x , x=0.65 in compound A.

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Abstract

The invention discloses a method for preparing nitride red fluorescent powder for a white light LED, which comprises the following steps: sufficiently mixing 1.98 to 1.999 mol of compound A, 0.001 to 0.02 mol of EuN0.95 and 1.67 mol of amorphous Si3N4 to obtain a mixture; burning the mixture at a temperature of 1,350 DEG C for 15 hours and then cooling the mixture to room temperature for the first time grinding; reburning the product of the first time grinding at a temperature of 1,450 DEG C for 13 hours, and cooling the product to the room temperature; and taking the product out for the second time grinding, and screening the product through a 150-mesh screen cloth after the second time grinding to obtain the nitride red fluorescent powder for the white light LED. The compound A is SrNx, BaNx or Ca3N2. The chemical and thermal stabilities of the nitride fluorescent powder is good, the absorption from an ultraviolet light zone to a blue light zone is strong, the thermal quenching temperature is high, and the nitride fluorescent powder can absorb light in a range of between 250 and 600 nanometers and emit red light of which the peak value is between 590 and 660 nanometers.

Description

Technical field: [0001] The invention belongs to the field of rare earth luminescence and semiconductor solid-state lighting, and relates to a rare earth luminescent material used in white LED packaging, in particular to a nitride red fluorescent powder for white LED (light emitting diode) and a preparation method thereof. Background technique: [0002] With the continuous improvement of LED lumen efficiency and the gradual reduction of cost, it will become the mainstream of lighting by virtue of its long service life. If LED enters the field of general lighting, high-efficiency white LED must be obtained. At present, there are three main ways to realize white LED lighting. The first is to form white light through the combination of red, green and blue LED chips. However, it is difficult to realize white light by this method, because to realize stable and efficient white light, the driving characteristics of three different color chips must be considered, and the circuit des...

Claims

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Application Information

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IPC IPC(8): C09K11/59H01L33/00
Inventor 王大伟
Owner IRICO
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