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Rare earth double primary colour luminescent material for converting white light by utilizing violet light LED (light-emitting diode) and preparation method thereof

A technology of luminescent materials and dichroic colors, which is applied in the direction of luminescent materials, chemical instruments and methods, and the use of gas discharge lamps. It can solve the problems of color space uniformity and failure to meet indoor lighting, etc., and achieve the effect of simple process

Inactive Publication Date: 2011-11-02
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, commercial white LEDs use blue LED chips to excite yellow phosphors to produce white light. Since the blue light emitted by the chip directly participates in the formation of white light, there are serious defects in the uniformity of color space, which cannot meet the needs of indoor lighting.

Method used

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  • Rare earth double primary colour luminescent material for converting white light by utilizing violet light LED (light-emitting diode) and preparation method thereof
  • Rare earth double primary colour luminescent material for converting white light by utilizing violet light LED (light-emitting diode) and preparation method thereof
  • Rare earth double primary colour luminescent material for converting white light by utilizing violet light LED (light-emitting diode) and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] 1 Preparation of blue phosphor powder

[0031] Materials are selected according to their chemical structure M 0.1 N 3.88 Si 3 O 8 Cl 4 :R 0.02 , when M is the Mg element, N is the Sr element, and R is the Eu element, the following high-purity materials are weighed according to their weight percentages:

[0032] SrCO 3 : 23.58% SrCl 2 .6H 2 O: 55.22%

[0033] SiO 2 : 18.61% Eu 2 o 3 : 0.93%

[0034] MgO: 1.66%

[0035] ① Grind and mix the above weighed materials evenly, put them into a small alumina crucible and cover them, put the small crucible into a large crucible, bury the small crucible with activated carbon and cover it, and then put it in a high temperature furnace at 900°C calcined for 2 hours.

[0036] ② After the sample is cooled, take it out and grind it finely, put it into a small alumina crucible and cover it, put the small crucible into a large crucible, bury the small crucible with activated carbon and cover it, and then put it into ...

example 2

[0045] 1 Preparation of blue phosphor powder

[0046] ①Materials are selected according to their chemical structural formula M 0.15 N 3.82 Si 3 O 8 Cl 4 :R 0.03 , when M is the Mg element, N is the Sr element, and R is the Eu element, the following high-purity materials are weighed according to their weight percentages:

[0047] SrCO 3 : 22.01% SrCl 2 .6H 2 O: 55.21%

[0048] SiO 2 : 19.11% Eu 2 o 3 : 1.92%

[0049] MgO: 1.75%

[0050] ② It is put into a high-temperature furnace and calcined at 950°C for 2.5 hours. It was then put into a high-temperature furnace for calcination at 950° C. for 1.5 hours. The sintering synthesis steps are the same as the example one.

[0051] 2 Preparation of yellow phosphor powder

[0052] ①Materials are selected according to their chemical structural formula W 0.15 S 3.81 Si 3 O 8 Cl 4 :Y 0.04 ·T 0 , when W is the Ca element, S is the Sr element, Y is the Eu element, and T is the Mn element, the following...

example 3

[0058] 1 Preparation of blue phosphor powder

[0059] ①Materials are selected according to their chemical structural formula M 0.35 N 3.71 Si 3 O 8 Cl 4 :R 0.04 , when M is the Mg element, N is the Sr element, and R is the Eu element, the following high-purity materials are weighed according to their weight percentages:

[0060] SrCO 3 : 22.88% SrCl 2 .6H 2 O: 53.75%

[0061] SiO 2 : 18.71% Eu 2 o 3 : 2.91%

[0062] MgO: 1.75%

[0063] ②Put it in a high temperature furnace for calcination at 1000°C for 3 hours, and then put it in a high temperature furnace for calcination at 1000°C for 2 hours. The sintering synthesis steps are the same as the example one.

[0064] 2 Preparation of yellow phosphor powder

[0065] ①Materials are selected according to their chemical structural formula W 0.35 S 3.71 Si 3 O 8 Cl 4 :Y 0.04 ·T 0 , when W is the Ca element, S is the Sr element, Y is the Eu element, and T is the Mn element, the following high-puri...

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Abstract

The invention belongs to the technical field of luminescence and display, relating to blue and yellow luminescent materials in a novel rare earth double primary colour luminescent material for converting white light by utilizing a violet light LED (light-emitting diode). The structural formulas of blue phosphor powder and yellow phosphor powder are MxN(4-x-y)Si3O8Cl4: Ry and WxS(4-x-y)Si3O8Cl4: Yy. Tz, wherein N is Sr element when M is Mg, and the phosphor powder is blue when R is Eu element. When W is Ca, S is Sr element and Y is Eu element, and the phosphor powder is yellow when T is Mn element. Materials are respectively weighed according to mass percent, after fully grinding and evenly mixing, calcining at a high temperature is carried out, a mixture is taken out after cooling is carried out, grinding is carried out, then high temperature calcining is carried out, and a sample is cooled and taken out to be ground, thus a power crystal emitting bright blue light or yellow light under the excitation of violet light is obtained. The blue phosphor powder and the yellow phosphor powder are mixed in a certain proportion to realize white light phosphor powder with different colour temperatures.

Description

technical field [0001] The invention belongs to the technical field of luminescence and display, and relates to a rare-earth dichromatic luminescent material for violet LED to convert white light and a preparation method thereof. Background technique [0002] Due to its small size, low power consumption, long life, less pollution, low heat generation and fast response, white LED has become the first choice for the next generation lighting technology. At present, commercial white LEDs use blue LED chips to excite yellow phosphors to produce white light. Since the blue light emitted by the chips directly participates in the formation of white light, there are serious defects in the uniformity of color space, which cannot meet the needs of indoor lighting. This technical problem can be solved by using violet or near-ultraviolet light, which has little influence on the color coordinates of white light, to excite broad-band blue and yellow dichromatic phosphors to produce white l...

Claims

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Application Information

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IPC IPC(8): C09K11/86H01L33/50
CPCY02B20/181Y02B20/00
Inventor 张昕彤刘益春曹剑戴鹏鹏赵成久
Owner NORTHEAST NORMAL UNIVERSITY
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