Red rare earth luminescent material for purple light LED conversion white light and preparation thereof

A technology of rare earth luminescence and purple light, which is applied in the direction of luminescent materials, chemical instruments and methods, and the use of gas discharge lamps, and can solve the problems of affecting luminescence performance and unstable performance.

Inactive Publication Date: 2009-01-21
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing red rare earth luminescent materials such as CaS:Eu 2+ , SrCaS:Eu 2+ , Y 2 o 2 S:Eu 2+ , SrSiO 4 :Eu 2+ Unstable performance, etc., affecting its luminous performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] ①Materials are selected according to the chemical structural formula M·N 1-a-b (MoO 4 ) 2-x (SiO 4 ) x :Ra·Rb

[0019] When M is K, N 1-a-b When Na is Na, Ra is Eu element, and Rb is Tb element, the following seven high-purity materials are weighed according to their weight percentages:

[0020] K 2 CO 3 -4.125 MoO 3 -81.877

[0021] Na 2 CO 3 -2.621 SiO 2 -5.972

[0022] Eu 2 o 3 -5.325 NH 4 F-0.03

[0023] Tb 4 o 4 -0.05

[0024] ② Grind and mix the above-mentioned weighed materials evenly, put them into an alumina crucible, cover them, put them in a high-temperature furnace, and sinter in air at 900°C for 3 hours.

[0025] ③ After cooling, take it out and pulverize it, then put it into an alumina crucible and cover it in a high-temperature furnace and sinter in air at 900°C for 3 hours, cool it, take it out and pulverize it to obtain a crystal powder that emits bright red light under the excitation of ultraviolet 365nm and purple LED.

example 2

[0027] Material selection is based on the chemical structural formula M N 1-a-b (MoO 4 ) 2-x (SiO 4 ) x :Ra·Rb

[0028] When M is Li, N 1-a-b When Na is Na, Ra is Eu element, and Rb is Tb element, the following seven high-purity materials are weighed according to their weight percentages:

[0029] Li 2 CO 3 -2.935 MoO 3 -81.952-82.552

[0030] Na 2 CO 3 -2.965 SiO 2 -5.650-5.972

[0031] Eu 2 o 3 -5.496 NH 4 F-0.03

[0032] Tb 4 o 7 -0.05

[0033] The sintering synthesis steps are the same as in Example 1, the ② step sintering temperature is 800°C, the time is 2 hours, the ③ step sintering temperature is 800°C, the time is 2.5 hours.

example 3

[0035] Material selection is based on the chemical structural formula M N 1-a-b (MoO 4 ) 2-x (SiO 4 ) x :Ra·Rb

[0036] When M is Li and Ba, N 1-a-b When Na is Na, Ra is Eu element, and Rb is Tb element, the following seven high-purity materials are weighed according to their weight percentages:

[0037] Li 2 CO 3 -2.055 MoO 3 -82.552

[0038] Ba 2 CO 3 -0.965 SiO 2 -5.896

[0039] Na 2 CO 3 -2.965 NH 4 F-0.03

[0040] Eu2O3-5.496 Tb 4 o 7 -0.05

[0041] The sintering synthesis steps are the same as in Example 1, the ② step sintering temperature is 600°C, the time is 2.5 hours, the ③ step sintering temperature is 600°C, the time is 4 hours

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PUM

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Abstract

The invention belongs to the luminescence and display technical field, in particular to a novel red rare earth luminescent material for transferring white light by a violet LED. The structural formula of the novel red rare earth luminescent material is M.N1-a-b(MoO4)2-x(SiO4)x:Ra.Rb, wherein M refers to alkali metal Li element or K element or alkali metal Li and Ba element or K and Ba element; N1-a-b refers to alkali metal Na element; and quantitive latent solvent is added. The materials of the compositions of the M.N1-a-b (MoO4) 2-x (SiO4) x: Ra.Rb are weighed by weight percent; the weighed materials are fully grinded and uniformly mixed and then added into an alumina crucible which is covered and placed into a high-temperature furnace and sintered in the air; after the mixture is cooled, the mixture is taken out and crushed and then added into the alumina crucible which is then covered and placed into the high-temperature furnace and sintered in the air; and the mixture is cooled, taken out and grinded, and then the red crystal powder which gives out red light within 365 nanometers under excitation of the violet LED is obtained.

Description

Technical field: [0001] The invention belongs to the technical field of light emission and display, and in particular relates to a novel red rare earth luminescent material for purple light LED to convert white light. Background technique: [0002] At present, due to the rapid development of semiconductor technology, the technology of converting white light from blue LEDs has matured, while the technology of converting white light from purple LEDs is on the rise. In order to further improve the luminous efficiency and color rendering index of purple LEDs to convert white light, so as to make them commercially available, in addition to the improvement of purple LED chip technology, it is mainly to convert white light with three primary colors of rare earth red, blue, and green light-emitting materials. The performance is improved, especially the luminous efficiency and stability of the red rare earth luminescent material are improved. However, the existing red rare earth lum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79H01L33/00H01L33/50
CPCY02B20/181Y02B20/00
Inventor 刘益春张昕彤刘玉学赵成久
Owner NORTHEAST NORMAL UNIVERSITY
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