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Red fluorescent material and preparation method thereof

A technology excited by red fluorescence and blue light, which is applied in the field of red fluorescent materials and preparation, can solve the problems of easy deliquescence, poor stability, low efficiency, etc., and achieve the effect of not easy deliquescence and good stability

Inactive Publication Date: 2011-08-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] So far, there are three main preparation technologies for white LEDs: (1) The combination of red / green / blue LEDs. This method can adjust the color at will, but the power supply is complicated and the cost is high.
(2) The combination of ultraviolet LED and multi-color phosphor, this method has the best color rendering, but the current efficiency is low
However, this kind of phosphor has poor stability and is easy to deliquesce, so it must be coated

Method used

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  • Red fluorescent material and preparation method thereof
  • Red fluorescent material and preparation method thereof
  • Red fluorescent material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare x=0.003 (Bi 0.5 Na 0.5 ) 1-x PR x TiO 3 material, namely (Bi 0.5 Na 0.5 ) 0.997 PR 0.003 TiO 3 . Select raw material Na 2 CO 3 、Pr 6 o 11 、 Bi2 o 3 and TiO 2 , according to (Bi 0.5 Na 0.5 ) 1-x PR x TiO 3 Weigh the selected raw materials in the proportion of corresponding elements, Na 2 CO 3 =2.6957g, Pr 6 o 11 =0.0516g, Bi 2 o 3 = 12.9045g and TiO 2 =7.9980g, after mixing the raw materials weighed, put into the ball mill jar and add dehydrated alcohol and zirconia balls to ball mill for 24 hours on the ball mill, and obtain the ball mill powder after discharging and drying with dehydrated alcohol, wherein dehydrated alcohol and The mass ratio of the raw material mixture is 3:1, and the mass ratio of the zirconia balls to the raw material mixture is 1.5:1. Put the ball mill powder in an alumina crucible for pre-burning, the pre-burning temperature is 850°C, the heating rate is 3°C / min, keep warm for 4 hours and cool naturally to get th...

Embodiment 2

[0034] Preparation (Bi 0.5 Na 0.5 ) 0.999 PR 0.001 TiO 3 , (Bi 0.5 Na 0.5 ) 0.998 PR 0.002 TiO 3 , (Bi 0.5 Na 0.5 ) 0.995 PR 0.005 TiO 3 and (Bi 0.5 Na 0.5 ) / 0.99 PR 0.01 TiO 3 . Select raw material Na 2 CO 3 、Pr 6 o 11 、 Bi 2 o 3 and TiO 2 , according to the chemical expression (Bi 0.5 Na 0.5 ) 0.999 PR 0.001 TiO 3 , (Bi 0.5 Na 0.5 ) 0.998 PR 0.002 TiO 3 , (Bi 0.5 Na 0.5 ) 0.995 PR 0.005 TiO 3 and (Bi 0.5 Na 0.5 ) 0.99 PR 0.01 TiO 3 Weigh the selected raw materials respectively, mix the weighed raw materials respectively, put them into a ball mill tank, add absolute ethanol and zirconia balls, and ball mill on the ball mill for 24 hours, discharge and dry with absolute ethanol, and then respectively Ball milling powders Al, A2, A3 and A4 were obtained, wherein the mass ratio of absolute ethanol to the raw material mixture was 2:1, and the mass ratio of zirconia balls to the raw material mixture was 1:1. The ball mill powders A1, ...

Embodiment 3

[0039] Preparation material (Bi 0.5 Na 0.5 ) 0.99 Eu 0.01 TiO 3 . Select raw material Na 2 CO 3 、Eu 2 o 3 、 Bi 2 o 3 and TiO 2 , according to (Bi 0.5 Na 0.5 ) 0.99 Eu 0.01 TiO 3 The ratio of the corresponding elements in Weigh the selected raw materials, Na 2 CO 3 =2.6768g, Eu 2 o 3 =0.1760g, Bi 2 o 3 = 11.6490g and TiO 2=7.9980g, after mixing the raw materials weighed, put into the ball mill jar and add dehydrated alcohol and zirconia balls to ball mill for 24 hours on the ball mill, and obtain the ball mill powder after discharging and drying with dehydrated alcohol, wherein dehydrated alcohol and The mass ratio of the raw material mixture is 1:1, and the mass ratio of the zirconia balls to the raw material mixture is 1.5:1. Put the ball mill powder in an alumina crucible for pre-burning, the pre-burning temperature is 750°C, the heating rate is 3°C / min, keep warm for 6 hours and cool naturally to get the pre-fired powder, grind the pre-fired powder an...

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Abstract

The invention relates to a novel blue-light-excited red fluorescent material applied to a white light LED (Light Emitting Diode) technology and a preparation method thereof, belonging to the field of light-emitting materials. The blue-light-excited red fluorescent material has a general formula of Bi0.5+dNa0.5-yAy)1-xRxTiO3:fC, wherein R is selected from one or more than one of rare-earth elements Pr, Sm, Eu and Lu, A is selected from one or more than one of the same group of univalent elements K and Li, C is selected from one or more than one of Li, Na, K, Tl and Ag, 0.001<=x<=0.1, 0<=y<=0.5, 0<=d<=0.1, and 0<=f<=0.1. Blue-light-excited red fluorescent powder provided by the invention has good stability, is not easy to deliquesce, does not need cladding treatment, not only has piezoelectric, ferroelectric and dielectric properties, but also has the characteristic of exciting red light by blue light, belongs to a multifunctional photoelectric material, and can be widely applied to fields such as white light LEDs, photoelectricity integration, micro electro mechanical systems, photoelectricity sensors and the like.

Description

technical field [0001] The invention relates to a novel blue-light-excited red fluorescent material that can be used in white light LED technology and a preparation method thereof, and belongs to the technical field of light-emitting materials. Background technique [0002] White light LED has the advantages of low energy consumption, long life, small size, light weight, good directionality, fast response, solidification, no pollution and resistance to various harsh conditions. It is known as the successor to incandescent lamps, fluorescent lamps and high-intensity gas discharge lamps. After the fourth generation of lighting sources. Since the first white LED came out in 1996, it has developed rapidly and its luminous efficiency has been continuously improved. It is expected to replace traditional lighting sources such as incandescent lamps, fluorescent lamps and high-pressure mercury lamps, and become the most promising green lighting source in the 21st century. [0003] S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78H01L33/50
Inventor 王旭升孙海勤彭登峰唐棉棉张奇伟
Owner TONGJI UNIV
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