Fluorescent material emitting red and green light excited by blue light and preparation method thereof

A blue light excitation and fluorescent material technology, applied in the field of luminescent materials, can solve the problems of mixed white light chromatic aberration, complicated power supply, low color rendering index, etc.

Inactive Publication Date: 2011-12-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Assemble red, green and blue primary color LED chips to achieve white light. This method can adjust the color at will, but because the light output of LED devices will decrease with the increase of temperature, the degree of decline of LEDs of different colors is very different. It will cause chromatic aberration of mixed white light; and different LED chips require different power supply devices, which will lead to complex power supply and high cost, so the application of three-color LED chip assembly to achieve white light is limited
[0005] (2)

Method used

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  • Fluorescent material emitting red and green light excited by blue light and preparation method thereof
  • Fluorescent material emitting red and green light excited by blue light and preparation method thereof
  • Fluorescent material emitting red and green light excited by blue light and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation (Na 0.5 K 0.5 ) 1-x PR x NbO 3 Fluorescent material, wherein the values ​​of x are respectively x=0.001, 0.003, 0.005, and 0.01.

[0042] Select raw material NaCO 3 、KCO 3 、Pr 6 o 11 and Nb 2 o 5 , according to (Na 0.5 K 0.5 ) 1-x PR x NbO 3 (x=0.001, 0.003, 0.005, 0.01) in the stoichiometric ratio of the corresponding elements Weigh the selected raw materials respectively, mix the corresponding raw materials, put them into the ball mill tank, add absolute ethanol and zirconia balls in the ball mill After ball milling for 24 hours, discharge and dry with absolute ethanol to obtain ball mill powder, wherein the mass ratio of absolute ethanol to raw material mixture is 3:1, and the mass ratio of zirconia balls to raw material mixture is 1.5:1. The ball mill powder was pre-fired in an alumina crucible, the pre-fire temperature was 880°C, and the heating rate was 3°C / min. Water ethanol and zirconia balls are ball-milled for 24 hours and dried, th...

Embodiment 2

[0047] Preparation (Na 0.6 K 0.4 Li 0.1 ) 0.995 PR 0.005 NbO 3 : 0.05K fluorescent material.

[0048] Select raw material Na 2 CO 3 、K 2 CO 3 、Pr 6 o 11 , Nb 2 o 5 and Li 2 CO 3 , according to (Na 0.6 K 0.4 Li 0.1 ) 0.995 PR 0.005 NbO 3 : The stoichiometric ratio of the corresponding elements in 0.05K weighs the selected raw materials respectively, mixes the corresponding raw materials that have been weighed, puts them into a ball mill jar, adds absolute ethanol and zirconia balls, and ball mills them on the ball mill for 24 hours, then use The water and ethanol are discharged and dried to obtain ball mill powder, wherein the mass ratio of absolute ethanol to the raw material mixture is 2:1, and the mass ratio of zirconia balls to the raw material mixture is 1:1. Put the ball mill powder in an alumina crucible for pre-burning, the pre-burning temperature is 800°C, the heating rate is 3°C / min, keep it warm for 1 hour and cool naturally to get the pre-fired ...

Embodiment 3

[0053] Preparation (Na 0.6 K 0.01 Na 0.49 ) 0.995 PR 0.005 NbO 3 : 0.1Na fluorescent material.

[0054] Select raw material Na 2 CO 3 、K 2 CO 3 、Pr 6 o 11 and Nb 2 o 5 , according to (Na 0.6 K 0.01 Na 0.49 ) 0.995 PR 0.005 NbO 3 : The stoichiometric ratio of the corresponding elements in 0.1Na is respectively weighed the selected raw materials, after the corresponding raw materials weighed are mixed, put into the ball mill tank, add absolute ethanol and zirconia balls and ball mill on the ball mill for 24 hours, then use The water and ethanol are discharged and dried to obtain ball mill powder, wherein the mass ratio of absolute ethanol to the raw material mixture is 1:1, and the mass ratio of 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 900°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-...

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PUM

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Abstract

Belonging to the technical field of luminescent materials, the invention relates to a fluorescent material able to emit red and green lights under the excitation of blue lights and a preparation method thereof. The fluorescent material of the invention has a general chemical formula of (Na0.5+deltaK0.5-yAy)1-xPrxNbO3: phiC or (Na0.5-yK0.5+deltaAy)1-xPrxNbO3: phiC, wherein, A is one or more of Li, Na and K, C is one or more of Li, Na, K, T1 and Ag, with x greater than or equal to 0.001 and smaller than or equal to 0.01, y greater than or equal to 0 and smaller than 0.5, delta greater than or equal to 0 and smaller than or equal to 0.1, and phi greater than or equal to 0 and smaller than or equal to 0.1. Inherently with piezoelectric, ferroelectric and dielectric properties, the fluorescent material provided in the invention simultaneously has a photoluminescence characteristic when excited by blue lights. Belonging to photoelectric multifunctional materials, the fluorescent material of the invention can be applied to the white LED field, and is expected to be widely applied in the fields of optoelectronic integration, micro electromechanics, photoelectric sensing, etc.

Description

technical field [0001] The invention relates to a fluorescent material emitting red and green light excited by blue light and a preparation method thereof, belonging to the technical field of luminescent 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] At present, there are three mai...

Claims

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Application Information

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IPC IPC(8): C09K11/78H01L33/50B81B7/02G01N21/64
CPCY02B20/181Y02B20/00
Inventor 王旭升孙海勤彭登峰唐棉棉张奇伟李艳霞
Owner TONGJI UNIV
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