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Single-substrate fluorescent powder for ultraviolet excitation white-light LED (Light-Emitting Diode) as well as preparation and application methods thereof

An application method and ultraviolet light technology, applied in the direction of chemical instruments and methods, luminescent materials, gas discharge lamps, etc., can solve problems such as poor stability, and achieve the effect of uniform particle size, high luminous intensity, and regular shape

Inactive Publication Date: 2012-03-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention utilizes Sr 2 CeO 4 The matrix itself can emit blue light, and only one activator B ion is used, which can overcome the lack of poor stability of the two activator ions

Method used

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  • Single-substrate fluorescent powder for ultraviolet excitation white-light LED (Light-Emitting Diode) as well as preparation and application methods thereof
  • Single-substrate fluorescent powder for ultraviolet excitation white-light LED (Light-Emitting Diode) as well as preparation and application methods thereof
  • Single-substrate fluorescent powder for ultraviolet excitation white-light LED (Light-Emitting Diode) as well as preparation and application methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh Sr(NO 3 ) 2 and Ce(NO 3 ) 3 As the matrix raw material, take the nitrate of Sm ions with a molar percentage of 0 mol% as an activator, and weigh the nitrate of Li ions with a molar percentage of 0 mol% as a charge compensator, and configure a molar concentration of 0.5 mol / L ammonium oxalate solution as a precipitant for hydrothermal reaction. Matrix raw materials, activators, and charge compensators were mixed with deionized water to form a solution with a total concentration of 0.5mol / L. After stirring for 30 minutes in ultrasonic waves, a precipitant was added, and stirring was continued for 30 minutes to obtain a white precipitate. After filtering, wash with water for 3 The second time, transfer to the hydrothermal reaction kettle for hydrothermal reaction. The hydrothermal reaction temperature is 240°C, the reaction time is 12h, and the filling ratio is 75%. After natural cooling, the precipitate is filtered and washed 3 times, dried at 120°C for 12h, an...

Embodiment 2

[0024] Weigh Sr(NO 3 ) 2 and Ce(NO 3 ) 3 As the matrix raw material, take the nitrate of Sm ion with a molar percentage of 0.125mol% as an activator, and weigh the nitrate of a Li ion with a molar percentage of 0.125mol% as a charge compensator, and configure a molar concentration of 0.5 mol / L ammonium oxalate solution was used as precipitant for hydrothermal reaction. Matrix raw materials, activators, and charge compensators were mixed with deionized water to form a solution with a total concentration of 0.5mol / L. After stirring for 30 minutes in ultrasonic waves, a precipitant was added, and stirring was continued for 30 minutes to obtain a white precipitate. After filtering, wash with water for 3 The second time, transfer to the hydrothermal reaction kettle for hydrothermal reaction. The hydrothermal reaction temperature is 240°C, the reaction time is 12h, and the filling ratio is 75%. After natural cooling, the precipitate is filtered and washed 3 times, dried at 120°C...

Embodiment 3

[0026] Weigh Sr(NO 3 ) 2 and Ce(NO3 ) 3 As the matrix raw material, take the nitrate of Sm ion with a molar percentage of 0.25 mol% as an activator, and weigh the nitrate of a Li ion with a molar percentage of 0.25 mol% as a charge compensator, and configure a molar concentration of 0.5 mol / L ammonium oxalate solution was used as precipitant for hydrothermal reaction. Matrix raw materials, activators, and charge compensators were mixed with deionized water to form a solution with a total concentration of 0.5mol / L. After stirring for 30 minutes in ultrasonic waves, a precipitant was added, and stirring was continued for 30 minutes to obtain a white precipitate. After filtering, wash with water for 3 The second time, transfer to the hydrothermal reaction kettle for hydrothermal reaction. The hydrothermal reaction temperature is 240°C, the reaction time is 12h, and the filling ratio is 75%. After natural cooling, the precipitate is filtered and washed 3 times, dried at 120°C f...

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Abstract

The invention provides single-substrate fluorescent powder for an ultraviolet excitation white-light LED (Light-Emitting Diode) as well as preparation and application methods thereof. The chemical molecular formula of the fluorescent powder is Sr2-x-yAyCeO4:xB<3+>, wherein A is selected from one of Li, Na and Mg, B is selected from one of Eu, Pr, Cr and Sm, x is not less than 0 and not more than 0.02, and y is not less than 0 and not more than 0.02. The single-substrate fluorescent powder is prepared through a hydrothermal method and a posttreatment incineration method. In the invention, according to the characteristic that the substrate Sr2CeO4 can give out broad-peak blue and green lights under the excitation of ultraviolet light and can give out red light with the doping of ion B, the purpose of compounding the blue and green lights and the red light to white light by regulating the proportion of x and changing the intensity of the red light is achieved. The doped ion A is used as a charge extender in the whole structure. The single-substrate fluorescent powder has the characteristics of high luminous intensity, even granularity, good dispersity, simple components, good chemical stability and the like.

Description

technical field [0001] The invention relates to a fluorescent powder in the field of luminescent materials and a preparation and application method thereof, in particular to a single matrix fluorescent powder for white light LED excited by ultraviolet light and a preparation and application method thereof. Background technique [0002] White LED (Light Emitting Diode) has excellent performance, so it has a good application prospect in lighting, display and other fields. Among the many methods of preparing white LEDs, the method of coating yellow phosphor powder on blue LED chips and mixing blue light and yellow light to obtain white light is the most widely used method for manufacturing white LEDs. However, the white light LED manufactured by this method has the disadvantages of low color rendering index and unrealizable low color temperature, so that it cannot be widely used in indoor lighting. In order to solve the above problems, the use of near-ultraviolet chips to exci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78H01L33/50
CPCY02B20/181Y02B20/00
Inventor 刘素琴周智王锋超黄可龙蒋葵明曾少波刘清玲
Owner CENT SOUTH UNIV
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