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Carbuncle type yellow fluorescent material Y3Al5O12:Ce,Li preparation method

A y3al5o12, fluorescent material technology, applied in the field of fluorescent materials, can solve problems such as unsatisfactory luminous efficiency, and achieve the effect of improving luminous efficiency

Inactive Publication Date: 2006-02-15
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the surface and interface effects of nanomaterials, the crystal grains are not fully developed, and the luminous efficiency is not ideal.

Method used

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  • Carbuncle type yellow fluorescent material Y3Al5O12:Ce,Li preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Select x=0.01 and y=0.04, according to Y (3-x-y) Ce x Li y Al 5 o 12 According to the molar ratio of the raw materials, the corresponding yttrium nitrate, cerium nitrate, lithium nitrate and aluminum nitrate were weighed and dissolved in deionized water to obtain a solution. After fully mixing, add citric acid, the number of moles of citric acid is 2.4 times of that of aluminum nitrate. Adjust the pH value of the solution to 6, heat and evaporate in a water bath, control the temperature at 80°C, and keep stirring until a transparent colloid is formed. This sol is then further heated to form a gel. The precursor powder was obtained after the gel was burned in an environment of 200 °C. The precursor powder was then calcined at 900 °C.

[0028] figure 1 is Y 3 Al 5 o 12 : Ce, Li Example 1 and Y 3 Al 5 o 12 : Comparison of fluorescence spectra of Ce. It can be seen from the figure that in Y 3 Al 5 o 12 : Doping Li in Ce increases its luminous intensity abo...

Embodiment 2

[0030] Select x=0.04 and y=0.08, according to Y (3-x-y) Ce x Li y Al 5 o 12 According to the molar ratio of the raw materials, the corresponding yttrium nitrate, cerium nitrate, lithium nitrate and aluminum nitrate were weighed and dissolved in deionized water to obtain a solution. Add citric acid after fully mixing, and the molar number of citric acid is 3.2 times of that of aluminum nitrate. Adjust the pH value of the solution to 5, heat and evaporate in a water bath, control the temperature at 70°C, and keep stirring until a transparent colloid is formed. This sol is then further heated to form a gel. The precursor powder was obtained after the gel was burned in an environment of 220 °C. The precursor powder was then calcined at 1200 °C.

Embodiment 3

[0032] Select x=0.1 and y=0.01, according to Y (3-x-y) Ce x Li y Al 5 o 12 According to the molar ratio of the raw materials, the corresponding yttrium nitrate, cerium nitrate, lithium nitrate and aluminum nitrate were weighed and dissolved in deionized water to obtain a solution. After fully mixing, add citric acid, the number of moles of citric acid is 1.6 times of that of aluminum nitrate. Adjust the pH value of the solution to 5, heat and evaporate in a water bath, control the temperature at 70°C, and keep stirring until a transparent colloid is formed. This sol is then further heated to form a gel. The precursor powder was obtained after the gel was burned in an environment of 240 °C. The precursor powder was then calcined at 850 °C.

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PUM

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Abstract

The preparation method for garnet yellow-light fluorescent material Y3Al5O12:Ce,Li comprises following steps: selecting material with mole proportion: (3-x-y) yttrium nitrate, x cerous nitrate, y lithium nitrate and 5 aluminum nitrate, wherein, 0.01<=x<=0.1, 0.01<=y<=0.08; determining x and y for proper nitrate to dissolve into deionized water; mixing evenly, adding citrate complexing agent with mole number as 1.6-3.2 times to the aluminum nitrate; heating and evaporizing the solution in water bath at 60-90Deg; adding nitric acid to control solution pH value between 4 and 7; mixing continually to form gel; combusting the gel slowly at 200-280Deg to obtain the precursor powder; calcining the powder at 800-1200Deg to obtain the product.

Description

technical field [0001] The present invention is related to luminescence, and relates to fluorescent materials, especially a garnet-type yellow fluorescent material Y 3 Al 5 o 12 : Preparation method of Ce, Li. The fluorescent material can be used for semiconductor white light emitting diode lighting, and can also be used for other display and lighting. technical background [0002] In 1998, Nichia successfully developed white light-emitting diodes (LEDs), which made the application of LEDs take a substantial step from the simple sign display function to the lighting function. Compared with traditional light sources, LED light sources have the following advantages: ultra-long life, up to tens of thousands of hours, which is significantly higher than the thousands of hours of traditional light sources; strong structure, no easily damaged parts such as tungsten filaments and glass bulbs, and extremely High shock resistance; fast response, short luminous flux rise time; low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
Inventor 周圣明夏国栋徐军张俊计
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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