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Fluorescent ceramic for warm white light illumination and preparation method thereof

A fluorescent ceramic and warm white light technology, which is applied in the chemical industry, can solve the problems of high equipment and environmental requirements, complicated preparation conditions, and reduced light extraction efficiency, and achieve good consistency, high controllability, and uniform ion distribution.

Pending Publication Date: 2020-12-25
贵州赛义光电科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, vacuum sintering is often used to prepare fluorescent ceramics. Vacuum sintering has high requirements on equipment and environment, and is not conducive to large-scale industrial production.
For the adjustment of the spectrum, the commonly used method on the market is to add fluoride and nitride red powder. Fluoride nitride is not only more complicated than oxide phosphors in terms of preparation conditions, but also the added red powder will reduce the light extraction efficiency by self-absorbing the spectrum, so that affect the luminous intensity

Method used

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  • Fluorescent ceramic for warm white light illumination and preparation method thereof
  • Fluorescent ceramic for warm white light illumination and preparation method thereof
  • Fluorescent ceramic for warm white light illumination and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Terbium oxide (chemical formula: Tb 4 o 7 ), alumina (chemical formula: Al 2 o 3 ), silicon dioxide (chemical formula: SiO 2 ), cerium oxide (chemical formula: CeO 2 ) and manganese dioxide (chemical formula: MnO 2 ) as raw material, take terbium oxide 209272g, aluminum oxide 9.5038g, silicon dioxide 0.0112g, cerium dioxide 0.0019g, manganese dioxide 0.0162g. The raw materials were mixed by ball milling in 18ml of absolute alcohol, wherein 90g of agate balls were added to the ball mill jar to assist in mixing evenly. The mixed slurry was ball milled at a speed of 250 r / min for 12 hours at room temperature.

[0040] After the ball milling was stopped, the slurry was dried in a drying oven at 80° C. for 12 hours to obtain a dried powder, and the dried powder was sieved with a 200-mesh nylon mesh to obtain a fine powder. Put the fine powder into a crucible and burn it in a muffle furnace at 850°C for 5 hours.

[0041] Put the bisque-fired powder into a metal film w...

Embodiment 2

[0049] The method for preparing fluorescent ceramic material in embodiment 2 is basically the same as that of example 1, and the raw materials taken are all terbium oxide, aluminum oxide, silicon dioxide, cerium dioxide and manganese dioxide, and the difference is that Mn 2+ , Si 4+ Relative to Al 3+ The doping amount is 0.015.

[0050] The phase composition of the obtained fluorescent ceramics is detected by X-ray diffractometer, and the phase of the obtained fluorescent ceramics is still a cubic garnet phase according to the test result data, and the XRD spectrum is as follows Image 6 shown.

[0051] Using a fluorescence spectrometer, test the fluorescence spectrum of the fluorescent material prepared in this embodiment under the excitation of 460nm blue light, the test results are as follows Figure 7 shown. A broadband light emission with a peak value of 585nm and a full width at half maximum of 134nm was obtained.

[0052] Using integrating sphere equipment, the ele...

Embodiment 3

[0054] The method for preparing fluorescent ceramic material in embodiment 3 is basically the same as that of example 1, and the raw materials taken are all terbium oxide, aluminum oxide, silicon dioxide, cerium dioxide and manganese dioxide, and the difference is that Mn 2+ , Si 4+ Relative to Al 3+ The doping amount is 0.025.

[0055] The phase composition of the obtained fluorescent ceramics is detected by X-ray diffractometer, and the phase of the obtained fluorescent ceramics is still a cubic garnet phase according to the test result data, and the XRD spectrum is as follows Figure 9 shown.

[0056] Using a fluorescence spectrometer, test the fluorescence spectrum of the fluorescent material prepared in this embodiment under the excitation of 460nm blue light, the test results are as follows Figure 10 shown. A broadband light emission with a peak at 590nm and a full width at half maximum of 132nm was obtained.

[0057] Using integrating sphere equipment, the electro...

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Abstract

The invention provides fluorescent ceramic for warm white light illumination and a preparation method thereof. The chemical formula of the fluorescent material is Tb3 (1-x) Ce3xAl5 (1-2y) Mn5ySi5yO12,x is larger than or equal to 0.00005 and smaller than or equal to 0.15, y is larger than or equal to 0.00005 and smaller than or equal to 0.3, and the preparation method of the fluorescent ceramic comprises the steps that terbium oxide, aluminum oxide, cerium oxide, silicon dioxide and manganese dioxide are proportioned according to the chemical formula Tb3 (1-x) Ce3xAl5 (1-2y) Mn5ySi5yO12, powder prepared according to the stoichiometric ratio is mixed and then pressed and formed, a pressed green body is subjected to a phase change reaction through heat treatment to generate fluorescent ceramic of a terbium aluminum garnet phase, Ce < 3 + > ions and Mn < 2 + > ions enter a terbium aluminum garnet structure through diffusion under the high-temperature condition and replace existing Tb < 3+ > ions and Al < 3 + > ions respectively to form a light-emitting center; the Ce < 3 + > and Mn < 2 + > ion co-activated terbium aluminum garnet phase fluorescent ceramic for warm white light illumination is obtained. The fluorescent ceramic has wide-band yellow-green-orange-red fluorescence emission under blue light excitation, the fluorescence peak wavelength can be adjusted along with the concentration of doped Ce < 3 + > and Mn < 2 + >, and the fluorescent ceramic is suitable for warm white light illumination.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a fluorescent material and a preparation method thereof, in particular to a terbium aluminum garnet phase fluorescent ceramic for warm white lighting and a preparation method thereof. Background technique [0002] At present, white light LED has gradually become the main light source in the field of lighting and display because of its advantages of high efficiency, energy saving, environmental protection and long service life. There are basically two ways to synthesize white light LEDs. One is to synthesize red, green and blue three-color white light LEDs. Different conditions, the design is relatively complex. Therefore, the widely used white light LED synthesis scheme is the fluorescence conversion type, and the Ce is excited by the blue light chip. 3+ : YAG yellow phosphor. [0003] However, commonly used commercial Ce 3+ : Insufficient red light component in the spectrum of...

Claims

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Application Information

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IPC IPC(8): C04B35/44C04B35/50C04B35/622H01L33/50C09K11/80
CPCC04B35/44C04B35/50C04B35/622C09K11/7774H01L33/502C04B2235/3229C04B2235/3224C04B2235/3217C04B2235/3262C04B2235/3418C04B2235/9646Y02B20/00
Inventor 林辉段与同李宇焜胡健蒋顺攀李席安张朴
Owner 贵州赛义光电科技有限公司
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