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Aluminum gallate-based fluorescent material and preparation method thereof

A fluorescent material, aluminum gallate technology, applied in the field of aluminum gallate-based fluorescent materials and its preparation, can solve the problems of low production efficiency, emission spectrum drift, harsh synthesis conditions, etc.

Active Publication Date: 2016-07-20
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, it is worth noting that, usually, the three primary color luminescent materials use different substrates. When experiencing light decay, the emission spectrum will drift, resulting in unstable light color.
Moreover, both of the above solutions require the addition of luminescent materials that produce red and green emissions with consistent luminosity
At present, the widely used red light materials that can be effectively excited by ultraviolet or blue light are mainly Eu 2+ Activated nitride luminescent materials [Mater.Res.Bull, 1996, 31, 1355], the red light emission of this kind of luminescent materials is mostly in the range of 600nm ~ 630nm, and can be combined with other phosphor materials to form white LEDs, but this Material synthesis conditions are harsh, production efficiency is low, and overall cost is high

Method used

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  • Aluminum gallate-based fluorescent material and preparation method thereof
  • Aluminum gallate-based fluorescent material and preparation method thereof
  • Aluminum gallate-based fluorescent material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The chemical formula of the aluminum gallate-based green fluorescent material prepared in this example is: Ca 0.97 AlGaO 4 :0.03Tb 3+ .

[0034] Weigh raw material CaCO 3 1.9612g, Al 2 o 3 1.0196g, Ga 2 o 3 1.8744g and Tb 4 o 7 Put 0.1120g into an agate mortar, grind it sufficiently to pulverize and mix evenly to obtain a mixture, then put the mixture into a corundum crucible, place it in a tube furnace for calcination, keep it at 1250°C for 8 hours, and heat up The rate is 2-10°C / min, and the entire calcination process is carried out in an air atmosphere. After the heat preservation is completed, it is cooled to room temperature, and then taken out and ground until the particle size reaches 3-60 μm to obtain a finished aluminum gallate-based green fluorescent material.

[0035] From figure 2 It can be seen that the excitation peak of the aluminum gallate-based green fluorescent material prepared in this example is located at 230nm-500nm, and its main excitat...

Embodiment 2

[0038] The chemical formula of the aluminum gallate-based red fluorescent material prepared in this example is: Ca 0.97 AlGaO 4 :0.03Eu 3+ .

[0039] Weigh raw material CaCO3 1.9612g, Al 2 o 3 1.0196g, Ga 2 o 3 1.8744g and Eu 2 o 3 Put 0.1055g into an agate mortar, grind it sufficiently to pulverize and mix evenly to obtain a mixture, then put the mixture into a corundum crucible, place it in a tube furnace for calcination, and keep it at 1400°C for 5 hours, the heating rate The temperature is 2-10°C / min. The whole calcination process is carried out in a weak oxidizing atmosphere. After the heat preservation is completed, it is cooled to room temperature, and then it is taken out and ground until the particle size reaches 3-60 μm, and the finished product of aluminum gallate-based red fluorescent material is obtained.

[0040] From Figure 4 It can be seen that the excitation peak of the alumino-gallate-based red fluorescent material prepared in this example is locate...

Embodiment 3

[0043] The chemical formula of the aluminum gallate-based orange fluorescent material prepared in this example is: Ca 0.97 AlGaO 4 :0.03Sm 3+ .

[0044] Weigh raw material CaCO 3 1.9612g, Al 2 o 3 1.0196g, Ga 2 o 3 1.8744g and Sm 2 o 3 Put 0.1051g into an agate mortar, grind it sufficiently to pulverize and mix it evenly to obtain a mixture, then put the mixture into a corundum crucible, place it in a tube furnace for calcination, and keep it at 1350°C for 7 hours, the heating rate The temperature is 2-10°C / min, and the whole calcination process is carried out in an air atmosphere. After the heat preservation is completed, it is cooled to room temperature, and then taken out and ground until the particle size reaches 3-60 μm, and the finished product of alumino-gallate-based orange fluorescent material is obtained.

[0045] From Figure 6 It can be seen that the excitation peak of the alumino-gallate-based orange fluorescent material prepared in this example is locat...

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Abstract

The invention discloses an aluminum gallate-based fluorescent material. The aluminum gallate-based fluorescent material adopts a chemical formula of M1-xAlyGazO4:xRE, wherein M is at least one of Ca (calcium), Sr (strontium) and Mg (magnesium); RE is at least one of Eu3+ (europium), Sm3+ (samarium) and Tb3+ (terbium); x, y and z are atom molar ratios of the elements in material composition, x is greater than 0 and is smaller than 0.15, y is greater than or equal to 0.8 and is smaller than or equal to 1.2, and z is greater than or equal to 0.8 and is smaller than or equal to 1.2. When Eu3+, Sm3+ and Tb3+ are singly doped, the obtained red fluorescent material, orange fluorescent material and green fluorescent material can be respectively excited at high efficiency in the 300-500nm waveband, and can be well matched with ultraviolet, near-ultraviolet chips or blue light chips. The aluminum gallate-based fluorescent material has the advantages that by adopting the same matrix material, the broadband multi-color emitting in the 500-700nm waveband can be realized, the wavebands of blue-green light, green light, orange light and red light are covered, the problem of instable light color caused by different attenuation rates of multiple matrixes in the same LED (light emitting diode) device is solved, and the light color stability and color rendering property of the LED are improved.

Description

technical field [0001] The invention relates to the field of fluorescent materials, in particular to an aluminum gallate-based fluorescent material and a preparation method thereof. Background technique [0002] As a new generation of lighting source, white LEDs have attracted more and more attention. Currently, the most widely used white LED implementation method in the market is to use blue chips to stimulate Y 3 al 5 o 12 : Ce 3+ (YAG:Ce 3+ ) The yellow light emitted by the phosphor is recombined with the incompletely absorbed blue light to form white light. However, the emission band of this white LED lacks a red portion, resulting in a low color rendering index and a high color temperature, which makes it difficult to achieve ideal lighting effects, and is not suitable for occasions with high color rendering performance. [0003] In order to improve the color rendering of white LEDs, a more effective solution is to use ultraviolet or blue LED chips to stimulate the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64
CPCC09K11/7728C09K11/7743C09K11/7759C09K11/7783
Inventor 周如龙王枞王雷屈冰雁张博
Owner HEFEI UNIV OF TECH
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