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Carbon-doped yttrium aluminium garnet crystal and two-step preparation method thereof

A technology for yttrium aluminum garnet and crystal, which is applied in the field of carbon-doped yttrium aluminum garnet crystal and its two-step preparation, can solve the problems of easy volatilization of carbon, influence on crystal stability, inability to obtain, etc., and achieve high thermoluminescence sensitivity and Optical luminescence sensitivity, improved performance, the effect of avoiding volatilization

Active Publication Date: 2009-12-16
中山昂腾光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For carbon-doped garnet (YAG:C) crystals, due to the fact that carbon is easy to volatilize at high temperatures, it is impossible to obtain high carbon-doped and uniformly doped YAG:C crystals using traditional processes, which limits the thermoluminescence and optical properties of the crystals. Luminescent dosimetry properties, seriously affecting the stability of crystals

Method used

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  • Carbon-doped yttrium aluminium garnet crystal and two-step preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 2.5 mol or 255 grams of α-Al respectively 2 o 3 , 1.5mol or 338.7 grams of Y 2 o 3 , mixed and ground on a planetary ball mill for 24 hours, taken out and then cold-dried and pressed into shape for later use. The temperature gradient method is used to grow YAG crystals, and pure YAG in the [111] direction is selected as the seed crystal; the temperature gradient in the growth area is 30K / cm; after the furnace is installed, the vacuum is pumped to the furnace pressure -3 Pa, continue to heat up to 2253K, keep the temperature for 0.5h after the raw material is melted, and cool down at a cooling rate of 3K / h. The melt starts to slowly crystallize from the seed crystal, continue to cool down until the melt is completely crystallized, and then cool down to room temperature at a rate of 40K , open the furnace hood, and take out the crystals.

[0029] Colorless and transparent YAG crystals were grown without obvious inclusions and bubbles. Several wafers of 5 x 5 x 1...

Embodiment 2

[0033] Weigh 2.5 mol or 255 grams of α-Al respectively 2 o 3 , 1.5mol or 338.7 grams of Y 2 o 3 , mixed and ground on a planetary ball mill for 24 hours, taken out and then cold-dried and pressed into shape for later use. The temperature gradient method is used to grow YAG crystals, and pure YAG in the [111] direction is selected as the seed crystal; the temperature gradient in the growth area is about 40K / cm; -3 Pa, continue to heat up to 2253K, keep the temperature for 2 hours after the raw material is melted, and cool down at a cooling rate of 3K / h. The melt starts to slowly crystallize from the seed crystal, continue to cool down until the melt is completely crystallized, and then cool down to room temperature at a rate of 70K. Open the furnace hood and remove the crystals.

[0034] Colorless and transparent YAG crystals were grown without obvious inclusions and bubbles. Several wafers of 5 x 5 x 1 mm were cut in the crystal along the [111] direction. Put 100g of hig...

Embodiment 3

[0037] The preparation method of YAG crystal is the same as that in Example 1.

[0038]Cut several 5×5×5 mm wafers in the prepared YAG crystal along the [111] direction. Put 100g of carbon powder at the bottom of the crucible, place the YAG wafer on a support with holes in the crucible, and cover the crucible lid.

[0039] Install the furnace, vacuumize until the furnace pressure -3 Pa, continue to heat up to 2000K, and carry out carburizing treatment on the YAG wafer at constant temperature for 40 hours. The treatment process is carried out in a hydrogen reducing atmosphere, and then cooled to room temperature at a rate of 70K, and the furnace cover is opened to take out the crystal. The carbon doping amount in the crystal can be measured by glow discharge mass spectrometry, and the result shows that the carbon doping amount in the crystal is about 2000ppm.

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Abstract

The invention relates to the technical field of laser crystal and discloses a carbon-doped yttrium aluminium garnet crystal and a two-step preparation method thereof. The carbon-doped yttrium aluminium garnet crystal is prepared by doping carbon in the yttrium aluminium garnet crystal. The invention also discloses the preparation method of the crystal, comprising the following steps: processing pure YAG crystal into YAG crystal plates, then adopting high-purity carbon as an evaporation source to carry out diffusion and carburization treatment to the pure YAG crystal plates and obtaining the carbon-doped yttrium aluminium garnet crystal. The invention adopts high-purity carbon as the evaporation source to carry out diffusion and carburization treatment to the pure YAG crystal plates, and can avoid the volatilization of carbon in the process of the preparation. The preparation method is characterized by simpleness and high efficiency. The carbon-doped YAG crystal has high thermoluminescent and photoluminescent sensibility and has potential application value in the field of the thermoluminescent or photoluminescent dosimetry.

Description

technical field [0001] The invention belongs to the field of laser crystals, in particular to a carbon-doped yttrium aluminum garnet crystal and its two-step preparation method. Background technique [0002] The mineral name of YAG crystal is carbon-doped yttrium aluminum garnet, and the molecular formula is Y 3 Al 5 o 12 . YAG crystal has excellent physical, chemical and optical properties, and is a very important substrate, window and matrix material. Nd-doped YAG crystal (Nd:YAG) is currently the most widely used laser crystal; Ce-doped YAG crystal is a scintillation material with excellent performance of high light output and fast decay; Yb-doped YAG crystal is ideal for diode-pumped all-solid-state lasers medium. However, there is no relevant report on carbon-doped yttrium aluminum garnet crystals in China at present. [0003] The melting point of YAG crystal is ~1970°C, which belongs to high-temperature oxide crystal, and it is difficult to grow. At present, the...

Claims

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Application Information

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IPC IPC(8): C30B29/28C30B11/00C30B31/06
Inventor 李红军杨新波徐军苏良碧
Owner 中山昂腾光电科技有限公司
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