Vertical and Horizontal Temperature Gradient Cooling Method

Vertical and horizontal temperature gradient cooling (Vertical Horizontal

Gradient Freezing;VHGF) method, mass production LED sapphire crystal rod

LED sapphire crystal rod

, this technology is based on the vertical temperature gradient cooling (Vertical Gradient Freezing; VGF) method based on the use of VGF Growth of GaAs crystal rods , low potential density can reach high quality ingot . Divided by the VGF method is based outside , STC adopted VHGF Act is combined horizontal temperature gradient in the cooling process , this way , can make long grain size (diameter and height ) and long grain shape is relatively unrestricted . All in all , the temperature gradient method (TGT), Bridgman (VGF) and the vertical and horizontal temperature gradient cooling method (VHGF) are taking different approaches to change the hot zone temperature gradient to grow sapphire crystals, however , VHGF France STC companies in Korea patents, the specific methods adopted to change the crystal growth temperature gradient is unknown. Another corundum , Fujian Xin Jing Precision Technology Co., Ltd. developed the " top-seeded vertical temperature gradient method " technology ( temperature gradient in the crucible seed is lower ) , is also an approach of this kind .

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