Sapphire Technology Co., Ltd.

Bok Kee Na

Sung Hwan Moon

Hee Choon Lee

Yi Sik Choi

Gye Won Jang

Provided is a sapphire single crystal heat treatment method comprising the steps of: charging a sapphire single crystal into a chamber; raising the temperature in the chamber to a target temperature by heating the chamber; holding the temperature in the chamber at a constant temperature; and cooling the inside of the chamber to room temperature, wherein the temperature raising step comprises: a first temperature raising step of raising the temperature to a first set temperature at a temperature raising rate of 4&#xb0; C./min to 5&#xb0; C./min; and a second temperature raising step of raising the temperature to a second set temperature at a temperature raising rate of 1&#xb0; C./min or less after the first temperature raising step has been completed. The temperature raising process is executed in a multi-stage, to reduce the temperature raising time and prevent a sapphire single crystal from being affected by heat.

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Hwaseong-si, South Korea

Bok Kee Na