Sapphire window panels are often used as window materials because they are highly transparent to light between wavelengths of 150 nanometers (ultraviolet) and 5500 nanometers (infrared) (visible spectrum range from about 380 nanometers to 750 nanometers), and have high scratch resistance, high compressive strength, and high melting point. They are suitable for special applications such as high pressure, vacuum, or corrosive atmospheres, and can resist strong acid corrosion due to their high dielectric constant. Meanwhile, sapphire can also resist darkening caused by ultraviolet radiation.

Sapphire is widely used in multiple fields, including but not limited to the following aspects:

1. In the field of optics, it has excellent optical performance and is used to manufacture optical windows, lenses, laser output windows, optical prisms, and filters.

2. Semiconductor industry: commonly used for epitaxial growth of semiconductor materials such as GaN (gallium nitride), and for manufacturing LEDs (light emitting diodes) and laser diodes.

3. Sapphire crystal oscillator: With stable mechanical properties and high quality factor, it is widely used in the manufacturing of oscillators, resonators, and clocks.

4. Watches and Timepieces: Sapphire window panels are used to manufacture watch dials and cases due to their high hardness and scratch resistance, thereby protecting the surface from damage.

5. Scientific research: used for manufacturing laboratory instruments and windows, such as laser experiments, high-voltage experiments, and optical research.

6. Windows and coverings: They are used for windows and coverings in aerospace, chemical, and other industrial sectors due to their corrosion resistance and high mechanical strength in various harsh environments.

Sapphire window panels not only have excellent electrical insulation properties, but also high thermal conductivity, making them an ideal substrate material for manufacturing high brightness and high-power LEDs. In addition, it can also be used to manufacture optical windows, mechanical components, etc., with broad application prospects in both the optical and other fields.