Indium tin oxide (ITO) is one of the most important transparent, electrically conductive materials. And ITO coating has superior conductivity and transparency and stability, it is mainly used to coat semiconductor sensor wirings and manufacture diverse electro-optical components and devices such as organic light-emitting diodes (OLEDs) and touchscreens. ITO could also be coated on glass as shielding window, the shielding effect of thin film coatings is due to reflection of the electromagnetic wave. In addition, it could be used as transparent heating glass in de-icing systems, heatable object slides or hot states.
ITO coated windows are mainly applied for:
- EMI/RFI shielding
- Touch screen technology
- Electrodes for LCD
- ESD (protection against electro static discharge)
- Electrochromic displays
- Energy conserving windows
- heated optical filters for displays
- Active components for touch-screens
- Aircraft windshields
- Gas sensors
Antireflection possibilities with plastic and glass substrates
- Multi-layer coating according to MIL SPEC 675 B (less than 0,6% rest of reflection)
- Single-layer coating according to DIN 58197 (less than 1,5% rest of reflection)Chemical etching (very diffuse)
- Anti-scratch, anti-reflection coating by spraying
The ITO coating can be sputtered onto glass or plastic and has good chemical and mechanical durability, it will also not oxidise when exposed to air. Thin layers of about 200 nm are transparent in the area of visible light while infrared light is reflected. The picture as below is the transmission vs electronic impedance, thickness, tested @ shapeoptics coating lab.
Indium tin oxide (ITO) has a density of approximately 7 g/cm³ and a white to yellowish color. The oxygen content of the coating is adjusted to a compromise point, giving good optical transparency and low impedance, normally between 10 – 40 Ohms / square for shielding. Performance of an ITO window will depend on its impedance and the field impedance, but generally will produce between 80 and 120 dB attenuation in the E – Field, and around 20 dB for Plane waves.
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