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ITO coating: Transparent, conductive, and versatile
Indium tin oxide (ITO) combines electrical conductivity with optical transparency. This makes ITO coatings ideal for demanding technical applications.
Indium tin oxide (ITO) enables transparent and electrically conductive coatings on glass and plastics. It is primarily used to make surfaces conductive without impairing light transmission in the visible range. In addition, ITO reflects infrared radiation and is suitable for applications such as ESD protection, heating resistors, displays, and optical coating systems. ITO coatings enable electrically heated surfaces, protect against static charge, shield electromagnetic radiation, and can fulfill specific optical properties. Supplementary coatings such as silicon dioxide can further improve functionality, for example through electrical insulation or protection against chemical influences. The transparent, electrically conductive coatings are used in particular in military and display technology as well as in the electrical industry.
Areas of application for ITO coatings
The main aspect of indium tin oxide (ITO) coatings is to create an electrically conductive surface with high transparency in the visible spectral range. Due to the semiconductor properties of this material, ITO is also suitable for reflecting long-wave IR radiation. Indium tin oxide can also be used to prevent static charges (ESD), as a heating resistor, or for contacting electrical panels. In addition, the ITO coating reflects infrared radiation. ITO layers are also suitable for the electrical activation of liquid crystals in microdisplays.
If required, we can also apply a passivation layer of silicon dioxide SiO2 before coating with ITO. This very thin layer applied between the glass substrate and the ITO coating increases electrical insulation. The layer also serves as protection, for example in LCD display applications, so that alkali oxides from the glass cannot pass into liquid crystals.
ITO can also be integrated into optical coating systems. For example, ITO coatings can be supplemented with anti-reflective coatings to achieve additional properties such as reduced reflection and increased image contrast. ITO can also be used as an overcoat or covering layer.
Advantages of coatings with ITO (indium tin oxide)
- Coating of indium, oxygen and tin (indium oxide / In2O3 and tin oxide / SnO2)
- Transparent, conductive layers
- Avoidance of static charges (ESD)
- High transmission in the visible and near infrared range
- High reflection in the infrared spectrum from approx. 1500 nm (can be increased by additional layers if required)
- High stability against environmental influences and temperature
- Very low specific resistance
- Antistatic and temperature resistant, ideal for ESD protection and heating applications
- Very low specific resistance
- ITO coatings can be contacted
- Coating of ITO-coated substrates according to customer specifications and with dimensions as required (up to 550 x 550 mm)
- Substrates that we coat with ITO: Glass, polycarbonate, possibly other plastics
- Application to flexible substrates possible
- Can be used in a layered system with other optical layers (AR, beam splitter mirror)
- Can be used for X-ray absorption
Typical applications of ITO-coatings
- Contacting electrical panels
- Optically permeable heating glass (e.g. for applications in oven interiors)
- Display technology (screens, micro-displays)
- Wafers
- X-ray applications / X-ray dosimetry
- Electromagnetically shielded windows or touchscreens in vehicles, EMI window
- EMC shielding / EMI shielding
- ESD coating
- Electroluminescent displays
- Microscopy
- ITO-coated microscope slides
- Heating applications / electrically heatable components
- Heating resistor
- Heating window
- Antistatic applications
FAQ about ITO Coatings
ITO stands for indium tin oxide. It is a transparent and electrically conductive layer that is used in technical applications such as displays, heating glass, and ESD protection.
Thanks to its semiconductor properties, ITO enables high transmission in the visible range and electrical conductivity at the same time. This makes ITO coating ideal for optoelectronic applications.
It offers antistatic properties, high temperature resistance, low electrical resistance, infrared reflection, and is stable against environmental influences.
Typically on glass and polycarbonate, but also on other plastics and flexible substrates, depending on customer requirements.
The coating can be applied to substrates with an edge length of up to approx. 600 mm. For special customer-specific applications, edge lengths of approx. 900 mm are also possible.
The thickness of the ITO layer depends on the required electrical surface resistance and the respective application. Typically, the layer thickness is between approx. 10 and 300 nm.
ITO coatings are used in a variety of industries. For example, ITO coatings are used in microscopy for ESD purposes, in display technology for contacting, and in defense and space applications for EMC shielding.
Yes, ITO reflects long-wave infrared radiation from around 1500 nm. In MWIR and LWIR, reflections of >90% are possible.
Yes, ITO layers can be contacted and are therefore suitable for electrical applications such as heating resistors or panels.
ITO enables the electrical activation of liquid crystals in microdisplays and provides transparent, conductive surfaces in screens and display windows.
It increases electrical insulation and, in LCD applications for example, prevents alkali oxides from the glass from migrating into liquid crystals.
