High Refractive Index Materials for Optoelectronics

A refractive index is an indicator of how different frequencies and wavelengths of light propagate through transparent materials. Rates of refraction, reflection, and attenuation are considered when calculating the refractive index of transparent media, which generally falls between 1 – 2 n.

Innovations in photonic technology such as the commonly used light-emitting diodes (LEDs) and organic light-emitting diodes (OLEDs) have advanced alongside our understanding of the nature of light as it travels through different mediums.

A high refractive index material is generally defined as a treated glass, polymer, or chemical coating possessing a refractive index of >1.50. High refractive index materials are often combined with materials of contrasting refractivity to create transparent components with anti-reflective properties.

Applications of High Refractive Index Materials

High refractive index materials are progressively dominant in optoelectronics. Their main use is for enhancing the visual properties of electronic displays, which includes LCDs, OLEDs, and quantum dot (QDLED) televisions.

All of these technologies rely on the propagation of light through a series of filters and a glass or plastic panel. The maximum amount of light must be able to be transmitted from the diodes inside the device to make sure high-quality images are produced on-screen.

Mobile devices from smartphones to tablets need to be able to function well in a wide range of conditions. The level of performance also cannot drop in demanding scenarios; for example, consumers want mobile devices that can keep their excellent optical properties in direct sunlight so they can be used easily outside. To achieve this, these devices require anti-reflective materials to alleviate glare and guarantee they operate well in bright conditions.

Avantama has developed a range of finely tuned nanodispersions utilizing high refractive index materials for optical thin film processing applications. End-products possess high anti-reflectivity levels to diminish glare and improve their everyday practical use. LCD anti-reflection coatings are available for thin film electronic deposition printing processes. OLED out-coupling coatings are also available up to the maximum refractive index of 1.95.

While the chief use for anti-reflection materials is to lessen glare across varying components, the solar energy sector also has a great need for the increase in light attenuation or absorption.

Organic photovoltaic cells (OPCs) are solution-processed solar panels that benefit from anti-reflectivity by making full use of the amount of light being absorbed and processed. Normally, solar cells could reflect as much as 30% of the light they are exposed to, which significantly reduces a unit’s potential energy capacity. OPCs made using high reflective index materials are vital for supplying the world’s ever-increasing energy demands.

High Refractive Index Products from Avantama

Avantama is a leading developer of nanoparticles and solutions for use in some of the world’s most dynamic, cutting-edge sectors. Our thin film deposition chemicals and nanoparticles have been processed with successful results for the aerospace, electronics, and energy industries. We continue to develop a range of high refractive index nanograde materials with potentially limitless applications.

If you need more information about our high refractive index materials, contact us.

This information has been sourced, reviewed and adapted from materials provided by Avantama AG.

For more information on this source, please visit Avantama AG.


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