Cadmium-Free Quantum Dots for Low Energy Displays
The aesthetic benefits of cadmium-free quantum dots are well documented, with demonstrably a wider color gamut resulting in vibrant, ultra-high definition (UHD) displays. Cesium lead halide (CsPbX3) perovskite quantum dots have received significant attention for their outstanding optical characteristics with respect to their quantum yield of up to 99% and full width at half maximum (FWHM) of less than 25 nanometers (nm).
Perovskite quantum dots can already be integrated into existing liquid crystal display (LCD) matrices using blue light-emitting diode (LED) backlights. A substrate of quantum dots is integrated into this arrangement.
These properties have been explored in extensive detail, but there are also significant energy-consumption benefits associated with the use of cadmium-free quantum dots. This blog post will explore the potential use of cesium lead halide perovskite quantum dots as a pixelated color conversion layer in cheaper, lower-energy displays with outstanding optical properties:
Pixelated Color Conversion Using Quantum Dots
The proposed methodology for manufacturing a cesium lead halide quantum dot pixelated color conversion layer for lower-energy displays is based on existing optical absorption data. Current color converter technology wastes significant amounts of energy due to weaker absorption and lower quantum yield. The cascade of lower absorption and lower quantum yield results in a high degree of inefficiency.
Red and green quantum dots can be applied to a substrate and integrated into an LCD matrix. This architecture relies on the production of blue light from a bank of LEDs, a layer of photo emissive nanocrystals, or an OLED source. The light emitted excites the layer of perovskite quantum dots and allows individual pixels to fluoresce their respective colors with rates of up to 99% conversion at layer thicknesses of just 5-10 microns.
This technology has generated excitement in the display sector. Energy wastage is a significant concern for manufacturers and consumers, with the ever-improving capacities of modern display technology requiring a proportional increase in energy demands.
Perovskite quantum dot color converters have the potential to negate the loss of energy. All light generated by the LED backlight would be transmitted and utilized on-screen, negating electricity wastage due to optical attenuation. Experts estimate that this technology could improve the energy efficiency of modern displays by up to two thirds.
Perovskite Quantum Dots from Avantama
At Avantama, we have been developing unique nanomaterials for advanced electronics for many years, providing custom nanoparticle formulations for clients in numerous sectors. If you would like any more information about the quantum dot products available from Avantama, please do not hesitate to contact us.