This white paper discusses the combination of best-of-class materials in order to achieve high-quality composites showing a remarkable aging stability. The blue-light stability and the achievable refractive indices are reported.
Hansen Solubility Parameters are a quantifiable measure of compatibility that aid in the optimization of formulations for a variety of applications. The HSP values have been determined for Pixelligent’s PixClear® PCPR zirconia nanocrystals. From these tests, PixClear® is shown to have excellent compatibility with a broad range of components that may be used in complex formulations.
The application of Pixelligent’s PixClear® high-refractive index (> 1.7) zirconia nanocomposite films onto glass substrates by way of inkjet printing is discussed in this white paper. Two formulations are highlighted within: one formulation for optically clear films, and the other for OLED lighting internal extraction layers (IEL).
There are many opportunities to increase the brightness and efficiency of OLED displays. In this white paper we describe how Pixelligent's solution processable high refractive index zirconia materials can be used to create extraction structures for display applications
In this paper the Abbe numbers of Pixelligent zirconia nanocrystal containing composites were determined for two acrylic and two silicone based polymer systems. The effect of nanocrystal loading on transparency and Abbe number are examined and compared to similar materials from literature.
The surface resistivity, volume resistivity, and dielectric strength of Pixelligent zirconia nanocrystal/acrylic composites was measured in this study. Native bisphenol A glycerolate dimethacrylate (BPA) was measured as the reference medium, and PixClear PCPR nanocomposites were tested at 50wt% and 90wt% in the same polymer system.
Pixelligent’s zirconia-silicone nanocomposite materials deliver up to 7% lumen output increase to packaged LEDs over a standard methyl silicone alone in a YAG-based phosphor layer. The nanocomposite combines the benefit of high-refractive index without the need for phenyl functional groups in a silicone system and is designed for use in either spray or dispense processes. Lumen efficiency gains over a standard methyl silicone and lumen equivalence compared to a methyl phenyl silicone can be achieved with a conventional LED chip architecture, a dispensable single phosphor-silicone mixture and a hemispherical lens.
Pixelligent has successfully developed a complete internal light extraction layer (ILE) for OLED lighting applications based on titania scatterers and Pixelligent’s zirconia nanodispersions. This high-refractive index layer increases light output and can be applied with slot-die coating to provide customers with a single process for an ILE with integrated scatters. The slot-die coating technique is a scalable and low-cost process suitable for large size manufacturing.
Pixelligent’s transparent ZrO2 nanocrystal/polymer nanocomposite provides a new class of high dielectric constant material that can be applied to many novel applications. Because of our proprietary surface capping technology, the nanocrystals can be incorporated into the polymer up to 80 wt% loading, corresponding to a dielectric constant of 8, without losing optical transparency and processability.
Pixelligent’s zirconia nanocrystals in commercial silicone LED encapsulants result in high quality zirconia/silicone nanocomposites. The zirconia/silicone nanocomposites have the potential to deliver improved LED performance and reliability. This white paper discusses experimental results demonstrating the ability of silicone compatible nanocrystals to deliver higher refractive indices while maintaining optical clarity and thermal stability of the base silicones.
Although Organic Light Emitting Devices (OLED) have a great promise of providing a novel and highly energy efficient form of general lighting, one of the main barriers to their commercial adoption is the poor extraction efficiency of the light produced in the device. At the heart of this problem is the refractive index mismatch and almost all internal light extraction scheme requires a high refractive index material