1. Quantum Dots: These are nanoscale semiconductor particles that can produce different colors based on their size. They are used in quantum dot displays and lighting. 2. Carbon Nanotubes: These are cylindrical nanostructures with exceptional electrical and thermal properties, useful in enhancing the performance of OLEDs. 3. Nanophosphors: These are phosphorescent materials at the nanoscale, used to convert light into different colors with high efficiency. 4. Plasmonic Nanoparticles: These nanoparticles can enhance light-matter interactions, making them useful in sensors and advanced lighting applications.