Nanosys Inc. has been awarded $2,000,001 to develop quantum dot technology for solid-state lighting, addressing limitations of current cadmium-based materials. The project, a collaboration with University of California, Merced, will focus on creating heavy-metal-free quantum dots capable of maintaining performance under demanding conditions for high-performance LEDs, specifically temperatures up to 150°C and a light flux of 1 W/mm². Nanosys, a leading supplier of quantum dots to the display industry, intends to apply its expertise to this new application, potentially expanding the use of quantum dots beyond displays. The goal is to create non-toxic quantum dot materials that maintain functionality for the entire lifespan of an LED, prioritizing structural attributes that improve performance and increase lifetime under these conditions.
Cadmium-Free Quantum Dot Synthesis for Solid State Lighting
Nanosys Inc. and University of California, Merced are collaborating on a $2,000,001 project funded by the Department of Energy to address a critical limitation in solid-state lighting: current quantum dot technology relies heavily on cadmium, a toxic material subject to increasing regulation. This research, scheduled from April 1 to December 31, seeks to develop heavy-metal-free quantum dots capable of functioning as efficient down-converters in LED environments, absorbing high-energy light and re-emitting it at lower wavelengths to produce white light. Researchers aim to achieve a 100-fold increase in quantum dot lifetime under these stresses, prioritizing structural attributes that enhance both performance and longevity. According to project documentation, “The goal for lifetime increase is 100-fold,” with the ultimate objective being a non-toxic, durable material that matches the lifespan of the LED itself. Characterization of these heavy-metal-free quantum dots will focus on both structural and photophysical properties, informing strategies to optimize material performance under operational conditions, and the resulting materials are intended to significantly improve LED efficiency and color quality without introducing hazardous substances into lighting systems.
High-Flux, 150°C QD Performance and Lifetime Characterization
Current solid-state lighting relies on down-converting emitters that absorb high-energy light and re-emit it at lower wavelengths to create white light, but achieving both high efficiency and color quality demands materials capable of withstanding demanding conditions. While quantum dots show promise as efficient emitters, their application in LEDs has largely focused on cadmium-containing varieties, raising toxicity concerns and regulatory hurdles. A recently funded project, led by Nanosys Inc. and the University of California, Merced, aims to address these limitations by developing heavy-metal-free quantum dots specifically engineered for LED environments. The project’s key deliverables include comprehensive structural and photophysical characterization of these novel quantum dots, with a focus on identifying attributes that enhance performance and longevity, establishing quantum dots as a reliable, sustainable component in the next generation of solid-state lighting technologies.
The goal for lifetime increase is 100-fold.
Charlie Hotz, Nanosys Inc.
