Current white solid state lamps that exceed 100 lumens have a luminous efficacy 2.5 times lower than the threshold required for insertion in illumination applications, and a cost that is ten times too high. Performance-enhancing nanomaterials could increase efficiency if packaged with enhanced light extraction efficiency from an LED-chip. This project will enhance both the Package Optical Efficiency and Light Extraction Efficiency of the LED die by developing and using optically non-scattering, highly efficient, nanophosphor-based downconverters and high refractive index nanocomposite LED die/chip encapsulants. The resultant light output of the high-flux lamp would exceed 450 lumens, corresponding to a luminous efficacy of 95 lumens/Watt using current die technology. With future improved LED materials, the luminous efficacy would be expected to reach 150 lumens/Watt. Phase I will develop nanophosphors for downconverters and high refractive nanocomposites for encapsulants, that can be integrated into high flux, high power, white LED lamp packages operating at temperatures greater than 80°C and having optical intensities exceeding several kilowatts/cm2. Commercial Applications and Other Benefits as described by awardee: Successful application of solid state lighting devices in general illumination applications (including commercial and industrial buildings, residences, and other outdoor applications) should provide significant economic and environmental benefits
