Rensselaer researchers have developed a new class of phosphors that have narrow spectral linewidths suitable for high-efficiency, white light LED fabrication for lighting and display applications. These phosphors can be efficiently excited by near UV and blue LEDs such as in 400 nm LEDs and can provide emission in green, yellow, amber and red wavelengths. Commercial phosphor-converted white LEDs lack narrow-emitting red phosphors that are effectively excited by blue or near ultraviolet LEDs.
Rensselaer researchers have developed programmable directed mesoscopic self-assembly and energy-assisted placement processes suitable for high speed, high accuracy, and low-defect rate LED system packaging operations. Current LED packaging technology is handled one semiconductor device element at a time, and is limited to a speed of about 10K units per hour. New technology is needed to package these devices, as well as associated control devices, into integrated lighting systems at much higher speeds, up to 10K units per minute.
This technology relates to an ultra high efficient LED system with the capability to modify an LEDs radiation pattern by changing its physical dimension-emission beam shape. The ultra high efficiency and redistribution of light has been achieved without the use of a back reflector. The ultra high efficiency can be controlled by changing the size of the nanorods within the design. These features can be very useful for bio-sensing and bio-imaging applications.