SBIR-STTR Award

This Small Businesses Innovation Phase I research project concerns the development of a new class of polymer encapsulation materials with a very high refractive index (exceeding 2.0) and the use of the encapsulant material for light-emitting diodes (LEDs) with high light-extraction efficiency. The proposed effort introduces a new class of nanomaterial-based polymer encapsulants with an unprecedented high refractive index (n > 2.0). Such materials would be extremely beneficial for light extraction in light-emitting diodes. Increases of 20 % - 45 % in light extraction efficiency are expected from the employment of the new encapsulant. The intellectual merit also lies in the fundamental assessment of the optical scattering properties of this nanocomposite. The availability of the new encapsulant would be very beneficial to all technical fields employing LEDs including signage, lighting, communications, imaging, biotechnology, and medicine. The development of a new high-index encapsulant would have a tremendous impact on LED technology because virtually all LEDs are packaged and encapsulated. A successful completion of the program could result in a worldwide paradigmatic shift in the packaging and encapsulation of optoelectronic devices. The broad deployment of efficient LED technology for general lighting applications would result in electrical energy savings in the TWh range per year in the United States

This Small Business Innovation Research (SBIR) Phase II project addresses the development of a new class of materials, namely polymeric nanomaterials with a very high refractive index, which will closely match the refractive index of inorganic semiconductors. The encapsulant materials consist of titania-nanoparticle-loaded silicone and epoxy. Titania (TiO2) has a refractive index of 2.68 and the admixture of TiO2 with a polymer would result in an increase of the refractive index. The well-known problem of excessive optical scattering will be overcome by proper use of surfactants and an encapsulation structure that employs thin films, with a thickness that is less than the average distance between scattering events. If successful the development of a new high-index encapsulant will have a tremendous impact on SSL technology because virtually all SSL devices made of inorganic semiconductors are packaged and encapsulated. A successful completion of the program will result in a worldwide paradigmatic shift in the packaging and encapsulation of optoelectronic devices. The broad deployment of efficient LED technology for general lighting applications would also result in electrical energy savings in the TWh range per year within the United States alone