Research Project Summary Information
Development of a High-Efficiency LED based Lighitng System using Nanocrystal(ST8278-1)
Evident Technologies Inc.
Lighting accounts for over 20% of the electric energy consumed in New York State and increases each year. For over 100 years two electric light sources fulfilled lighting needs; incandescent and gas discharge. The incandescent lamp is the most popular residential light source, but it is extremely inefficient, converting less than 8% of its total energy to light energy. The fluorescent lamp is 5-to-6 times more efficacious compared to the incandescent lamp, and is the most popular light source in commercial and industrial applications, but the fluorescent converts 25 to 30% of the electric energy it consumes into visible light. White light emitting diodes (LEDs) were demonstrated in the mid-1990s but need higher efficacies and better color properties before they can be used to replace incandescent and fluorescent light sources for general illumination. The most advanced, commercially available white LED source is currently rated around 20 to 25 lumens per watt, and these efficacies are far from the U.S. Department of Energy (U.S. DOE) goals for luminous efficacy of 200 lumens per watt by 2020.
The Contractor (1) conducted research and analysis on the lighting characteristics of its nanocrystals and associated components; (2) identified the functional requirements of the system, materials, and components; (3) designed and prototyped a white LED system; (4) manufactured the nanocrystals and matrix materials; (5) assembled the components into a test fixture; (6) conducted an initial optimization analysis; and (7) developed a commercialization plan.
LEDs promise to reduce energy associated with lighting use, but current efficiencies and the white light quality of LEDs need to be improved to make LEDs competitive with incandescent and fluorescent light sources. The application of phosphors to LEDs can be used to both increase efficiency of high-efficiency blue LEDs and improve the white color of the lighting.
The Contractor completed the work tasks but was unable to achieve 90 lm/W from LEDs coated with its nanocrystals. The project was only able to demonstrate LEDs with 23 lm/W. Significantly greater efficacies are required before LEDs can be used to replace fluorescent and incandescent light sources. The Contractor does not intend to commercialize its nanocrystal coated LEDs at this point in time. Niche applications, such as LED Christmas tree lights, will be pursued until efficacies approaching 90 lm/W can be achieved.
Evident Technologies Inc.
216 River St
Troy, NY 12180
Rensselaer Polytechnic Institute
NYSERDA Contact Information
R&D - Buildings Research