title: A photometric investigation of ultra-efficient LEDs with high color rendering index and high luminous efficacy employing nanocrystal quantum dot luminophores.
abstract: We report a photometric study of ultra-efficient light emitting diodes (LEDs) that exhibit superior color rendering index (CRI) and luminous efficacy of optical radiation (LER) using semiconductor quantum dot nanocrystal (NC) luminophores. Over 200 million systematically varied NC-LED designs have been simulated to understand feasible performance in terms of CRI vs. LER. We evaluated the effects of design parameters including peak emission wavelength, full-width-at-half-maximum, and relative amplitudes of each NC color component on LED performance. Warm-white LEDs with CRI >90 and LER >380 lm/W at a correlated color temperature of 3000 K are shown to be achieved using nanocrystal luminophores.
authors.affiliation: Department of Electrical and Electronics Engineering, Department of Physics, Nanotechnology Research Center, Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey.
authors.forename: Talha
authors.initials: T
authors.lastname: Erdem
authors.forename: Sedat
authors.initials: S
authors.lastname: Nizamoglu
authors.forename: Xiao Wei
authors.initials: XW
authors.lastname: Sun
authors.forename: Hilmi Volkan
authors.initials: HV
authors.lastname: Demir
mesh_terms: D003116:Color; D003124:Colorimetry / Q000379:methods; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008029:Lighting / Q000295:instrumentation*; D008163:Luminescent Measurements / Q000295:instrumentation*; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000295:instrumentation; D055096:Optical Devices; D010783:Photometry; D045663:Quantum Dots; D012031:Refractometry; D015203:Reproducibility of Results; D012666:Semiconductors; D012680:Sensitivity and Specificity