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.
Highlights
Today CO2 content in the atmosphere is increasing because of the fossil based energy production throughout the world [1]
Another important performance parameter is the luminous efficacy of optical radiation (LER), which represents the optical efficiency of the light source perceived by the human eye
When the spectra with color rendering index (CRI)
Summary
Today CO2 content in the atmosphere is increasing because of the fossil based energy production throughout the world [1]. One of the related research areas is the solid state lighting, which can potentially decrease the energy consumption for lighting by fifty percent if the light emitting diode (LED) performance targets are realized [4] To this end, since colloidal semiconductor quantum dot nanocrystals (NCs) exhibit favorable properties including tuneable emission wavelength, easy processing, and reasonable quantum efficiency, LEDs involving nanocrystal luminophores have recently attracted significant attention for high-quality white light generation [5]. Optical parameters including the peak emission wavelength (WL), full-width-at-half-maximum (FWHM), and the relative amplitude of each NC color component need to be carefully designed to achieve such high-quality white light generation with CRI>90, LER>380 lm/W at a warm CCT (i.e., CCT
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