Abstract
Phosphor-converted white light-emitting diodes (pc-WLEDs) are excellent energy-efficient light sources for artificial lighting applications. One goal of artificial lighting is to make objects/images look natural – as they look under the sunlight. The ability of a light source to accurately render the natural color of an object is gauged by the parameter – color rendering index (CRI). A conventional pc-WLED has an average CRI ~ 80, which is very low for accurate color reproduction. To utilize the pc-WLEDs for artificial lighting applications, all the CRI points (R1 – R15) should be above 95. However, there is a trade-off between CRI and luminous efficacy (LER), and it is challenging to increase both CRI and LER. Herein we propose a novel LED package (PKG) design to achieve CRI points ≥95 and efficiency ~100 lm/W by introducing two blue LEDs and a UV LED in combination with green and red phosphors. The silicone encapsulant, the current through the LEDs, and the green/red phosphor ratio were optimized for achieving high CRI and LER. Our re-designed LED PKG will find applications in stadium lighting as well as for ultra-high-definition television production where high CRI points are required for the artificial light source.
Highlights
Phosphor-converted white light-emitting diodes have emerged as next-generation solid-state lighting technology and is a potential substitute for traditional lighting sources such as incandescent lamps, fluorescent lamps, halogen lamps, and backlights for liquid crystal displays[1,2,3]
Conventional WLEDs consisting of a blue light-emitting diodes (LEDs) and yellow phosphor should be replaced with a high color rendering index (CRI) LED for such specific applications
The 1B-Y PKG has a CRI Ra of 77 and most of the CRI indices exhibit low values which is unsuitable for athletic stadium lighting and ultra-high-definition television (UHDTV) production (Fig. 2b)
Summary
Phosphor-converted white light-emitting diodes (pc-WLEDs) have emerged as next-generation solid-state lighting technology and is a potential substitute for traditional lighting sources such as incandescent lamps, fluorescent lamps, halogen lamps, and backlights for liquid crystal displays[1,2,3]. To achieve CRI points above 95 and LER ~ 100 lm/W simultaneously, we fabricated various WLEDs via the combination of the blue LED, UV LED, and phosphors.
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