Abstract
Phosphor‐converted white light emitting diodes (pc‐LEDs) are being used as a source of artificial lighting. One of the main goals 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 color rendering index (CRI) and a conventional pc‐LED has an average CRI—CRI Ra ~ 80 which is not suitable for artificial lighting. In order to fabricate the pc‐LEDs for artificial lighting applications, all the CRI points (R1 — R15) should be above 95. Herein a novel design strategy of an LED package (PKG) is implemented to achieve CRI points ≥ 95 through introducing two blue LEDs and a UV LED in combination with green and red phosphors. The silicone encapsulant, the ratio of the current through the LEDs, and the phosphor ratio were optimized for achieving high efficiency (~ 100 lm/W) as well as all the CRI points above 95. Our re‐designed LED PKG with an efficiency of around 100 lm/W would find applications in stadium lighting as well as for ultra‐high definition television production where high CRI points are required for the light source.
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