A high efficacy and tunable white light‐emitting diode cluster with both color fidelity and nonvisual performances close to natural lights

Abstract

A luminous efficacy model for a white light-emitting diode (LED) cluster was developed, and five α-opic efficacy ratios (γ α,V s) of intrinsically photosensitive retinal ganglion cells were adopted in order to quantify its nonvisual performance relative to natural light. A tunable C/A/R LED cluster, which consists of the cyan LEDs with green phosphor excited by a blue LED, the amber LEDs with green and orange phosphors excited by same blue chip, and the red LEDs, was proposed by maximizing the average luminous efficacy at correlated color temperatures (CCTs) of 2700 to 6500 K under the condition of color fidelity index (R f) above 96 and five values of γ α,V of 0.95 to 1.

White-light emission from organic aggregates: a review

“…Compared with traditional incandescent lightbulbs and inefficient mercurydischarge-based fluorescent lamps, solid-state sources such as LEDs exhibit advantages such as high efficacy, small size, color stability, controllability, and variability, thus attracting increasing attention from scientists and industries. [2][3][4] Being different from traditional light sources with monochromatic light, white-light emitters should produce polychromatic lights simultaneously, which usually requires them to have di-, tri-, or tetrachromatic sources. 2,3,5 For example, white-light LEDs with high brightness and durability could be realized by synergistically combining traditional LED with three primary colors (e.g., blue InGaN LED, green InGaN LED, and red GaAlAs LED).…”

“…[2][3][4] Being different from traditional light sources with monochromatic light, white-light emitters should produce polychromatic lights simultaneously, which usually requires them to have di-, tri-, or tetrachromatic sources. 2,3,5 For example, white-light LEDs with high brightness and durability could be realized by synergistically combining traditional LED with three primary colors (e.g., blue InGaN LED, green InGaN LED, and red GaAlAs LED). 6 Other strategies based on ultraviolet/blue LED plus phosphors have been successfully utilized.…”