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Green-yellow gap in the white can be saved?

  • Source:net
  • Release on :2017-05-11
    Shenzhen Risen OPTO Co.,ltd, led RGB light supplier in china,led outdoor stadium lighting manufacturers,led lamp fixtures supplier.
 
    Researchers at King Abdullah University of Science and Technology (KAUST) and King Abdulaziz City for Science and Technology (KACST) have proposed a novel approach that can be used to fill in white LED applications based on multi-phosphor applications. Caused by the "green-yellow gap"

    In a "True Yellow Light-Emitting Diodes as Phosphor for Tunable Color-Rendering Index Laser-based White Light" published in the journal "ACS Photonics", a nanowire LED (NW LED ), Capable of growing on low cost titanium (Ti) thin film / silicon (Si) substrate platforms compatible with CMOS processes. Its tight nanowire layer can grow to a surface density of 9x109 cm ^ 2 with a fill factor of 88%.

     Each nanowire p-i-n LED structure is embedded in a 5-layer 3nm thick InGaN Quantum Disc (Qdisk) stack of active areas, between the layers and 10nm quantum barrier layer separated.
 
     When the yellow light nanowires were operated alone, the researchers observed a peak emission of 588 nm and a low on-voltage of about 2.5 V at 29.5 A / cm ^ 2 (about 75 mA on a 0.5 x 0.5 mm ^ 2 assembly) Quantum efficiency of about 39%, and reached 29.5A / cm ^ 2 before the injection density, and will not appear "efficiency reduction" situation.
 
     Then, the researchers demonstrated the benefits of mixing this yellow and red, green, and blue laser diodes. In the actual setting, the use of RGB light beam irradiation yellow light nanowires LED, like fluorescent, and in the reflective configuration using light scattering layer, in the white light mixture to add its yellow light emission.
 
     The result is a correlated color temperature of about 6000K, and a color rendering index of 87.7.


    KoonST Solid State Lighting Technology Innovation Center Director and Electronic Engineering Professor Boon S. Ooi said that the goal of this method is to reduce the white light in the blue light intensity, thus creating a more friendly for the human eye warm white light, while based on the laser The solid state lighting (SSL) provides a new way to tune the color temperature. "At present, we have patented this technology," and this also implies some of the future business opportunities.

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