n-UV+Blue/Green/Red White Light Emitting Diode Lamps

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  • Kuo Cheng-Huang
    Institute of Microelectronics, Department of Electrical Engineering
  • Sheu Jinn-Kong
    Optical Science Center, National Central University
  • Chang Shoou-Jinn
    Institute of Microelectronics, Department of Electrical Engineering
  • Su Yan-Kuin
    Institute of Microelectronics, Department of Electrical Engineering
  • Wu Liang-Wen
    Institute of Microelectronics, Department of Electrical Engineering
  • Tsai Ji-Ming
    South Epitaxy Corporation
  • Liu C. H.
    Department of Electronic Engineering Nan-Jeon Junior College of Technology and Commerce
  • Wu R. K.
    Nantex Industry Corporation

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Phosphor-conversion light-emitting diode (LED) lamps were fabricated by precoating blue/green/red phosphors onto near-ultraviolet (n-UV) LED chips prior to packaging them into LED lamps. With a 20 mA injection current, it was found that the color temperature, Tc, was approximately 5900 K, the color rendering index, Ra, was approximately 75, and the CIE color coordinates were x=0.33 and y=0.35 for the “n-UV+blue/green/red” white LED lamps. No obvious changes in color temperature, Tc, or color-rendering index, Ra, could be observed when we increased the injection from 20 mA to 60 mA. These results indicate that such “n-UV+blue/green/red” white LED lamps are much more optically stable than the conventional “blue+yellow” LED lamps.

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