The most common method of making white light emitting diode (LED) is to mix the blue light from the LED die and the
wavelength converted yellow light from the phosphor layer. The color conversion efficiency depends on the geometry
and concentration of the phosphor layer including phosphor material. Thus the optimization of the phosphor geometry
and concentration make increase the luminous efficiency of the white LED. In this paper, the remote phosphor scheme is
optimized focusing on increasing the luminous efficiency in high power. The phosphor layer is separated by the silicone
resin from the LED die. The silicone resin covers the LED die with dome shape to increase the extraction efficiency. The
phosphor layer has very large volume with dilute concentration. The separation of phosphor layer from LED die and
very large volumetric dilute phosphor layer were great important role in increasing the luminous flux. The improved
luminous flux was 15% for 1mm2 LED die at 700mA.
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