Jul 26, 2016

Thermal characteristics and fabrication of silicon sub-mount based LED package

Highlights

The cost of an LED package is lowered by using a silicon substrate as the base attached to the chip.
A silicon sub-mount based LED package is proposed a different method.
The silicon sub-mount based COB package is applicable to high-power down-light type LED light sources.

Abstract

In this paper, the cost of a light emitting diode (LED) package is lowered by using a silicon substrate as the base attached to the chip, in contrast to the conventional chip-on-board (COB) package. In addition we proposed an LED package with a new structure to promote reliability and lifespan by maximizing heat dissipation from the chip. We designed an LED package combining the advantages of COB based on conventional metal printed circuit board (PCB) and the merits of a silicon sub-mount as a substrate. When an input current 500–1000 mA was applied, the fabricated LED exhibited the light output of approximately 112 lm/W at 29 W. We also measured and compared the thermal resistance of the sub-mount package and conventional COB package. The measured thermal resistance of the sub-mount package with a reflective film of Ag and the COB package were 0.625 K/W and 1.352 K/W, respectively.

Keywords

  • COB package
  • Silicon sub-mount
  • LED package
  • Thermal resistance
      • Source: Sciencedirect
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