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Remote Pyramid-Shaped Phosphor Coating for Phosphor-Converted White LEDs
Institute of Physics, Azerbaijan National Academy of Sciences, Baku, Azerbaijan
Research and Development Center for High Technologies, Ministry of Communications and High Technologies, Baku, Azerbaijan
Research and Development Center for High Technologies, Ministry of Communications and High Technologies, Baku, Azerbaijan
Institute of Physics, Azerbaijan National Academy of Sciences, Baku, Azerbaijan
Sumgait State University, Sumgait, Azerbaijan
- 1 Institute of Physics, Azerbaijan National Academy of Sciences, Baku, Azerbaijan
- 2 Research and Development Center for High Technologies, Ministry of Communications and High Technologies, Baku, Azerbaijan
- 3 Research and Development Center for High Technologies, Ministry of Communications and High Technologies, Baku, Azerbaijan
- 4 Institute of Physics, Azerbaijan National Academy of Sciences, Baku, Azerbaijan
- 5 Sumgait State University, Sumgait, Azerbaijan
World Journal of Nano Science and Engineering·Volume 07 (2017)·Pages 17–24·Published 21 June 2017·DOI10.4236/wjnse.2017.72002
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Abstract
Increasing light extraction efficiency is an important task when it comes to manufacturing a powerful white light emitting diode with high luminous flux per watt. In this paper the fabrication of a pyramid-shaped 3-dimensional phosphor coating is reported. It is represented by a phosphor cover, shaped into an array of pyramid like formations. It is proposed that such a structure can improve the light extraction efficiency and the color distribution characteristics of any phosphor-converted white LED. The luminous flux and luminous efficacy are being studied as a function of the forward current across the die. It was found out that with this kind of technique it was possible to achieve an 8% - 14% increase in the efficacy of the pc-LED. This increase of light output power is being attributed to the reduction of the phenomena of total internal reflection (TIR) inside the packaging module.
KeywordsLight Emitting Diode (LED)Chip-On Board (COB) PackageLight Extraction EfficiencyTotal Internal Reflection (TIR)
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