%0 Journal Article
%T Remote Pyramid-Shaped Phosphor Coating for Phosphor-Converted White LEDs
%A Sevda Hasan Abdullayeva
%A Teymur Yashar Orujov
%A Nahida Nazim Musayeva
%A Rasim Baba Jabbarov
%A Samir Kamal Orujov
%J World Journal of Nano Science and Engineering
%P 17-24
%@ 2161-4962
%D 2017
%I Scientific Research Publishing
%R 10.4236/wjnse.2017.72002
%X 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.
%K Light Emitting Diode (LED)
%K Chip-On Board (COB) Package
%K Light Extraction Efficiency
%K Total Internal Reflection (TIR)
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=77043