Author(s)

Sevda Hasan Abdullayeva^1,2, Teymur Yashar Orujov^1,2, Nahida Nazim Musayeva^1,2, Rasim Baba Jabbarov^1,2, Samir Kamal Orujov³

¹Institute of Physics, Azerbaijan National Academy of Sciences, Baku, Azerbaijan.
²Research and Development Center for High Technologies, Ministry of Communications and High Technologies, Baku, Azerbaijan.
³Sumgait State University, Sumgait, Azerbaijan.

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.

Light Emitting Diode (LED), Chip-On Board (COB) Package, Light Extraction Efficiency, Total Internal Reflection (TIR)

Abdullayeva, S. , Yashar Orujov, T. , Musayeva, N. , Jabbarov, R. and Orujov, S. (2017) Remote Pyramid-Shaped Phosphor Coating for Phosphor-Converted White LEDs. World Journal of Nano Science and Engineering, 7, 17-24. doi: 10.4236/wjnse.2017.72002.