Remote Pyramid-Shaped Phosphor Coating for Phosphor-Converted White LEDs
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Date
2017-06
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Scientific research
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
Description
Keywords
Light Emitting Diode (LED), Chip-On Board (COB) Package, Light Extraction Efficiency, Total Internal Reflection (TIR)
Citation
World Journal of Nano Science and Engineering, 2017, 7, 17-24