Frontiers of Optoelectronics, Volume. 5, Issue 2, 153(2012)
Effects of packaging structure on optical performances of phosphor converted light emitting diodes
Effects of tilt angles of reflective cup structure and phosphor surface geometries on light extraction efficiency and angular color uniformity (ACU) of phosphor converted light emitting diodes (pcLED) are investigated by Monte Carlo ray-tracing simulations. It is found that tilt angles of reflective cup and phosphor surface geometries affect the light extraction efficiency and the ACU distinctly. When the tilt angle varied from 60° to 15°, the light extraction efficiency of LED can achieve the improvements of 13.87%, 18.25% and 14.79% respectively, when the phosphor surface geometry is concave, flat and convex, respectively. It is also found the variety law of phosphor concentrations with the change of tilt angles and phosphor surface geometries to maintain a fixed correlated color temperature (CCT).
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Xing FU, Huai ZHENG, Sheng LIU, Xiaobing LUO. Effects of packaging structure on optical performances of phosphor converted light emitting diodes[J]. Frontiers of Optoelectronics, 2012, 5(2): 153
Received: Nov. 28, 2011
Accepted: Dec. 8, 2011
Published Online: Feb. 23, 2013
The Author Email: LUO Xiaobing (luoxb@mail.hust.edu.cn)