Effects of packaging structure on optical performances of phosphor converted light emitting diodes

doi:10.1007/s12200-012-0254-1

Front Optoelec

2012, Vol. 5

Issue (2) : 153-156 https://doi.org/10.1007/s12200-012-0254-1

RESEARCH ARTICLE

Effects of packaging structure on optical performances of phosphor converted light emitting diodes

Xing FU¹, Huai ZHENG¹, Sheng LIU^2,3, Xiaobing LUO^1,2(

)

1. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; 2. Division of MoEMS, Wuhan National Laboratory for Optoelectronics, Wuhan 430074, China; 3. School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

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).

Keywords phosphor packaging structure reflective cup light emitting diodes (LEDs)

Corresponding Author(s): LUO Xiaobing,Email:luoxb@mail.hust.edu.cn

Issue Date: 05 June 2012

Cite this article:

Xing FU,Huai ZHENG,Sheng LIU, et al. Effects of packaging structure on optical performances of phosphor converted light emitting diodes[J]. Front Optoelec, 2012, 5(2): 153-156.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-012-0254-1
https://academic.hep.com.cn/foe/EN/Y2012/V5/I2/153

Fig.1 Schematics of the phosphor in-cup packages with (a) concave surface, (b) flat surface and (c) convex surface

Fig.2 Dependence of light extraction efficiency on the tilt angle of reflective cup and phosphor surface geometry

Fig.3 Dependence of the ACU on the tilt angle of reflective cup and the phosphor surface geometry

Fig.4 Variety laws of phosphor concentrations with the change of tilt angles of reflective cup and phosphor surface geometries for a fixed CCT

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