Optical constants study of YAG:Ce phosphor layer blended with SiO<sub>2</sub> particles by Mie theory for white light-emitting diode package

doi:10.1007/s12200-012-0255-0

Front Optoelec

2012, Vol. 5

Issue (2) : 138-146 https://doi.org/10.1007/s12200-012-0255-0

RESEARCH ARTICLE

Optical constants study of YAG:Ce phosphor layer blended with SiO₂ particles by Mie theory for white light-emitting diode package

Run HU^1,2, Xiaobing LUO^1,2(

), Huai ZHENG¹, Sheng LIU^2,3

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

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Abstract

Optical constants, including scattering coefficient, absorption coefficient, asymmetry parameter and reduced scattering coefficient, of cerium-doped yttrium aluminium garnets (YAG:Ce) phosphor blended with SiO₂ particle for white light-emitting diode (LED) packages were calculated based on Mie theory in this study. Calculation processes were presented in detail. Variations of the optical constants with the changes of phosphor weight fraction, dopant weight fraction, phosphor particle radius and SiO₂ particle radius, were shown and analyzed separately. It was found that the asymmetry parameter is the intrinsic characteristic of the particles, and the increase of the phosphor weight fraction (or concentration) will lead to the increase of the optical constants. It was also discovered that the increase of the dopant weight fraction will enhance the scattering coefficient, but result in the decreases of the reduced scattering coefficient and the absorption coefficient.

Keywords Mie theory phosphor optical constant light-emitting diode (LED)

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

Issue Date: 05 June 2012

Cite this article:

Xiaobing LUO,Huai ZHENG,Run HU, et al. Optical constants study of YAG:Ce phosphor layer blended with SiO₂ particles by Mie theory for white light-emitting diode package[J]. Front Optoelec, 2012, 5(2): 138-146.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-012-0255-0
https://academic.hep.com.cn/foe/EN/Y2012/V5/I2/138

Fig.1 Variation of optical constants of YAG:Ce phosphor without SiO dopant for blue light with the increase of absorption coefficient of phosphor crystal

Fig.2 Variation of optical constants of YAG:Ce phosphor without SiO dopant for yellow light with the increase of absorption coefficient of phosphor crystal

Fig.3 Variation of the optical constants of YAG∶Ce phosphor without SiO dopant with the increase of phosphor weight fraction for blue light

Fig.4 Variation of the optical constants of YAG∶Ce phosphor with the increase of dopant weight fraction for blue light

Fig.5 Variation of the optical constants of SiO particles with the increase of dopant weight fraction for blue light

Fig.6 Variation of the optical constants of phosphor layer with the increase of dopant weight fraction and phosphor particle radius for blue light

Fig.7 Variation of the optical constants of phosphor layer with the increase of phosphor weight fraction and dopant weight fraction for blue light

Fig.8 Variation of the optical constants of phosphor layer with the increase of dopant SiO particle radius for blue light

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