Influence of blue-light polarization on light scattering in nanocrystal luminescent glass for white light-emitting-diodes

The influence of the polarized state of blue light on light scattering in InGaN blue chip nano-crystal luminescent glass for solid state lighting is investigated. Based on Rayleigh-Debye approximation theory, theoretical relationships between the light scattering turbidity and wavelength of the incident light, radius and refractive index of the nano-crystals are established to simulate the situations in yttrium aluminate garnet (YAG), silicate and oxynitride based luminescence glass. It is revealed that the scattering turbidity in luminescent glass turns to be the smallest as the effective refractive index of nanocrystals is equal to that of parent glass, and the scattering turbidity for the vertically polarized incident light is greater than that for the un-polarized incident light, while that for the horizontally polarized incident light is smaller than that for the unpolarized incident light under the same conditions. © 2010 Tianjin University of Technology and Springer-Verlag Berlin Heidelberg.