Journal ArticleDOI
Measurement and numerical studies of optical properties of YAG:Ce phosphor for white light-emitting diode packaging
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TLDR
Comparisons revealed that Mie theory can predict the variation of the optical constants of phosphor, but the absorption and scattering cross sections should be multiplied with two fitting parameters.Abstract:
The optical properties of YAG:Ce phosphor were measured by a double-integrating-sphere system and calculated by Mie theory and Monte Carlo ray tracing to provide precise optical characterizations of YAG:Ce phosphor for white light-emitting diode (LED) packaging design. Measurement results showed that the phosphor presents strong absorption for blue light, high reflection for yellow light, and an isotropic emission pattern of converted light. The conversion efficiency and quantum efficiency for the saturated phosphor are around 70% and 87%, respectively. Based on the measurement results, the absorption coefficient, scattering coefficient, and anisotropy factor of the phosphor calculated by Mie theory were compared with those calculated by ray-tracing simulation to modify Mie theory to find a reasonable method that can easily obtain the optical constants of YAG:Ce phosphor. Comparisons revealed that Mie theory can predict the variation of the optical constants of phosphor, but the absorption and scattering cross sections should be multiplied with two fitting parameters. The fitting parameters have been given in this study and can be obtained by testing packaged LEDs with different phosphor concentrations.read more
Citations
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References
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Journal ArticleDOI
Tailoring of the Color Conversion Elements in Phosphor-Converted High-Power LEDs by Optical Simulations
Christian Sommer,Franz P. Wenzl,Paul Hartmann,Peter Pachler,Marko Schweighart,Günther Leising +5 more
TL;DR: In this paper, Ray-tracing simulations are used to identify the demands for angular homogeneity of the white light emitted from phosphor-converted white light-emitting diodes having color conversion elements (CCEs) of constant thickness.
Journal ArticleDOI
Single scattering by a small volume element
TL;DR: In this paper, a detailed analysis of the concept of single scattering of light by a small volume element filled with sparsely and randomly positioned particles is presented, and the formulas of the far-field single-scattering approximation are derived.
Proceedings ArticleDOI
Phosphors for solid state lighting
TL;DR: After an introduction of the basic concepts for solid-state-lighting, white LED phosphors are discussed regarding their match to different application requirements, different phosphor solutions for white LEDs mainly regarding these requirements are evaluated.
Journal ArticleDOI
Absorption and scattering of light by pigment particles in solar-absorbing paints
TL;DR: It was concluded that, during drying and curing of coatings, spherical primary pigment particles most likely collect in elongated groups oriented perpendicularly to the coating surface, which helps in understanding the independent measurements of solar absorptance.
Proceedings ArticleDOI
Investigation of the optical properties of YAG:Ce phosphor
TL;DR: In this paper, an optical ray-tracing analysis of a remote phosphor white LED package was conducted to quantify at different wavelengths of light the optical properties of a medium that has YAG:Ce phosphor mixture mixed into epoxy.
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