Tailoring of the Color Conversion Elements in Phosphor-Converted High-Power LEDs by Optical Simulations

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. The simulations reveal that a constant thickness of the CCE by itself is not...

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Bibliographic Details
Published in:IEEE photonics technology letters 2008-05, Vol.20 (9), p.739-741
Main Authors: Sommer, C., Wenzl, F.P., Hartmann, P., Pachler, P., Schweighart, M., Leising, G.
Format: Article
Language:English
Subjects:
Coatings
Color
Conversion
Emission
Emittance
Fluorescent lamps
Geometrical optics
Geometry
Homogeneity
LED lamps
Light emitting diodes
Light-emitting diodes (LEDs)
lighting
Optical scattering
Phosphors
Simulation
Solid modeling
Stimulated emission
White light
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Summary: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. The simulations reveal that a constant thickness of the CCE by itself is not sufficient for a homogeneous white light emission. Rather the height and the broadness of the CCE as well as the phosphor concentration have to be precisely adjusted in order to assure a homogeneous white light emission.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2008.921063