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

Author

Sommer, Christoph ; Wenzl, F.P. ; Hartmann, Peter ; Pachler, P. ; Schweighart, M. ; Leising, G.

Author_Institution

Inst. of Nanostructured Mater. & Photonics, Weiz

Volume

20

Issue

9

fYear

2008

fDate

5/1/2008 12:00:00 AM

Firstpage

739

Lastpage

741

Abstract

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.

Keywords

light emitting diodes; phosphors; ray tracing; angular homogeneity; color conversion elements; homogeneous white light emission; optical simulations; phosphor-converted high-power LED; phosphor-converted white light-emitting diodes; ray-tracing simulations; Coatings; Fluorescent lamps; Geometrical optics; Geometry; LED lamps; Light emitting diodes; Optical scattering; Phosphors; Solid modeling; Stimulated emission; Light-emitting diodes (LEDs); lighting; simulation;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2008.921063

Filename

4512102