
Proceedings Paper
LED color mixing with diffractive structuresFormat | Member Price | Non-Member Price |
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Paper Abstract
Lighting solutions with colored LEDs provide many opportunities for illumination. One of these opportunities is to
create a color tunable light source. In this way different kinds of white light (color temperature) as well as discrete colors
may be realized. This opens the field for applications as mood lighting.
But there is always a spatial separation of the distinct LEDs that might get converted into an angular separation by any
collimating optics. This angular separation causes such problems like color fringes and colored shadows that cannot be
accepted in most applications. Conventional methods to solve these problems include e.g. mixing rods or dichroic filters.
A new approach is the use of the dispersive effect of a diffractive structure to compensate the angular separation of the
different colors.
In this contribution the potential and limitations of diffractive structures in LED color mixing applications are discussed.
Ray tracing simulations were performed to analyze such important parameters like efficiency, color performance and the
cross section of the color mixing optics. New means for the estimation of color mixing performance were developed. A
software tool makes it possible to detect the color distribution within ray trace data and it provides a quality factor to
estimate the color mixing performance. It can be shown that the spectral band width has a large influence on the mixing
process.
Ray tracing simulations are compared with results of an experimental setup such that both measured as well as simulated
data is presented.
Paper Details
Date Published: 4 March 2013
PDF: 12 pages
Proc. SPIE 8641, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVII, 864107 (4 March 2013); doi: 10.1117/12.2003964
Published in SPIE Proceedings Vol. 8641:
Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVII
Klaus P. Streubel; Heonsu Jeon; Li-Wei Tu; Martin Strassburg, Editor(s)
PDF: 12 pages
Proc. SPIE 8641, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVII, 864107 (4 March 2013); doi: 10.1117/12.2003964
Show Author Affiliations
Theresa Bonenberger, Hochschule Ravensburg-Weingarten (Germany)
Karlsruhe Institute of Technology (Germany)
Jörg Baumgart, Hochschule Ravensburg-Weingarten (Germany)
Karlsruhe Institute of Technology (Germany)
Jörg Baumgart, Hochschule Ravensburg-Weingarten (Germany)
Simon Wendel, Karlsruhe Institute of Technology (Germany)
Cornelius Neumann, Karlsruhe Institute of Technology (Germany)
Cornelius Neumann, Karlsruhe Institute of Technology (Germany)
Published in SPIE Proceedings Vol. 8641:
Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVII
Klaus P. Streubel; Heonsu Jeon; Li-Wei Tu; Martin Strassburg, Editor(s)
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