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Proceedings Paper

Simulation of white LEDs with a planar luminescent layer using the extended Adding-Doubling method
Author(s): Jana Ryckaert; Sven Leyre; Peter Hanselaer; Youri Meuret
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Paper Abstract

The most common method to create white light with LEDs is the use of a luminescent material (e.g. phosphor) in combination with one or more blue LEDs. Different configurations can be used (intimate phosphor, remote phosphor, phosphor layer on top of a chip-on-board LED array). To design high quality LED sources it is important that these systems can be optimized. The Monte Carlo ray-tracing method is the traditional algorithm to simulate these systems. A disadvantage of the Monte Carlo method however is the large computation time which makes it less suitable for system optimization.

We present a new simulation method to predict the performance of various white LED packages with a planar phosphor layer using the extended Adding-Doubling method. In a phosphor converted white LED part of the incident and converted light is back-scattered from the phosphor layer towards the LED package. This light will be partly reflected back onto the phosphor layer by the LED package. When simulating the LED source with the extended Adding-Doubling method, the behavior of the LED package can be approximated by a reflection matrix. This matrix includes the directions in which the light is scattered from the LED package, as well as the efficiencies.

We found that, by using the extended Adding-Doubling method with the appropriate reflection matrix, it is possible to predict the total flux and the spectral angular intensity distribution of the light emitted from white LED packages with a planar luminescent layer. With this method we present a fast technique to predict the performance of phosphor converted white LEDs and optimize the optical parameters of the luminescent layer to obtain the best overall performance.

Paper Details

Date Published: 23 September 2015
PDF: 8 pages
Proc. SPIE 9629, Optical Systems Design 2015: Illumination Optics IV, 96290K (23 September 2015); doi: 10.1117/12.2191165
Show Author Affiliations
Jana Ryckaert, KU Leuven (Belgium)
Sven Leyre, KU Leuven (Belgium)
Peter Hanselaer, KU Leuven (Belgium)
Youri Meuret, KU Leuven (Belgium)

Published in SPIE Proceedings Vol. 9629:
Optical Systems Design 2015: Illumination Optics IV
Tina E. Kidger; Stuart David, Editor(s)

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