| Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 15, Number 1, 2019
Highlights of EOSAM 2018
|
|
|---|---|---|
| Article Number | 8 | |
| Number of page(s) | 8 | |
| DOI | https://doi.org/10.1186/s41476-019-0109-0 | |
| Published online | 04 June 2019 | |
Research
Extraction optics for high lumen density sources
Signify Research, High Tech Campus 7, 5656AE, Eindhoven, The Netherlands
Received:
13
March
2019
Accepted:
20
May
2019
For lighting applications demanding high brightness, a new type of LED-based light source has been developed, the high lumen density (HLD) source (luminance > 2·109 cd/m2). The performance can be improved further, among other things by optimizing the concentrator used as extraction optics. For this optimization, much insight is obtained by ray-tracing simulations. The efficiency can be improved by more than 20% if a high-index concentrator could be used. Furthermore, it is possible to optimize the shape of the concentrator. For a low-index (n ≈ 1.5) concentrator, the light leakage can be reduced, but the gain in useful light is only marginal. For a high-index (n ≈ 1.8) concentrator, the gain in useful light amounts to a few percent.
Key words: Collimation / Light-emitting diodes / Luminescence / Optical design / High-brightness source
© The Author(s) 2019
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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