TY - JOUR
T1 - Extraction optics for high lumen density sources
AU - de Boer, Dick K.G.
AU - Haenen, Ludo
PY - 2019/12/1
Y1 - 2019/12/1
N2 - 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.
AB - 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.
KW - Collimation
KW - High-brightness source
KW - Light-emitting diodes
KW - Luminescence
KW - Optical design
UR - http://www.scopus.com/inward/record.url?scp=85066610687&partnerID=8YFLogxK
U2 - 10.1186/s41476-019-0109-0
DO - 10.1186/s41476-019-0109-0
M3 - Article
AN - SCOPUS:85066610687
SN - 1990-2573
VL - 15
JO - Journal of the European Optical Society: Rapid Publications
JF - Journal of the European Optical Society: Rapid Publications
IS - 1
M1 - 8
ER -