Primary optics for efficient high-brightness LED color mixing

Cvetkovic, Aleksandra and Mohedano, Rubén and Dross, Oliver and Hernández Sanz, Maikel and Benitez Gimenez, Pablo and Miñano Dominguez, Juan Carlos and Vilaplana, J. and Chaves, Julio (2012). Primary optics for efficient high-brightness LED color mixing. In: "Proceedings of SPIE. Nonimaging Optics: Efficient Design for Illumination and Solar Concentration IX", 12/08/2012 - 14/08/2012, San Diego, California, USA. pp. 848501-8485011. https://doi.org/10.1117/12.931508.

Description

Title: Primary optics for efficient high-brightness LED color mixing
Author/s:
  • Cvetkovic, Aleksandra
  • Mohedano, Rubén
  • Dross, Oliver
  • Hernández Sanz, Maikel
  • Benitez Gimenez, Pablo
  • Miñano Dominguez, Juan Carlos
  • Vilaplana, J.
  • Chaves, Julio
Item Type: Presentation at Congress or Conference (Article)
Event Title: Proceedings of SPIE. Nonimaging Optics: Efficient Design for Illumination and Solar Concentration IX
Event Dates: 12/08/2012 - 14/08/2012
Event Location: San Diego, California, USA
Title of Book: Proceedings of SPIE. Nonimaging Optics: Efficient Design for Illumination and Solar Concentration IX
Date: 2012
Volume: 8485
Subjects:
Freetext Keywords: General illumination, colour mixing, Kohler integration Microlens ; Near field ; Diffusers
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Electrónica Física
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

In SSL general illumination, there is a clear trend to high flux packages with higher efficiency and higher CRI addressed with the use of multiple color chips and phosphors. However, such light sources require the optics provide color mixing, both in the near-field and far-field. This design problem is specially challenging for collimated luminaries, in which diffusers (which dramatically reduce the brightness) cannot be applied without enlarging the exit aperture too much. In this work we present first injection molded prototypes of a novel primary shell-shaped optics that have microlenses on both sides to provide Köhler integration. This shell is design so when it is placed on top of an inhomogeneous multichip Lambertian LED, creates a highly homogeneous virtual source (i.e, spatially and angularly mixed), also Lambertian, which is located in the same position with only small increment of the size (about 10-20%, so the average brightness is similar to the brightness of the source). This shell-mixer device is very versatile and permits now to use a lens or a reflector secondary optics to collimate the light as desired, without color separation effects. Experimental measurements have shown optical efficiency of the shell of 95%, and highly homogeneous angular intensity distribution of collimated beams, in good agreement with the ray-tracing simulations.

More information

Item ID: 19716
DC Identifier: http://oa.upm.es/19716/
OAI Identifier: oai:oa.upm.es:19716
DOI: 10.1117/12.931508
Official URL: http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1379450
Deposited by: Memoria Investigacion
Deposited on: 15 Sep 2013 09:55
Last Modified: 21 Apr 2016 20:58
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