Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Primary optics for efficient high-brightness LED color mixing
Year:2012
Research Areas
  • Engineering
Information
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.
International
Si
Congress
Efficient Design for Illumination and Solar Concentration IX Nonimaging Optics
960
Place
San Diego, CA, USA
Reviewers
Si
ISBN/ISSN
9780819492029
10.1117/12.931508
Start Date
12/08/2012
End Date
14/08/2012
From page
84850
To page
8485011
Proc. of SPIE Vol. 8485 84850Q
Participants
  • Autor: Aleksandra Cvetkovic . (UPM)
  • Autor: R Mohedano (LPI)
  • Autor: O. Dross (Philips Research,)
  • Autor: Maikel Hernández Sanz (UPM)
  • Autor: Pablo Benitez Gimenez (UPM)
  • Autor: Juan Carlos Miñano Dominguez (UPM)
  • Autor: J.Vilaplanalana Vilaplana (LPI)
  • Autor: J. Chaves (LPI)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Ingeniería Óptica
  • Centro o Instituto I+D+i: Centro de Domótica Integral, CEDINT
  • Departamento: Electrónica Física
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)