Primary optics for efficient high-brightness LED color mixing

Cvetkovic, Aleksandra; Mohedano, Rubén; Dross, Oliver; Hernández Sanz, Maikel; Benitez Gimenez, Pablo; Miñano Dominguez, Juan Carlos; Vilaplana, J. y Chaves, Julio (2012). Primary optics for efficient high-brightness LED color mixing. En: "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.

Descripción

Título: Primary optics for efficient high-brightness LED color mixing
Autor/es:
  • Cvetkovic, Aleksandra
  • Mohedano, Rubén
  • Dross, Oliver
  • Hernández Sanz, Maikel
  • Benitez Gimenez, Pablo
  • Miñano Dominguez, Juan Carlos
  • Vilaplana, J.
  • Chaves, Julio
Tipo de Documento: Ponencia en Congreso o Jornada (Artículo)
Título del Evento: Proceedings of SPIE. Nonimaging Optics: Efficient Design for Illumination and Solar Concentration IX
Fechas del Evento: 12/08/2012 - 14/08/2012
Lugar del Evento: San Diego, California, USA
Título del Libro: Proceedings of SPIE. Nonimaging Optics: Efficient Design for Illumination and Solar Concentration IX
Fecha: 2012
Volumen: 8485
Materias:
Palabras Clave Informales: General illumination, colour mixing, Kohler integration Microlens ; Near field ; Diffusers
Escuela: E.T.S.I. Telecomunicación (UPM)
Departamento: Electrónica Física
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

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.

Más información

ID de Registro: 19716
Identificador DC: http://oa.upm.es/19716/
Identificador OAI: oai:oa.upm.es:19716
Identificador DOI: 10.1117/12.931508
URL Oficial: http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1379450
Depositado por: Memoria Investigacion
Depositado el: 15 Sep 2013 09:55
Ultima Modificación: 21 Abr 2016 20:58
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