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ILLUMINATION DEVICE WITH LED AND A TRANSMISSIVE SUPPORT COMPRISING A LUMINESCENT MATERIAL

  • US 20100328925A1
  • Filed: 01/19/2009
  • Published: 12/30/2010
  • Est. Priority Date: 01/22/2008
  • Status: Abandoned Application
First Claim
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1. An illumination device comprising a light emitting diode (LED) arranged to emit LED emission, a transmissive support comprising a luminescent material, wherein the luminescent material is arranged to absorb at least part of the LED emission and emit luminescent material emission, wherein the LED and the luminescent material are arranged to generate light of a predetermined colour, wherein the illumination device further comprises a translucent exit window arranged to transmit at least part of the light, wherein, relative to the LED, the transmissive support is downstream from the LED, thereby providing a luminescent material LED distance (dLL), and the translucent exit window is downstream from the transmissive support, thereby providing a luminescent material exit window distance (dLW), wherein the translucent exit window has an upstream face with an exit window upstream face area (AEW1) and that the transmissive support has an upstream face with an transmissive support upstream face area (AS1), wherein exit window and transmissive support have a surface area ratio AEW1/A51 in the range of 2-20.

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