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Low index spacer layer in LED devices

  • US 8,637,883 B2
  • Filed: 03/19/2008
  • Issued: 01/28/2014
  • Est. Priority Date: 03/19/2008
  • Status: Active Grant
First Claim
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1. A light emitting diode (LED) device, comprising:

  • an LED chip on a mount surface, said LED chip comprising sidewalls and a textured light emission surface, said LED chip having a first index of refraction;

    a reflective element opposite said textured light emission surface such that said reflective element is between said LED chip and said mount surface;

    a spacer layer disposed on said LED chip and covering said light emission surface and said sidewalls, said spacer layer having a second index of refraction that is smaller than said first index of refraction; and

    at least one functional layer comprising a wavelength conversion layer disposed on said spacer layer, said wavelength conversion layer comprising a binder material embedded with a plurality of phosphor particles, said phosphor particles having a third index of refraction that is larger than said second index of refraction, wherein said binder material has a substantially similar index of refraction to said phosphor particles;

    wherein said spacer layer and said functional layer are conformal to said LED chip.

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