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Article comprising a microcavity light source

  • US 5,674,636 A
  • Filed: 09/13/1995
  • Issued: 10/07/1997
  • Est. Priority Date: 05/20/1994
  • Status: Expired due to Term
First Claim
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1. An article comprising a layer structure on a major surface of a substrate body, said layer structure comprisinga) spaced apart first and second reflectors defining a microcavity of effective optical length L;

  • b) at least one active layer that comprises organic material capable of electroluminescence, and having an electroluminescence spectrum including an emission region, with at least a portion of the active layer disposed between said reflector means; and

    c) electrodes that facilitate flowing a current through the at least portion of the active layer such that the microcavity can be caused to emit radiation;

    CHARACTERIZED IN THATd) the layer structure comprises at least a first and a second active layer, with at least a portion of each of said active layers disposed between said reflector means, and with said first and second active layers having a combined electroluminescence spectrum including an emission region; and

    e) the effective optical length L is selected such that the microcavity is a multimode cavity that simultaneously supports at least two modes of radiation, each of said modes having a wavelength within said emission region of said combined electroluminescence spectrum, such that the microcavity can simultaneously emit radiation of at least two predetermined colors.

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