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Encapsulated RGB OLEDs having enhanced optical output

  • US 9,337,446 B2
  • Filed: 12/22/2008
  • Issued: 05/10/2016
  • Est. Priority Date: 12/22/2008
  • Status: Active Grant
First Claim
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1. A method of making an integrated barrier and optical enhancement stack for protecting and improving the light out coupling of an encapsulated OLED comprising;

  • providing an OLED having at least two colors selected from red, green, or blue, and a transparent electrode;

    selecting an initial inorganic barrier layer having a refractive index in a range of about 1.55 to about 2, the initial inorganic barrier layer adjacent to the transparent electrode in the OLED;

    providing a thickness of the initial inorganic barrier layer for the OLED within a range of about 40 nm to about 240 nm;

    selecting a barrier stack comprising an inorganic barrier layer and a polymeric decoupling layer, the inorganic barrier layer having a refractive index in a range of about 1.55 to about 2, and the polymeric decoupling layer having a refractive index in a range of about 1.4 to about 1.65, the barrier stack adjacent to the initial inorganic barrier layer;

    providing a thickness of the inorganic barrier layer within a range of about 20 nm to about 80 nm and the polymeric decoupling layer of the barrier stack within a range of about 0.2 μ

    m to about 4 μ

    m;

    optimizing the thickness of at least one of the initial inorganic barrier layer, the inorganic barrier layer, or the polymeric decoupling layer for at least one of maximum efficiency, minimum dispersion, or minimum spectral shift, so that the encapsulated OLED has enhanced light outcoupling compared to a bare OLED, said optimizing being achieved without use of either (a) a scattering layer placed adjacent the OLED, initial inorganic barrier layer or barrier stack or (b) a quarter-wave stack placed adjacent the OLED, initial inorganic barrier layer or barrier stack;

    depositing the initial inorganic barrier layer having the optimized thickness adjacent to the transparent electrode of the OLED; and

    depositing the barrier stack having the optimized thickness adjacent to the initial inorganic layer.

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