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Full-wave simulation of enhanced outcoupling of organic light-emitting devices with an embedded low-index grid
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FIG. 1.

(a) (Top) Schematic illustration of the embedded LIG. (Bottom) A diagram of the approximate correspondence of sections of the modeled hemisphere to each set of modes. [(b)–(e)] Simulated power intensity through the curved surface of the simulation domain for vertical and horizontal dipole orientations, with and without the LIG. (b) Vertical dipole without LIG. (c) Horizontal dipole without LIG. (d) Vertical dipole with LIG. (e) Horizontal dipole with LIG. In (b) and (d) the full range of values is not shown to demonstrate features; the vast majority of light is in the white center of the disk.

Image of FIG. 2.

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FIG. 2.

(a) Simulated fraction of emitted power in modes vs wavelength. The enhancement factor is defined as the ratio of modes in the LIG device to modes in the conventional OLED. (b) Simulated fraction of emitted power in modes vs the width of the LIG. (c) Simulated fraction of emitted power in modes vs the width of the organic region. (d) Simulated fraction of emitted power in modes vs the refractive index of the LIG material.

Image of FIG. 3.

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FIG. 3.

Comparison between the experimental results in Ref. 2 and roughly equivalent simulated devices. The results of the simulation closely match the experimental device with a LIG; however, the simulated control device performs significantly better than the experimental control, yielding a lower enhancement factor than that in Ref. 2 .

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/content/aip/journal/apl/94/16/10.1063/1.3116644
2009-04-20
2014-04-25

Abstract

Enhancement of light outcoupling into substrate modes by a grid of low-refractive-index material embedded into the organic layer of an organic light-emitting device (OLED) is analyzed using full-wave electromagnetic simulations. The low-index grid (LIG) redirects modes normally trapped within the high-index organic and indium tin oxide layers (waveguide modes) into the substrate where they can be further extracted into free space using methods such as microlens arrays or roughened surfaces. This increases the external quantum and power efficiencies without affecting the electroluminescent spectrum. The dependence on grid geometry, dimensions, and refractive index is explored to optimize the structure. Simulations show that up to 50% more light can be extracted from the high-index region using an ultralow-index grid than a conventional device, and provided efficient substrate-to-air outcoupling, the external quantum efficiencies of LIG OLEDs can reach .

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Scitation: Full-wave simulation of enhanced outcoupling of organic light-emitting devices with an embedded low-index grid
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/16/10.1063/1.3116644
10.1063/1.3116644
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