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Solution processable ionic phosphorescent organic light-emitting diodes
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FIG. 1.

(a) Architecture of the devices with the simultaneous electrical and thermal treatments. (b) Schematic energy levels of the device after the simultaneous treatments.

Image of FIG. 2.

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FIG. 2.

(a) A photograph of the operating sample device (right) and reference device (left). Normalized EL spectra (b) and the dynamic responses (c) for the operating sample device and reference device.

Image of FIG. 3.

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FIG. 3.

Characteristics of (a) and (b) for the single-layered ionic PHOLEDs with various concentrations of doped salt of .

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/content/aip/journal/apl/93/9/10.1063/1.2963032
2008-09-03
2014-04-23

Abstract

We report efficient light-emission from solution-processed single-layered phosphorescent organic light-emitting diodes (PHOLEDs) that were doped with ionic salt and treated with simultaneous electrical and thermal annealing. Because the simultaneous annealing causes the adsorption of salt ions at the electrode surfaces, the energy levels of the organic molecules are bent by the electric fields due to the adsorbed ions; i.e., the annealing can induce the proper formation of an ionic structure. As a result, an ionic PHOLED with a peak luminescence of over and a power efficiency of was achieved through increased and balanced carrier injections.

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Scitation: Solution processable ionic p-i-n phosphorescent organic light-emitting diodes
http://aip.metastore.ingenta.com/content/aip/journal/apl/93/9/10.1063/1.2963032
10.1063/1.2963032
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