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Exciplex current mechanism for ambipolar bilayer organic light emitting diodes
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Figures

Image of FIG. 1.

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FIG. 1.

Current-voltage characteristics for different energy level offsets with no exciplex recombination. The lines are total device currents with  = 0.1 eV, 0.4 eV, 0.6 eV, and 0.8 eV, respectively. The corresponding circles are the total recombination currents in the semiconductor. The corresponding built-in potentials are  = 1.8 V, 1.5 V, 1.3 V, and 1.1 V. The inset shows the schematic band diagram.

Image of FIG. 2.

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FIG. 2.

Current-voltage characteristics with different exciplex recombination coefficient, . The lines are total device currents with , , , and 0, respectively. The corresponding circles are total recombination currents in the semiconductor. The inset shows the schematic band diagram.

Image of FIG. 3.

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FIG. 3.

The total current, bulk recombination current, and exciplex recombination current with different and . The lines, triangles, and circles denote the total current, bulk recombination current, and exciplex recombination current, respectively.

Image of FIG. 4.

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FIG. 4.

Current-voltage characteristics with different exciplex relaxation times, . The lines, triangles, and circles denote the total current, bulk recombination current, and exciplex recombination current, respectively. The solid line and filled symbols correspond to ; the dotted line and open symbols correspond to . . The inset shows the HOMO energy levels at V = 2.5 V for the two cases.

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/content/aip/journal/apl/99/12/10.1063/1.3640232
2011-09-19
2014-04-17

Abstract

The effect of exciplex dynamics on the current in a bilayer organic light emitting diode with ambipolar injection is explored. Exciplex formation facilitates intermolecular electron-hole recombination across the interface. We discuss the characteristics of the exciplex recombination current with respect to different energy level alignments, interface recombination rates, and exciplex relaxation lifetimes, using a model device consisting of a /tetracene bilayer.

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Scitation: Exciplex current mechanism for ambipolar bilayer organic light emitting diodes
http://aip.metastore.ingenta.com/content/aip/journal/apl/99/12/10.1063/1.3640232
10.1063/1.3640232
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