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Marked improvement in electroluminescence characteristics of organic light-emitting diodes using an ultrathin hole-injection layer of molybdenum oxide
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10.1063/1.2974089
/content/aip/journal/jap/104/5/10.1063/1.2974089
http://aip.metastore.ingenta.com/content/aip/journal/jap/104/5/10.1063/1.2974089
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Figures

Image of FIG. 1.
FIG. 1.

Schematic structures of (a) OLEDs and (b) hole-only devices with various thicknesses of HIL and (c) energy-level diagram of OLEDs before making contact between each layer. The thickness of HIL inserted between ITO and was varied from 0 to 10 nm.

Image of FIG. 2.
FIG. 2.

(a) Current density-voltage characteristics of OLEDs with various thicknesses of HIL and (b) driving voltage at current densities of 1, 10, and vs thickness of OLEDs.

Image of FIG. 3.
FIG. 3.

External quantum efficiency at current densities of 1, 10, and vs thickness of OLEDs.

Image of FIG. 4.
FIG. 4.

Power conversion efficiency at current densities of 1, 10, and vs thickness of OLEDs.

Image of FIG. 5.
FIG. 5.

(a) Luminance/initial luminance-time characteristics of OLEDs with various thickness of HIL and (b) 90% lifetime and electric power vs thickness of OLEDs. All OLEDs were operated at constant dc current density of .

Image of FIG. 6.
FIG. 6.

(a) Current density-voltage characteristics of hole-only devices with various thickness of HIL and (b) driving voltage at current densities of 10, 100, and vs thickness of hole-only devices. Solid line in (a) represents SCLC expressed as , where is current density, is relative permittivity (3.0), is vacuum permittivity , is carrier mobility , is voltage, and is cathode-anode spacing (100 nm). (Ref. 22)

Image of FIG. 7.
FIG. 7.

Work functions of glass/ITO samples as a function of thickness . The thickness of layer on ITO was varied from 0 to 10 nm.

Image of FIG. 8.
FIG. 8.

Atomic force microscope images of glass/ITO samples: (a) , (b) , (c) , and (d) .

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/content/aip/journal/jap/104/5/10.1063/1.2974089
2008-09-02
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Marked improvement in electroluminescence characteristics of organic light-emitting diodes using an ultrathin hole-injection layer of molybdenum oxide
http://aip.metastore.ingenta.com/content/aip/journal/jap/104/5/10.1063/1.2974089
10.1063/1.2974089
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