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Analysis of efficiency characteristics of green phosphorescent organic light-emitting devices
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Figures

Image of FIG. 1.

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FIG. 1.

Current density-voltage curves of green phosphorescent devices.

Image of FIG. 2.

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FIG. 2.

Energy diagram of green phosphorescent devices except the hole injection layer (DNTPD): (a) device I, (b) device II, and (c) device III. The solid and dotted lines in the diagram represent simulated charge distributions in the layers. The energy level of the materials was measured by surface analyzer (Riken-Keiki AC2) and ultraviolet/visible absorption spectroscopy.

Image of FIG. 3.

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FIG. 3.

Luminance efficiency-current density curves of green phosphorescent devices.

Image of FIG. 4.

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FIG. 4.

Normalized electroluminescence spectra of device I with increasing current density.

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/content/aip/journal/apl/93/19/10.1063/1.2998575
2008-11-11
2014-04-21

Abstract

Efficiency characteristics of green phosphorescent organic light-emitting devices (PHOLEDs) with different host materials and device structures were investigated by examining the luminance efficiency-current density curves and electroluminescence spectra. The efficiency of PHOLEDs at low current density as well as at high current density was greatly affected by energy levels and carrier transport properties of the host and hole/electron transporting materials. The devices exhibited high initial luminance efficiency when hole-electron recombination was well confined in the emitting layer (EML). Efficiency roll off with increasing current density was observed as hole-electron recombination and charge balance in EML deteriorated with current density.

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Scitation: Analysis of efficiency characteristics of green phosphorescent organic light-emitting devices
http://aip.metastore.ingenta.com/content/aip/journal/apl/93/19/10.1063/1.2998575
10.1063/1.2998575
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