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Improving efficiency roll-off in organic light emitting devices with a fluorescence-interlayer-phosphorescence emission architecture
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Figures

Image of FIG. 1.

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FIG. 1.

The absorption and photoluminescence spectra of two guests and two hosts, respectively. Inset: the chemical structure of .

Image of FIG. 2.

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FIG. 2.

Luminance efficiency-current density (a) and current density-voltage (b) characteristics of FIP and two control OLEDs; curves of hole-only device (c) with structures of ITO/NPB/NPB/Au/Al (square) and ITO/NPB/NPB:C545T/Au/Al (triangle), and electron-only devices (d) with structures of ITO/NPB/NPB/TPBi/LiF/Al (square) and ITO/NPB/NPB:C545T/TPBi/LiF/Al (triangle).

Image of FIG. 3.

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FIG. 3.

Energy level scheme of the FIP OLED, and three arrows represent the possible paths of exciton movement in recombination zone.

Image of FIG. 4.

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FIG. 4.

Electroluminescence spectra of the FIP OLEDs and two control devices. Inset: image of FIP3 device driven at 8 V.

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/content/aip/journal/apl/95/13/10.1063/1.3241079
2009-10-02
2014-04-17

Abstract

Organic light emitting devices(OLEDs) with a fluorescence-interlayer-phosphorescence emission layer structure (FIP EML) has been proposed to solve the efficiency roll-off issue effectively. Efficient green OLED based on FIP EML exhibiting only 26% roll-off in the luminance efficiency, which is lower than the typical roll-off of 51% for conventional phosphorescent OLEDs with single EML operated at range, has been demonstrated. Such enhancement should be attributed to the improved carrier balance, the exciton redistribution in recombination zone, the suppression of nonradiative exciton quenching processes, and the elimination of energy transfer loss offered by the FIP EML structure.

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Scitation: Improving efficiency roll-off in organic light emitting devices with a fluorescence-interlayer-phosphorescence emission architecture
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/13/10.1063/1.3241079
10.1063/1.3241079
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