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Highly efficient red organic light-emitting devices based on a fluorene-triphenylamine host doped with an Os(II) phosphor
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Figures

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FIG. 1.

Chemical structures of TFTPA and , and a schematic illustration of the device configuration used in this study.

Image of FIG. 2.

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FIG. 2.

EL spectrum of the of -doped TFTPA device. Inset: Energy level diagram of the device.

Image of FIG. 3.

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FIG. 3.

Plots of current density (open symbols) and brightness (soild symbols) with respect to voltage for TFTPA-based devices at various doping concentrations.

Image of FIG. 4.

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FIG. 4.

Plots of external quantum efficiency and power efficiency with respect to current density for the TFTPA-based devices at various doping concentrations.

Image of FIG. 5.

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FIG. 5.

AFM topographic images (tapping mode) of the -doped (a) CBP and (b) TFTPA films.

Tables

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Table I.

EL properties of TFTPA-based devices.

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/content/aip/journal/apl/92/23/10.1063/1.2943155
2008-06-11
2014-04-23

Abstract

We report highly efficient red-light-emitting devices based on a fluorene-triphenylamine tris[4-(9-phenylfluoren-9-yl)phenyl]amine (TFTPA) host doped with an osmiumphosphor. The sterically hindered fluorene peripheries provided a compatible environment for the osmiumdopant and alleviated concentration quenching of the phosphor at high doping levels. Increasing the doping concentration from dramatically decreased the driving voltage of the TFTPA-based devices, leading to improved power efficiency. The Os-doped device exhibited maximum luminous and powder efficiencies of and , combined with high efficiencies at high brightness. At the efficiencies remained and .

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Scitation: Highly efficient red organic light-emitting devices based on a fluorene-triphenylamine host doped with an Os(II) phosphor
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/23/10.1063/1.2943155
10.1063/1.2943155
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