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Efficient single layer solution-processed blue-emitting electrophosphorescent devices based on a small-molecule host
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Figures

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FIG. 1.

The configuration (a) and energy level diagrams (b) of the devices used in this study.

Image of FIG. 2.

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FIG. 2.

The absorption spectrum of FIrpic and the PL and EL spectra of different concentrations of FIrpic-doped TBCPF:OXD-7 (2:1) thin film. The inset shows the chemical structure of TBCPF.

Image of FIG. 3.

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FIG. 3.

(a) Luminance–current density–voltage curves for the devices with varied concentration of FIrpic doped into TBCPF:OXD-7 (2:1) emission layers. The device configuration is ITO/PEDOT:PSS/TBCPF:OXD-7: FIrpic . Luminance is displayed with open symbols and current density with solid symbols. (b) Luminous efficiency–current density curves of the same devices.

Image of FIG. 4.

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FIG. 4.

Luminous efficiency–current density curves of the devices with FIrpic and different TBCPF:OXD-7 ratios.

Tables

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Table I.

The performances of single layer devices with FIrpic and different TBCPF:OXD-7 ratios. The device configuration is ITO/PEDOT:PSS/TBCPF:OXD-7:FIrpic .

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/content/aip/journal/apl/92/26/10.1063/1.2952483
2008-06-30
2014-04-20

Abstract

We report highly efficient single layer solution-processed blue small-molecule electrophosphorescent organic light-emitting diodes with iridium (III) bis[2-(4,6-difluorophenyl)-pyridinato-]picolinate (FIrpic) doped into a wide-gap 9,9-bis[4-(3 c6-di-tert-butylcarbazol-9-yl)phenyl]fluorene (TBCPF) as the emission layer. An optimized device with 1,3-bis[(4-tert-butylphenyl)-1,3,4-oxidiazolyl]phenylene as the electron-transporting component doped into the emission layer, with a blue electrophosphorescence peaked at from FIrpic, shows a maximum luminance efficiency of at and brightness of at . We attribute the high performance to the excellent film forming ability and high triplet energy of TBCPF.

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Scitation: Efficient single layer solution-processed blue-emitting electrophosphorescent devices based on a small-molecule host
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/26/10.1063/1.2952483
10.1063/1.2952483
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