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Efficient hybrid organic-inorganic light emitting diodes with self-assembled dipole molecule deposited metal oxides
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Figures

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FIG. 1.

(a) Device architecture of single F8BT layer HyPLEDs with SADMs on a ZnO surface. (b) Chemical structures of carboxylic acid based SADMs: (i) negative dipole molecules: , and , (ii) positive dipole molecules: BA-SH and BA-CN.

Image of FIG. 2.

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FIG. 2.

Schematic energy diagrams for flat band conditions of HyPLEDs with (a) unmodified ZnO, (b) negative, and (c) positive SADM modified ZnO. (d) Experimentally measured work functions of ZnO as a function of the using UPS.

Image of FIG. 3.

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FIG. 3.

J-V-L characteristics for SADM-modified ZnO layer in HyPLEDs.

Tables

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Table I.

Detailed device characteristics of HyPLEDs without or with SADM modification of ZnO.

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/content/aip/journal/apl/96/24/10.1063/1.3453759
2010-06-16
2014-04-20

Abstract

We investigate the effect of self-assembled dipole molecules (SADMs) on ZnOsurface in hybridorganic-inorganicpolymeric light-emitting diodes (HyPLEDs). Despite the SADM being extremely thin, the magnitude and orientation of SADM dipole moment effectively influenced the work function of the ZnO. As a consequence, the charge injection barrier between the conduction band of the ZnO and the lowest unoccupied molecular orbital of poly(-dioctylfluorene)-co-benzothiadiazole could be efficiently controlled resulting that electron injection efficiency is remarkably enhanced. The HyPLEDs modified with a negative dipolar SADM exhibited enhanced device performances, which correspond to approximately a fourfold compared to those of unmodified HyPLEDs.

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Scitation: Efficient hybrid organic-inorganic light emitting diodes with self-assembled dipole molecule deposited metal oxides
http://aip.metastore.ingenta.com/content/aip/journal/apl/96/24/10.1063/1.3453759
10.1063/1.3453759
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