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Issue 11, 2012
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High-performance multilayered phosphorescent OLEDs by solution-processed commercial electron-transport materials

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Abstract

Highly efficient multilayered polymer-based phosphorescent organic light-emitting diodes (PhOLEDs) are realized by orthogonal sequential solution-processing of commercial small-molecule electron-transport materials (ETMs), including 1,3,5-tri(3-pyrid-3-yl-phenyl)benzene (TmPyPB), 4,7-diphenyl-1,10-phenanthroline (BPhen) and 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP). The performance of PhOLEDs with solution-deposited ETMs is found to be far superior compared to devices with vacuum-deposited ETMs. PhOLEDs with a solution-deposited BPhen electron-transport layer gave a luminous efficiency of 53.8 cd A−1 with an external quantum efficiency of 16.1%. The solution-processed electron-transport layer exhibits a unique rough surface morphology which facilitates charge-injection and transport from the cathode metal. The nanostructured surface morphology and charge carrier mobility of the solution-processed electron-transport layers could be tuned and controlled by the solution concentration. The orthogonal solution-processing demonstrated here is a promising strategy for applications in various solution-processed multilayered organic electronic devices.

Graphical abstract: High-performance multilayered phosphorescent OLEDs by solution-processed commercial electron-transport materials

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Article information


Submitted
02 Sep 2011
Accepted
19 Dec 2011
First published
26 Jan 2012

J. Mater. Chem., 2012,22, 4660-4668
Article type
Paper

High-performance multilayered phosphorescent OLEDs by solution-processed commercial electron-transport materials

T. Earmme and S. A. Jenekhe, J. Mater. Chem., 2012, 22, 4660
DOI: 10.1039/C2JM14347J

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