Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 105, Issue 35, Pages 12730-12735Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0806494105
Keywords
conjugated polyelectrolytes; ion motion; polymer light-emitting diodes; electron transporting layer; charge injection
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Funding
- National Science Foundation [DMR 0547639, DMR-0602280, DMR-0606414, DMR0520415]
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We show that polymer light-emitting diodes with high work-function cathodes and conjugated polyelectrolyte injection/transport layers exhibit excellent efficiencies despite large electron-injection barriers. Correlation of device response times with structure provides evidence that the electron-injection mechanism involves redistribution of the ions within the polyelectrolyte electron-transport layer and hole accumulation at the interface between the emissive and electron-transport layers. Both processes lead to screening of the internal electric field and a lowering of the electron-injection barrier. The hole and electron currents are therefore diffusion currents rather than drift currents. The response time and the device performance are influenced by the type of counterion used.
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