期刊
APPLIED PHYSICS LETTERS
卷 94, 期 3, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3069279
关键词
electroabsorption; light emitting diodes; polymer electrolytes
资金
- National Science Foundation via Jackson State University
- University of California, Santa Barbara under Award [DMR0611539]
Electroabsorption spectroscopy was used to directly probe the electric fields in a polymer light emitting diode that utilizes a conjugated polyelectrolyte electron transporting/injection layer. The electric field in the emitting layer was found to be negligible at applied biases greater than the built-in field of the device. Holes injected at these biases accumulate at the emitting layer/conjugated polyelectrolyte interface and screen the field from the emitting layer to the conjugated polyelectrolyte layer. In conjunction with mobile ions that redistribute the field in the conjugated polyelectrolyte layer, this leads to greatly improved electron injection from high work function cathodes.
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