Journal
APPLIED PHYSICS LETTERS
Volume 88, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2187408
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We report fluorescence imaging of extremely large planar polymer light-emitting electrochemical cells (LECs) with high spatial and temporal resolution. The type of cation used has been shown to strongly affect n-doping propagation. When left to relax, p doping undergoes significantly faster relaxation than n doping. Imaging also confirms that a p-n junction, rather than a p-i-n junction, is formed in fully turned on LECs, which suffer from heavy photoluminescence quenching throughout the polymer film. However, a p-i-n junction with a much less quenched intrinsic region can be formed by relaxing a p-n junction without bias, suggesting a simple approach for achieving more efficient LECs.
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