Effect of dye doping on the charge carrier balance in PPV light emitting diodes as measured by admittance spectroscopy

Details Effect of dye doping on the charge carrier balance in PPV light emitting diodes as measured by admittance spectroscopy Effect of dye doping on the charge carrier balance in PPV light emitting diodes as measured by admittance spectroscopy

2003-06-27

arxiv.org/abs/cond-mat/0306702v1

Physics

Condensed Matter

Materials Science

3 pages, 3 figures

Scientific paper

10.1063/1.1600850

Dye doping is a promising way to increase the spectral purity of polymer light-emitting diodes (LEDs). Here we analyze the frequency and field dependence of the complex admittance of Al-Ba-PPV-PEDOT-ITO LEDs with and without dye. We compare the charge carrier mobilities of pristine and dye-doped double-carrier and hole-only (Au replacing Al-Ba) devices. Dye doping is shown to significantly influence the electron mobilities while the hole mobilities are left unchanged and thereby changing the carrier balance in a double carrier device towards that of a hole only device. The minimum in the LED capacitance as function of voltage appears to be an excellent probe for the electron trapping phenomenon underlying the reduction of the mobility.

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