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The effect of heat-treatment and lithium perchlorate (LiClO4) doping on the electrical and luminance properties of the poly (N-vinylcarbazole) film mixed with electron transporting material (BuPBD or Alq3) and Coumarin6 was investigated in this study. It was found that the efficiencies of the light emitting diode with and without LiClO4 were improved by heat-treatment in the vacuum. It was also found that the charge injection was enhanced by the small amount of LiClO4 doping, and the luminance and the current density of the film with LiClO4 were improved by the pre-biasing under the high electric field, and it was ascribed to the ionic charge polarization at the electrode/film interface.

Effect of ionic charge polarization on device properties of the molecularly doped poly (N-vinylcarbazole)light emitting diode