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Effect of ionic space charge polarization on the charge injection of molecularly doped polymer light emitting diodes

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2 Author(s)
Itoh, Eiji ; Dept. of Electr. & Electron. Eng., Shinshu Univ., Nagano, Japan ; Miyairi, K.

In this study, we report the effect of lithium perchlorate (LiClO 4) doping with only about 1 wt% on the electrical properties and luminance of heat-treated polymer-based LED obtained by molecular dispersion of tris (8-hydroxyquinoline) aluminium (Alq3) [or 2-(4-Biphenyl)-5-(4tert-butyl-phenyl)-1, 3, 4-oxadiazole (BuBPD)] and Coumarin6 (C6) in poly (N-vinylcarbazole) (PVCz). We compare the current-voltage (I-V) and the luminance-voltage (L-V) characteristics of the devices with or without LiClO4. We also investigate the effect of prebiasing on the electrical conduction of the molecularly doped polymer films

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Solid Dielectrics, 2001. ICSD '01. Proceedings of the 2001 IEEE 7th International Conference on

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