Title :
Effect of ionic space charge polarization on the charge injection of molecularly doped polymer light emitting diodes
Author :
Itoh, Eiji ; Miyairi, Ken
Author_Institution :
Dept. of Electr. & Electron. Eng., Shinshu Univ., Nagano, Japan
fDate :
6/23/1905 12:00:00 AM
Abstract :
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
Keywords :
charge injection; dielectric polarisation; electrical conductivity; heat treatment; light emitting diodes; optical polymers; polymer films; space charge; Alq3; BuBPD; Coumarin6; LiClO4; charge injection; current-voltage characteristics; electrical conduction; heat treatment; ionic space charge polarization; light emitting diode; lithium perchlorate doping; luminance-voltage characteristics; molecularly doped polymer film; poly(N-vinylcarbazole); Aluminum; Dispersion; Doping; Light emitting diodes; Lithium compounds; Organic light emitting diodes; Polarization; Polymer films; Resistance heating; Space charge;
Conference_Titel :
Solid Dielectrics, 2001. ICSD '01. Proceedings of the 2001 IEEE 7th International Conference on
Conference_Location :
Eindhoven
Print_ISBN :
0-7803-6352-3
DOI :
10.1109/ICSD.2001.955520
