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Analysis of the current-voltage characteristics of polymer-based organic light-emitting diodes (OLEDs) deposited by spin coating - 2010
| Content Provider | Open Access Library (OALib) |
|---|---|
| Author | Pardo-Pardo Diana Rocío Salcedo-Reyes Juan Carlos Páez-Sierra Beynor Antonio Méndez-Pinzón Henry Alberto Cuéllar-Alvarado Juan Pablo Vera Ricardo |
| Abstract | polymer-based organic light-emitting diodes (oleds) with the structure ito / pedot:pss / mdmo-ppv / metal were prepared by spin coating. it is known that electroluminescence of these devices is strongly dependent on the material used as cathode and on the deposition parameters of the polymer electroluminescent layer mdmo-ppv. objective. in this work the effect of i) the frequency of the spin coater (1000-8000 rpm), ii) the concentration of the mdmo-ppv: toluene solution, and iii) the material used as cathode (aluminium or silver) on the electrical response of the devices, was evaluated through current-voltage (i-v) measurements. materials and methods. pedot:pps and mdmo-ppv organic layers were deposited by spin coating on ito substrates, and the oled structure was completed with cathodes of aluminium and silver. the electric response of the devices was evaluated based on the i-v characteristics. results. diodes prepared with thinner organic films allow higher currents at lower voltages; this can be achieved either by increasing the frequency of the spin coater or by using concentrations of mdmo-ppv: toluene lower than 2% weight. a fit of the experimental data showed that the diodes have two contributions to the current. the first one is attributed to parasitic currents between anode and cathode, and the other one is a parallel current through the organic layer, in which the carrier injection mechanism is mediated by thermionic emission. conclusions. the results of the fitting and the energy level alignment through the whole structure show that ppv-based oleds are unipolar devices, with current mainly attributed to hole transport. |
| ISSN | 01227483 |
| Journal | Universitas Scientiarum |
| Publisher | Pontificia Universidad Javeriana |
| Publisher Date | 2010-01-01 |
| Access Restriction | Open |
| Subject Keyword | Carrier injection Thermionic emission. Organic semiconductors Electroluminescent polymers Pedot:pss Homo Spin coating Mdmo-ppv Oleds Lumo |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
