Predictive modeling of the current density and radiative recombination in blue polymer-based light-emitting diodes
| Autor: | Sie Vulto, van Slm Siebe Mensfoort, M Marco Carvelli, Raj René Janssen, R Reinder Coehoorn, Jgje Joris Billen |
|---|---|
| Přispěvatelé: | Molecular Materials and Nanosystems, Macromolecular and Organic Chemistry |
| Rok vydání: | 2011 |
| Předmět: |
Physics
Electron mobility Condensed matter physics Exciton General Physics and Astronomy 02 engineering and technology Electron 021001 nanoscience & nanotechnology 7. Clean energy 01 natural sciences Molecular physics law.invention Polyfluorene chemistry.chemical_compound chemistry law 0103 physical sciences OLED Light emission Spontaneous emission 010306 general physics 0210 nano-technology Light-emitting diode |
| Zdroj: | Journal of Applied Physics, 109(6):064502, 064502-1/8. American Institute of Physics Journal of Applied Physics |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.3553412 |
| Popis: | The results of a combined experimental and modeling study of charge transport, recombination and light emission in blue organic light-emitting diodes (OLEDs) based on a polyfluorene derivative are presented. It is shown that the measured temperature-dependent current-voltage curves and the voltage-dependent current efficiency are accurately described using an OLED device model that is based on the separately determined unipolar electron and hole mobility functions. The recombination rate is calculated using the Langevin formula, including recombination of holes with free as well as trapped electrons. The light emission is obtained from the exciton formation profile using independently determined values of the exciton radiative decay probability, the average dipole orientation, and assuming a fraction of singlet excitons ¿S¿¿ = ¿(22±3)%, close to the quantum-statistical value. No additional free parameter is used. This shows that predictive one-dimensional device modeling of OLEDs is feasible. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|