Abstract
We have studied the quantum efficiency of multilayer organic light emitting diodes (OLEDs). Attention is focused on the recombination efficiency and exciton quenching, controlling the performance of highly efficient OLEDs having Alq(3) (Al(III) 8-hydroxyquinoline) as the emissive layer. The kinetics model of Ref. [1] is extended to account for the image charge effect on the injection and the narrow bandwidths of carriers. An analytical criterion for maximum recombination efficiency at low voltages is found. The analysis of current voltage dependence and quantum efficiency is performed for Al/LiF/Alq(3)/TPD/ITO devices with or without an ultrathin dielectric layer LiF, taking into account the exciton quenching controlled by the boundary Al-Alq(3). We get a reasonable fit for the experimental data and discuss the optimum modifications required to enhance the device performance.
Original language | English (US) |
---|---|
Pages (from-to) | 142-143 |
Number of pages | 2 |
Journal | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 3749 |
State | Published - Jan 1 1999 |
Event | Proceedings of the 1999 18th Congress of the International Commission for Optics (ICO XVIII): Optics for the Next Millennium - San Francisco, CA, USA Duration: Aug 2 1999 → Aug 6 1999 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering