The characteristics of polymer light emitting diodes (PLEDs) (ITO/PPV/Ca) depend strongly on the conditions during preparation and operation. We studied the effects of heat treatment (during and after preparation) of PLEDs with OC1C10-PPV as active layer. PLEDs showed a reduction of both the current and the light output to 40 % after annealing for only 30 min at 65 °C. Effects on I-V characteristics were studied by measuring single carrier devices (hole- and electron-dominated devices). The current reduction after heat treatment can be ascribed to degradation of the ITO/PPV and the Ca/PPV interfaces.
- conjugated polymer
- light emitting diodes (LED)
Janssen, F., Sturm, M., van IJzendoorn, L., van der Gon, A. D., Schoo, H., de Voigt, M., & Brongersma, H. (2004). Degradation effects in polymer light emitting devices due to heat treatment. Macromolecular symposia, 212(1), 225-230. https://doi.org/10.1002/masy.200450822