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Degradation effects in polymer light emitting devices due to heat treatment |
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| Authors: | Frank Janssen Marco Sturm Leo van Ijzendoorn Arnoud Denier van der Gon Herman Schoo Martien de Voigt Hidde Brongersma |
| Institution: | 1. Department of Applied Physics, Eindhoven University of Technology, Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, Netherlands;2. TNO Institute of Industrial Technology, Eindhoven, Netherlands Dutch Polymer Institute, Netherlands |
| Abstract: | 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. |
| Keywords: | annealing conjugated polymer degradation interfaces light emitting diodes (LED) |