Device structures and materials for organic light-emitting diodes

Dirk Ammermann; Achim Boehler; Siegfried Dirr; Hans-Hermann Johannes; Wolfgang Kowalsky; Walter Grahn

doi:10.1117/12.264215

22 January 1997 Device structures and materials for organic light-emitting diodes

Dirk Ammermann, Achim Boehler, Siegfried Dirr, Hans-Hermann Johannes, Wolfgang Kowalsky, Walter Grahn

Proceedings Volume 3006, Optoelectronic Integrated Circuits; (1997) https://doi.org/10.1117/12.264215
Event: Photonics West '97, 1997, San Jose, CA, United States

Abstract

Organic light emitting devices (OLEDs) are promising candidates for light-weight color flat panel displays. Different device structures with emission in the blue, green, and red spectral region are discussed with respect to their optical and electrical characteristics. Blue OLEDs based on OXD-8 as emitter molecule show quantum efficiencies of 0.9% (2.2 cd/A, 0.6 lm/W), green emitting devices based on Alq₃ achieve values of 1.4% (4.9 cd/A, 1.3 lm/W). Electroluminescence with colors tunable from yellow-green to red is obtained with DCM doped Alq₃ layers. To investigate the device physics, a thin DCM:Alq₃ sensor film is inserted into an Alq₃ emitter layer. Position and current dependent spectral characteristics allow to explain the device behavior. Carrier injection, transport, recombination, exciton diffusion and decay are identified as the crucial processes responsible for the operation of OLEDs.

Citation Download Citation

Dirk Ammermann, Achim Boehler, Siegfried Dirr, Hans-Hermann Johannes, Wolfgang Kowalsky, and Walter Grahn "Device structures and materials for organic light-emitting diodes", Proc. SPIE 3006, Optoelectronic Integrated Circuits, (22 January 1997); https://doi.org/10.1117/12.264215

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