Columnar discotics for light-emitting diodes

Volker Stuempflen; Inga Stapff; Joachim Heinz Wendorff

doi:10.1117/12.305418

17 April 1998 Columnar discotics for light-emitting diodes

Volker Stuempflen, Inga Stapff, Joachim Heinz Wendorff

Proceedings Volume 3281, Polymer Photonic Devices; (1998) https://doi.org/10.1117/12.305418
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

Abstract

Polymer and low molar mass liquid crystalline discotic materials display an unusually large hole mobility of the order of 10^-2 cm²/V^S which results from the formation of stacks with a strong one dimensional (pi) - electron overlap. Homogeneous films with the stacks being uniformly oriented along the film normal or perpendicular to it can be prepared by spin coating and multilayer films with a narrow control of the internal structure via Langmuir Blodgett techniques. We have used such discotic materials as hole transport layer in light emitting diodes both in single layer as well as in multilayer devices. The observation is that the onset fields are small compared with amorphous hole conducting materials, that the onset fields depend strongly on the orientation of the molecular stacks and finally that the onset field is significantly decreased and the quantum efficiency increased in the multilayer devices. Quantum well structures are available via the Langmuir Blodgett technique.

Citation Download Citation

Volker Stuempflen, Inga Stapff, and Joachim Heinz Wendorff "Columnar discotics for light-emitting diodes", Proc. SPIE 3281, Polymer Photonic Devices, (17 April 1998); https://doi.org/10.1117/12.305418

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