Efficient screening of electron transport material in multilayer organic light-emitting diodes by combinatorial methods

Christoph Schmitz; Peter Poesch; Mukundan Thelakkat; Hans-Werner Schmidt

doi:10.1117/12.372739

17 December 1999 Efficient screening of electron transport material in multilayer organic light-emitting diodes by combinatorial methods

Christoph Schmitz, Peter Poesch, Mukundan Thelakkat, Hans-Werner Schmidt

Author Affiliations +

Proceedings Volume 3797, Organic Light-Emitting Materials and Devices III; (1999) https://doi.org/10.1117/12.372739
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

A combinatorial approach combining vapor deposition of organic molecules and a mask technique was used to prepare on one substrate a matrix of 49 organic light emitting diodes (OLEDs) with different configuration and layer thickness. A landscape library with two orthogonal, linear gradients of an emitter and a hole blocking electron transport material on top of a hole transport layer of constant thickness was prepared. The aim of this experiment was to investigate the influence of an additional electron transport material on the efficiency. Using a semi-automated measurement set-up, the device parameters for each of the 49 OLEDs were evaluated. The existence of an optimum Alq₃ layer thickness for two-layer devices ITO/TPD/Alq₃/Al is confirmed and such an optimized two-layer structure could not be improved by adding an additional hole blocking layer to the optimum Alq₃ layer. But an improvement of photometric efficiency can be obtained by replacing the optimum Alq₃ layer thickness by certain combinations of Alq₃/spiro-Quinoxaline layers.

Citation Download Citation

Christoph Schmitz, Peter Poesch, Mukundan Thelakkat, and Hans-Werner Schmidt "Efficient screening of electron transport material in multilayer organic light-emitting diodes by combinatorial methods", Proc. SPIE 3797, Organic Light-Emitting Materials and Devices III, (17 December 1999); https://doi.org/10.1117/12.372739

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