Dresden 2014 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 85: Organic light emission

HL 85.2: Talk

Thursday, April 3, 2014, 09:45–10:00, POT 006

Electroluminescence of Tamm states in a hybrid OLED/microcavity structure — •Stefan Meister, Robert Brückner, Daniel Kasemann, Hartmut Fröb, and Karl Leo — Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden, Germany

We implemented an organic light emitting diode (OLED) into a high quality microcavity consisting of two distributed Bragg reflectors (DBRs). The OLED is composed of seven different layers. In order to electrically contact the active region it is inevitable to implement two metal layers. The high absorption coefficient of metal, however, limits the thickness and the positioning of these layers inside the microcavity.

Therefore simulations based on the transfer matrix algorithm are performed and the structure of the OLED is optimized to maximize the resulting quality factor of the microcavity.

After designing a suitable structure, the complete sample is realised and both electrically and spectroscopically investigated. Evaluating an electroluminescent spectra clearly shows emission from coupled resonances, so called Tamm states exhibiting quality factors of at least 800.

In summary it is possible to get electroluminescence from an OLED in a microcavity with quite high quality factors.