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HL: Fachverband Halbleiterphysik
HL 38: Organic semiconductors
HL 38.4: Vortrag
Donnerstag, 4. April 2019, 10:15–10:30, H33
Optical and Electrical Investigations of an Organic Microcavity — •Stefan Meister, Robert Brückner, Markas Sudzius, Hartmut Fröb, and Karl Leo — IAPP, TU Dresden, Dresden, Germany
Organic materials are widely used in opto-electronic devices such as the OLED or the organic solar cell. The properties are also very interesting for laser applications. Whereas different types of laser, with an organic active medium, were presented optically pumped, so far, it is not possible to realize an electrically driven organic solid-state laser. There are several obstacles, e.g. potentially high current densities or accumulation of triplet states, which need to be addressed before the more convenient electrical pump process can be realized.
We investigated different kinds of electrically active structures and their potential for laser applications. The results are compared to optically pumped devices to better rate and understand the device performance.
Due to expected current densities in the range of kA/cm2, the use of metal contacts seems to be inevitable. Therefore, optimizing the contacts plays a key role to prevent a decrease in device functionality due to the metals. We realized metal contacts which did not increase the optical lasing threshold and still supply a conductivity of 1.9x105 (Ωcm)−1.