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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Poster Session II
CPP 49.52: Poster
Dienstag, 17. März 2020, 14:00–16:00, P1A
Efficiency loss channel determination in colloidal InP-based quantum dot light emitting diodes — •Manuel Engelmayer1, Yohan Kim2, André Geßner2, and Wolfgang Brütting1 — 1Institute of Physics, University of Augsburg, 86135 Augsburg, Germany — 2Fraunhofer Institute for Applied Polymer Research IAP, 14476 Potsdam, Germany
Colloidal quantum dot light emitting diodes have gained huge interest in both academia and industry over the course of the last years. In order to enable high luminances at low voltages with a reasonable energy consumption, the origin of efficiency losses must be clarified and then suppressed. CdSe-based literature shows two major possible loss channels, one being current dependent Auger quenching and the other being field-induced quenching. Unfortunately, purely electrical characterisation is not able to fully specify the respective contributions to the overall efficiency loss.
To gain deeper insights into the loss mechanisms of such quantum dot light emitting diodes, we built an experimental setup for combined electro- and photoluminescent excitation of quantum dots, which allows to simultaneously monitor the electrical and optical device efficiency. By comparing these with the photoluminescent quantum efficiency at an applied reverse bias, we are able to seperate the superimposed effects of Auger and field-dependent efficiency loss.
First results for InP-based core-shell quantum dot light emitting diodes point towards Auger recombination being the dominant efficiency loss mechanism.