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HL: Fachverband Halbleiterphysik
HL 41: Perovskite and photovoltaics III (joint session HL/CPP)
HL 41.2: Vortrag
Mittwoch, 18. März 2020, 09:45–10:00, POT 251
Reaching Efficiency Limts for Blue CsPbBr3 based Light Emitting Diodes — •Tassilo Naujoks1, Thomas Morgenstern1, Carola Lampe2, Alexander Urban2, Matthew Jurow3, Yi Liu3, and Wolfgang Brütting1 — 1University of Augsburg, 86135 Augsburg, Germany — 2Ludwig-Maximilians-Universität München, 80539 Munich, Germany — 3Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
The unique optical properties of lead halide perovskites have drawn significant attention towards their application in light emitting devices. While quantum yield, emission wavelength and stability are already in the focus of many research groups, the orientation of the emissive transition dipoles is rarely investigated.
In this work, we investigate CsPbBr3 nanoplatelets of variable thickness and determine the orientation of their transition dipole moments from thin film radiation patterns.
We use a thickness variation for nanoplatelets reaching from 2 to 6 monolayers to systematically study the tunability of the TDM orientation and the concomitant color shift, while the emission peak stays as narrow as it is for the green emitting nanocubes.
Together with high photoluminescent quantum yields the efficiency limit of lead-halide perovskite based light emitting diodes can be re-estimated.
The present data reveal very promising new efficiency limits, for solution-processed light emitting diodes: A solution-processed, highly efficient blue emitter with strong horizontal orientation can be made of CsPbBr3 nanoplatelets.