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HL: Fachverband Halbleiterphysik
HL 7: Poster I
HL 7.22: Poster
Montag, 27. März 2023, 13:00–15:00, P2/EG
Multiphoton absorption induced photoluminescence in CuI — •Andreas Müller1, Sebastian Henn1, Evgeny Krüger1, Steffen Blaurock2, Harald Krautscheid2, Marius Grundmann1, and Chris Sturm1 — 1Felix-Bloch-Institut für Festkörperphysik, Universität Leipzig, Linnéstr. 5, 04103 Leipzig, Germany — 2Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany
Two- and three-photon absorption induced photoluminescence (2PAPL, 3PAPL) are nonlinear optical processes useful for energy upconversion or, in contrast to near-to-the-surface single-photon absorption, excitation within the bulk material.
In this work, we report on low temperature (30 K) 2PAPL and 3PAPL in transparent conducting CuI crystals (Eg=3.1 eV), analyzed employing excitation energy and density-dependent, steady-state, and time-resolved photoluminescence. Using an excitation energy that corresponds to half of the bandgap energy, the observed intensity dependence on the excitation power shows an almost parabolic behavior. By a further reduction of the photon energy, the cubic contribution of the excitation power on the intensity increases, and for low excitation energies, an almost cubic behavior is obtained. We describe the experimental findings, taking into account the sum of the two- and three-photon transition rates and including the Gaussian spectral intensity distribution of the laser. Through this analysis, the ratio of the cross-sections for the two- and three-photon absorption is estimated to be 10−5 cm2/s.