Time resolved photoluminescence study of magnetic CdSe/CdMnS/CdS core/multi-shell nanoplatelets

Joseph R. Murphy; Savas Delikanli; Tianmu Zhang; Thomas A. Scrace; Peiyao Zhang; Tenzin Norden; Tim Thomay; Alexander N. Cartwright; Hilmi Volkan Demir; Athos Petrou

doi:10.1117/12.2252266

20 February 2017 Time resolved photoluminescence study of magnetic CdSe/CdMnS/CdS core/multi-shell nanoplatelets

Joseph R. Murphy, Savas Delikanli, Tianmu Zhang, Thomas A. Scrace, Peiyao Zhang, Tenzin Norden, Tim Thomay, Alexander N. Cartwright, Hilmi Volkan Demir, Athos Petrou

Author Affiliations +

Proceedings Volume 10114, Quantum Dots and Nanostructures: Growth, Characterization, and Modeling XIV; 101140R (2017) https://doi.org/10.1117/12.2252266
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

Colloidal semiconductor nanoplatelets (NPLs) are quasi 2D-nanostructures that are grown and processed inexpensively using a solution based method and thus have recently attracted considerable attention. We observe two features in the photoluminescence spectrum, suggesting two possible recombination channels. Their intensity ratio varies with temperature and two distinct temperature regions are identified; a low temperature region (10K < T < 90K) and a high temperature region (90K < T < 200K). This ratio increases with increasing temperature, suggesting that one recombination channel involves holes that are weakly localized with a localization energy of 0.043meV. A possible origin of these localized states are energy-variations in the xy-plane of the nanoplatelet. The presence of positive photoluminescence circular polarization in the magnetically-doped core/multi-shell NPLs indicates a hole-dopant exchange interaction and therefore the incorporated magnetic Manganese ions act as a marker that determines the location of the localized hole states.¹ Time-resolved measurements show two distinct timescales (τ_fast and τ_slow) that can be modeled using a rate equation model. We identify these timescales as closely related to the corresponding recombination times for the channels. The stronger hole localization of one of these channels leads to a decreased electron-hole wave function overlap and thus a decreased oscillator strength and an increased lifetime. We show that we can model and understand the magnetic interaction of doped 2D-colloidal nanoplatelets which opens a pathway to solution processable spin controllable light sources.

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Joseph R. Murphy, Savas Delikanli, Tianmu Zhang, Thomas A. Scrace, Peiyao Zhang, Tenzin Norden, Tim Thomay, Alexander N. Cartwright, Hilmi Volkan Demir, and Athos Petrou "Time resolved photoluminescence study of magnetic CdSe/CdMnS/CdS core/multi-shell nanoplatelets", Proc. SPIE 10114, Quantum Dots and Nanostructures: Growth, Characterization, and Modeling XIV, 101140R (20 February 2017); https://doi.org/10.1117/12.2252266

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