Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.011
Publication date: 6th July 2018
We introduce the electronic and exciton dynamic properties of these nanoplatelets and their hetero structures and demonstrate for example that ligand induced strain in these colloidal quantum wells with finite size results in a strong alteration of the transition energies. We show that intrinsically directional light emitters are potentially important for applications in photonics including lasing and energy efficient display technology and propose a new route to overcome intrinsic efficiency limitations in light-emitting devices by studying a CdSe nanoplatelets monolayer that exhibits strongly anisotropic and directed photoluminescence. Our analysis of the two-dimensional k-space distribution of the nanoplatelet absorption and emission reveals the underlying internal transition dipole distribution. The observed directed emission is related to the anisotropy of the electronic Bloch states governing the exciton transition dipole moment and forming a bright plane. The strongly directed emission perpendicular to the platelet is further enhanced by the optical local density of states and local fields. In contrast to the emission directionality, the off-resonant absorption into the energetically higher 2D-continuum of states is isotropic. These contrasting optical properties make the oriented CdSe nanoplatelets, or superstructures of parallel-oriented platelets, an interesting and potentially useful class of semiconductor-based emitters for photonic applications. We also demonstrate by 2D k-space spectroscopy that two-photon absorption (TPA) is highly anisotropic in CdSe nanoplatelets, thus promoting them as a new class of directional two-photon absorbers with extremely large cross sections.
References: 1. Scott and Achtstein et al., Nature Nanotechnology 12, 1155 (2017) 2. Heckmann and Achtstein et al., Nano Letters 17, 6321, (2017) 3. Antanovich and Achtstein et al., Nanoscale, (2017); DOI: 10.1039/c7nr05065h
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