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TitleSemiconductor Seeded Nanorods with Graded Composition Exhibiting High Quantum-Yield, High Polarization, and Minimal Blinking
AuthorIdo Hadar † , John P. Philbin ‡, Yossef E. Panfil †, Shany Neyshtadt §, Itai Lieberman ∥, Hagai Eshet ⊥#, Sorin Lazar ∇, Eran Rabani *‡⊥, and Uri Banin *†
Affiliation(s)† The Institute of Chemistry and Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel ‡ Department of Chemistry, University of California and Lawrence Berkeley National Laboratory, Berkeley, California 94720-1460, United States § Qlight Nanotech Ltd. (Merck KGaA), Edmond J. Safra Campus, Danciger Building A, POB: 39082, 9139002 Jerusalem, Israel ∥ Merck KGaA, Performance Materials, Advanced Technologies, OLED & Quantum Materials, Frankfurter Straße 250, 64293 Darmstadt, Germany ⊥ The Sackler Institute for Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv, Israel 69978 # School of Chemistry, Tel Aviv University, Tel Aviv, Israel 69978 ∇ FEI Company, Achtseweg Noord 5, 5651 GG Eindhoven, The Netherlands
PublishedNano Lett., 2017, 17 (4), pp 2524–2531 DOI: 10.1021/acs.nanolett.7b00254
Keywordelectronic structure; fluorescence spectroscopy; heterostructures; Nanorods; seeded growth; synthesis
Snippet 
AbstractSeeded semiconductor nanorods represent a unique family of quantum confined materials that manifest characteristics of mixed dimensionality. They show polarized emission with high quantum yield and fluorescence switching under an electric field, features that are desirable for use in display technologies and other optical applications. So far, their robust synthesis has been limited mainly to CdSe/CdS heterostructures, thereby constraining the spectral tunability to the red region of the visible spectrum. Herein we present a novel synthesis of CdSe/Cd1–xZnxS seeded nanorods with a radially graded composition that show bright and highly polarized green emission with minimal intermittency, as confirmed by ensemble and single nanorods optical measurements. Atomistic pseudopotential simulations elucidate the importance of the Zn atoms within the nanorod structure, in particular the effect of the graded composition. Thus, the controlled addition of Zn influences and improves the nanorods’ optoelectronic performance by providing an additional handle to manipulate the degree confinement beyond the common size control approach. These nanorods may be utilized in applications that require the generation of a full, rich spectrum such as energy-efficient displays and lighting.

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