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Izquierdo E, Robin A, Keuleyan S, Lequeux N, Lhuillier E, Ithurria S. Strongly Confined HgTe 2D Nanoplatelets as Narrow Near-Infrared Emitters. J Am Chem Soc 2016; 138:10496-501. [PMID: 27487074 DOI: 10.1021/jacs.6b04429] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Two-dimensional colloidal nanoplatelets (NPLs), owing to the atomic-level control of their confined direction (i.e., no inhomogeneous broadening), have demonstrated improved photoluminescence (PL) line widths for cadmium chalcogenide-based nanocrystals. Here we use cation exchange to synthesize mercury chalcogenide NPLs. Appropriate control of reaction kinetics enables the 2D morphology of the NPLs to be maintained during the cation exchange. HgTe and HgSe NPLs have significantly improved optical features compared to existing materials with similar band gaps. The PL line width of HgTe NPLs (40 nm full width at half-maximum, centered at 880 nm) is a factor of 2 smaller than typical PbS nanocrystals (NCs) emitting at the same wavelength. The PL has a lifetime of 50 ns, almost 2 orders of magnitude shorter than small PbS colloidal quantum dots (CQDs), and a quantum yield of ∼10%, almost 2 orders of magnitude shorter than small PbS colloidal quantum dots (CQDs). These materials are promising for a large variety of applications spanning from telecommunications to the design of colloidal topological insulators.
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Affiliation(s)
- Eva Izquierdo
- Laboratoire de Physique et d'Étude des Matériaux, PSL Research University, CNRS UMR 8213, ESPCI ParisTech , 10 rue Vauquelin, 75005 Paris, France
| | - Adrien Robin
- Laboratoire de Physique et d'Étude des Matériaux, PSL Research University, CNRS UMR 8213, ESPCI ParisTech , 10 rue Vauquelin, 75005 Paris, France
| | - Sean Keuleyan
- Voxtel, Inc., and CAMCOR 1241, University of Oregon , Eugene, Oregon 97403, United States
| | - Nicolas Lequeux
- Laboratoire de Physique et d'Étude des Matériaux, PSL Research University, CNRS UMR 8213, ESPCI ParisTech , 10 rue Vauquelin, 75005 Paris, France
| | - Emmanuel Lhuillier
- Institut des Nanosciences de Paris, CNRS-UMR 7588, Sorbonne Universités, UPMC Univ Paris 06 , F-75005 Paris, France
| | - Sandrine Ithurria
- Laboratoire de Physique et d'Étude des Matériaux, PSL Research University, CNRS UMR 8213, ESPCI ParisTech , 10 rue Vauquelin, 75005 Paris, France
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