Controlling the Emission Properties of Quantum Rods via Multiscale 3D Ordered Organization

Thomas Bizien (1, 2, 3) , Marie Postic (1, 2) , Pascale Even-Hernandez (2) , Pascal Panizza (1) , Cristelle Mériadec (1) , Florian Meneau (3, 4) , Elsa Mazari-Arrighi (5) , Christophe Dupuis (5) , Charlie Gosse (5) , Mircea Cotlet (6) , Oleg Gang (7, 6) , Valérie Marchi (2) , Franck Artzner (1)

1 IPR - Institut de Physique de Rennes
2 ISCR - Institut des Sciences Chimiques de Rennes
3 SSOLEIL - Synchrotron SOLEIL
4 LNLS - Laboratório Nacional de Luz Sìncrotron
5 LPN - Laboratoire de photonique et de nanostructures
6 BNL - Brookhaven National Laboratory [Upton, NY]
7 Columbia University [New York]

A specific organization of optically active nanoscale objects can greatly affect the optical response of a system. Here, we report the controlled modification of the fluorescent emission by the assembly of water-soluble quantum rods (QRs). Our study combines optical, electron microcopy, and X-ray scattering characterizations to reveal a correlation between the self-assembly behavior of QRs into ordered 3D-arrays and the optical properties (luminescence) of formed assemblies, where the observed optical response is highly dependent on the QR aspect ratio. Specifically, shorter, 18 nm long QRs (QR18), exhibiting a well-defined smectic packing, demonstrate an enhancement of the emission intensity accompanied by a red shift and a lifetime reduction. In contrast, 40 nm long QRs (QR40), forming a columnar phase, does not show these optical properties.

Domaines: Chimie; Physique [physics]

Thomas Bizien, Marie Postic, Pascale Even-Hernandez, Pascal Panizza, Cristelle Mériadec, et al.. Controlling the Emission Properties of Quantum Rods via Multiscale 3D Ordered Organization. Journal of Nanomaterials, 2021, 2021, pp.1-9. ⟨10.1155/2021/1790976⟩. ⟨hal-03463109⟩