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Title: Thickness-tunable self-assembled colloidal nanoplatelet films enable ultrathin optical gain media
Authors: Erdem, Onur
Foroutan, Sina
Gheshlaghi, Negar
Guzelturk, Burak
Altintas, Yemliha
Demir, Hilmi Volkan
Keywords: Science::Physics::Optics and light
Issue Date: 2020
Source: Erdem, O., Foroutan, S., Gheshlaghi, N., Guzelturk, B., Altintas, Y. & Demir, H. V. (2020). Thickness-tunable self-assembled colloidal nanoplatelet films enable ultrathin optical gain media. Nano Letters, 20(9), 6459-6465.
Journal: Nano Letters
Abstract: We propose and demonstrate construction of highly uniform, multilayered superstructures of CdSe/CdZnS core/shell colloidal nanoplatelets (NPLs) using liquid interface self-assembly. These NPLs are sequentially deposited onto a solid substrate into slabs having monolayer-precise thickness across tens of cm2 areas. Because of near-unity surface coverage and excellent uniformity, amplified spontaneous emission (ASE) is observed from an uncharacteristically thin film having 6 NPL layers, corresponding to a mere 42 nm thickness. Furthermore, systematic studies on optical gain of these NPL superstructures having thicknesses ranging from 6 to 15 layers revealed the gradual reduction in gain threshold with increasing number of layers, along with a continuous spectral shift of the ASE peak (∼18 nm). These observations can be explained by the change in the optical mode confinement factor with the NPL waveguide thickness and propagation wavelength. This bottom-up construction technique for thickness-tunable, three-dimensional NPL superstructures can be used for large-area device fabrication.
ISSN: 1530-6992
DOI: 10.1021/acs.nanolett.0c02153
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
School of Materials Science and Engineering 
Research Centres: LUMINOUS! Centre of Excellence for Semiconductor Lighting & Displays 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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