In situ synthesis and macroscale alignment of CsPbBr3 perovskite nanorods in a polymer matrix

Juan He; Andrew Towers; Yanan Wang; Peisen Yuan; Zhang Jiang; Jiangshan Chen; Andre J. Gesquiere; Shin-Tson Wu; Yajie Dong

doi:10.1039/C8NR04895A

In situ synthesis and macroscale alignment of CsPbBr₃ perovskite nanorods in a polymer matrix†

Juan He,

‡^a Andrew Towers,‡^bc Yanan Wang,§‡^b Peisen Yuan,

^d Zhang Jiang,^e Jiangshan Chen,^d Andre J. Gesquiere,*^abcf Shin-Tson Wu

*^a and Yajie Dong

*^abf

Author affiliations

* Corresponding authors

^a College of Optics and Photonics, University of Central Florida, Orlando, Florida, USA
E-mail: yajie.dong@ucf.edu, swu@creol.ucf.edu, andre@ucf.edu

^b NanoScience Technology Center, University of Central Florida, Orlando, Florida, USA

^c Department of Chemistry, University of Central Florida, Orlando, Florida, USA

^d Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, China

^e X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois, USA

^f Department of Materials Science & Engineering, University of Central Florida, Orlando, Florida, USA

Abstract

We report an in situ catalyst-free strategy to synthesize inorganic CsPbBr₃ perovskite nanorods in a polymer matrix (NRs-PM) with good dimensional control, outstanding optical properties and ultrahigh environmental stability. Polarization photoluminescence (PL) imaging with high spatial resolution was carried out for the first time on single nanorod (NR) and shows a relatively high local polarization ratio (∼0.4) consistent with theoretical predictions based on a dielectric contrast model. We further demonstrate that macroscale alignment of the CsPbBr₃ nanorods can be achieved through mechanically stretching the NRs-PM films at elevated temperature, without deteriorating the optical quality of the NRs. A polarization ratio of 0.23 is observed for these aligned NRs-PM films, suggesting their potential as polarized down-converters to increase the light efficiency in liquid crystal display (LCD) backlights.

This article is part of the themed collections: International Year of the Periodic Table : From Pb and Sn Perovskites to the Next Generation and 2018 Nanoscale HOT Article Collection

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Article information

DOI: https://doi.org/10.1039/C8NR04895A
Article type: Communication
Submitted: 16 Jūn. 2018
Accepted: 25 Jūl. 2018
First published: 25 Jūl. 2018

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Nanoscale, 2018,10, 15436-15441

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In situ synthesis and macroscale alignment of CsPbBr₃ perovskite nanorods in a polymer matrix

J. He, A. Towers, Y. Wang, P. Yuan, Z. Jiang, J. Chen, A. J. Gesquiere, S. Wu and Y. Dong, Nanoscale, 2018, 10, 15436 DOI: 10.1039/C8NR04895A

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