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Synergistic Path for Dual Anisotropic and Electrically Switchable Emission From a Nanocomposite of CsPbBr3 Quantum Cuboids and Nematic Liquid Crystal

1
Centre for Nano and Soft Matter Sciences, Bengaluru 560013, India
2
Department of Physics, Mangalore University, Mangalagangotri 574199, India
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(8), 378; https://doi.org/10.3390/cryst9080378
Received: 4 July 2019 / Revised: 19 July 2019 / Accepted: 20 July 2019 / Published: 24 July 2019
(This article belongs to the Special Issue Liquid Crystal Nanocomposites and Their Photonics Applications)
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Abstract

We report photophysical properties of a nanocomposite consisting of perovskite quantum cuboids (QCs) formed by CsPbBr3 and a wide temperature range nematic liquid crystal. Contrary to observations made with conventional II-VI quantum dots dispersed in a liquid crystal, the used QCs form, under the influence of the nematic orientation, linear assemblies over macroscopic length scales evidenced by polarizing optical microscopy. Interestingly, the linear assembly is actually caused by such an anisotropic arrangement at the nm scale, as seen in TEM images. Thin films of the nanocomposite exhibiting this unique and fascinating character exhibit absorption and emission features, which are quite appealing. These include retention of the sharp bandwidth of emission characteristic of the native QCs and establishment of dual anisotropies, arising from the values being different along the director as well in the two directions orthogonal to it. We also present data on voltage-driven switching between one of the anisotropic limits. View Full-Text
Keywords: CsPbBr3 perovskite quantum cuboids; nanocomposites; dual anisotropy; switchable emission; nematic liquid crystals; linear assemblies CsPbBr3 perovskite quantum cuboids; nanocomposites; dual anisotropy; switchable emission; nematic liquid crystals; linear assemblies
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Satapathy, P.; Santra, P.K.; Prasad, S.K. Synergistic Path for Dual Anisotropic and Electrically Switchable Emission From a Nanocomposite of CsPbBr3 Quantum Cuboids and Nematic Liquid Crystal. Crystals 2019, 9, 378.

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