Mesostructured Composite Materials with Electrically Tunable Upconverting Properties

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Haridas Mundoor, Ivan I Smalyukh

Abstract

A promising approach of designing mesostructured materials with novel physical behavior is to combine unique optical and electronic properties of solid nanoparticles with long-range ordering and facile response of soft matter to weak external stimuli. Here, orientationally ordered nematic liquid crystalline dispersions of rod-like upconversion nanoparticles are designed, practically realized, and characterized. Boundary conditions on particle surfaces, defined through surface functionalization, promote spontaneous unidirectional self-alignment of the dispersed rod-like nanoparticles, mechanically coupled to the molecular ordering direction of the thermotropic nematic liquid crystal host. As host is electrically switched at low voltages ≈ 1 V, nanorods rotate, yielding tunable upconversion and polarized luminescence properties of the composite. Spectral and polarization dependencies are characterized and explained through invoking models of electrical switching of liquid crystals and upconversion dependence on crystalline matrices of nanorods, and their potential practical uses are discussed.

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Citations

Jun 15, 2018·Chemical Society Reviews·Yu WangXiaogang Liu
Feb 19, 2019·Advanced Materials·Zhiwei Li, Yadong Yin
Jul 30, 2020·Reports on Progress in Physics·Ivan I Smalyukh
Nov 29, 2017·Nature Materials·Ye YuanIvan I Smalyukh
Feb 12, 2021·Nature·Haridas MundoorIvan I Smalyukh
Oct 6, 2021·Nanoscale·Zijun WangThierry Gacoin
Nov 13, 2021·The Journal of Physical Chemistry Letters·Ze-Yu LyuChun-Hua Yan

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