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.
Highlights
Investigations on composites comprising nanostructures and liquid crystals have become a hot topic owing to the possible complementary aspects in the properties of the two constituents.Liquid crystals (LCs), composed of calamitic, disc-like or banana-shaped molecules, are fluids at least in one dimension, and can exhibit various degrees of ordering that can be tuned by different external control parameters [1]
We have described photophysical properties in a nanocomposite comprising cesium lead halide perovskite quantum cuboids (QCs) dispersed in a wide temperature range nematic liquid crystal
Unlike the liquid crystal systems composed of conventional II-VI quantum dots, the QCs employed here exhibit linear assemblies clearly seen at the nm scale, through Transmission electron microscopy (TEM), and at the mm scale, through polarizing optical microscope
Summary
Liquid crystals (LCs), composed of calamitic, disc-like or banana-shaped molecules, are fluids at least in one dimension, and can exhibit various degrees of ordering that can be tuned by different external control parameters [1]. Owing to the inherent nature of the material, these devices are passive in that they manipulate light falling on them, but do not emit any light of their own This demands that but for the simple alphanumeric devices, a backlighting is required. While compact fluorescent tubes have been the standard backlighting sources, in recent times, light emitting diodes and quantum dots are taking over. It would be quite attractive if the liquid crystal were itself an emitter
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