Perovskite nanowire-block copolymer composites with digitally programmable polarization anisotropy.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 31172026.
- Also identified by DOI 10.1126/sciadv.aav8141 and PMC identifier 6544451.
- Licence recorded as CC BY-NC.
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Abstract
One-dimensional (1D) nanomaterials with highly anisotropic optoelectronic properties are key components in energy harvesting, flexible electronics, and biomedical imaging devices. 3D patterning methods that precisely assemble nanowires with locally controlled composition and orientation would enable new optoelectronic device designs. As an exemplar, we have created and 3D-printed nanocomposite inks composed of brightly emitting colloidal cesium lead halide perovskite (CsPbX<sub>3</sub>, X = Cl, Br, and I) nanowires suspended in a polystyrene-polyisoprene-polystyrene block copolymer matrix. The nanowire alignment is defined by the programmed print path, resulting in optical nanocomposites that exhibit highly polarized absorption and emission properties. Several devices have been produced to highlight the versatility of this method, including optical storage, encryption, sensing, and full-color displays.