From the implementation point of view, the printable magnetic Janus colloidal photonic crystals (CPCs) microspheres are highly desirable. Herein, we developed a dispensing-printing strategy for magnetic Janus CPCs display via a microfluidics-automatic printing system. Monodisperse core/shell colloidal particles and magnetic Fe 3 O 4 nanoparticles precursor serve as inks. Based on the equilibrium of three-phase interfacial tensions, Janus structure is successfully formed, followed by UV irradiation and self-assembly of colloid particle to generate magnetic Janus CPCs microspheres. Notably, this method shows distinct superiority with highly uniform Janus CPCs structure, where the TMPTA/Fe 3 O 4 hemisphere is in the bottom side while CPCs hemisphere is in the top side. Thus, by using Janus CPCs microspheres with two different structural colors as pixel points, a pattern with red flower and green leaf is achieved. Moreover, 1D linear Janus CPCs pattern encapsulated by hydrogel is also fabricated. Both the color and the shape can be changed under the traction of magnets, showing great potentials in flexible smart displays. We believe this work not only offers a new feasible pathway to construct magnetic Janus CPCs patterns by a dispensing-printable fashion, but also provides new opportunities for flexible and smart displays. Graphical
Perovskite single crystals have emerged as attractive structures for integrated devices. However, due to uncontrolled crystallization, the versatile and scalable fabrication of arrays of perovskite single crystals with controllable morphology and location remains a great challenge. Here, we report a facile printing strategy to controllably fabricate perovskite single-crystal arrays with well-defined morphology and location. Through modulating perovskite precursor ion aggregation in microdroplets by controlling the temperature of substrates, perovskite single-crystal arrays with controlled morphologies are fabricated, which can be selectively integrated on silicon for high-performance-type tailored laser arrays. More importantly, integrated perovskite single-crystal microstructures are printed, showing an efficiently coupling property with well-maintained intrinsic characters of the original signals. This strategy enables fully inkjet-printed morphology-controllable perovskite single-crystal arrays and functional coupling-structure arrays, which offers new opportunities for integrated photonic and optoelectronic devices.
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