Amazing stuff! Want to look like a Christmas tree or like a billboard?
"... The researchers made their Fi-LEDs by coating thin aluminium fibres with an alumina-based material called a porous alumina membrane.
They then filled the pores in this material with a precursor to a metal-halide perovskite, a type of crystal material with unusual optical and electronic properties. ..."
"... Fiber light-emitting diodes (Fi-LEDs) stand out as a key component in the realm of flexible LEDs because of their compatibility with textile fabrication and excellent spatial luminance uniformity. Metal halide perovskites (MHPs) have emerged as promising light-emitting materials for next-generation LEDs due to their superior optoelectronic properties. ...
a novel approach using porous alumina membrane (PAM) templates on thin aluminum fibers. The PAM, with an ultrasmall pore size of approximately 5 nm, was fabricated on aluminum fibers using a roll-to-roll solution-coating process. The MHP precursor solution was filled into the PAM channels, followed by a surrounding annealing procedure to ensure spatially uniform solvent vaporization and MHP crystallization. This method enables the uniform growth of PeQW arrays and minimizes the formation of unwanted thin-film structures on the PAM surface. ..."
a novel approach using porous alumina membrane (PAM) templates on thin aluminum fibers. The PAM, with an ultrasmall pore size of approximately 5 nm, was fabricated on aluminum fibers using a roll-to-roll solution-coating process. The MHP precursor solution was filled into the PAM channels, followed by a surrounding annealing procedure to ensure spatially uniform solvent vaporization and MHP crystallization. This method enables the uniform growth of PeQW arrays and minimizes the formation of unwanted thin-film structures on the PAM surface. ..."
From the abstract:
"Fiber light-emitting diodes (Fi-LEDs), which can be used for wearable lighting and display devices, are one of the key components for fiber/textile electronics. However, there exist a number of impediments to overcome on device fabrication with fiber-like substrates, as well as on device encapsulations. Here, we uniformly grew all-inorganic perovskite quantum wire arrays by filling high-density alumina nanopores on the surface of Al fibers with a dip-coating process. With a two-step evaporation method to coat a surrounding transporting layer and semitransparent electrode, we successfully fabricated full-color Fi-LEDs with emission peaks at 625 nanometers (red), 512 nanometers (green), and 490 nanometers (sky-blue), respectively. Intriguingly, additional polydimethylsiloxane packaging helps instill the mechanical bendability, stretchability, and waterproof feature of Fi-LEDs. The plasticity of Al fiber also allows the one-dimensional architecture Fi-LED to be shaped and constructed for two-dimensional or even three-dimensional architectures, opening up a new vista for advanced lighting with unconventional formfactors."
HKUST Engineering Researchers Develop Full-Color Fiber LEDs Based on Perovskite Quantum Wires (original news release) "Paving the Way for Advanced Wearable Display Technologies"
Fig. 1. PeQWs Fabrication.
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