Coherent light signals generated at the nanoscale are crucial to the realization of photonic integrated circuits. Self‐assembled nanowires from organic dyes can provide both a gain medium and an ...effective resonant cavity, which have been utilized for fulfilling miniaturized lasers. Excited‐state intramolecular proton transfer (ESIPT), a classical molecular photoisomerization process, can be used to build a typical four‐level system, which is more favorable for population inversion. Low‐power driven lasing in proton‐transfer molecular nanowires with an optimized ESIPT energy‐level process has been achieved. With high gain and low loss from the ESIPT, the wires can be applied as effective FP‐type resonators, which generated single‐mode lasing with a very low threshold. The lasing wavelength can be reversibly switched based on a conformation conversion of the excited keto form in the ESIPT process.
Low‐threshold single‐mode lasing was achieved via excited‐state intramolecular proton transfer (ESIPT)‐assisted population inversion in crystal organic nanowires fabricated by the self‐assembly of proton‐transfer dye molecules. The lasing wavelength can be reversibly switched based on the photoinduced conformation conversion of the excited keto form in the ESIPT process.
Advances in Flexible Metallic Transparent Electrodes Nguyen, Viet Huong; Papanastasiou, Dorina T.; Resende, Joao ...
Small (Weinheim an der Bergstrasse, Germany),
05/2022, Volume:
18, Issue:
19
Journal Article, Web Resource
Peer reviewed
Open access
Transparent electrodes (TEs) are pivotal components in many modern devices such as solar cells, light‐emitting diodes, touch screens, wearable electronic devices, smart windows, and transparent ...heaters. Recently, the high demand for flexibility and low cost in TEs requires a new class of transparent conductive materials (TCMs), serving as substitutes for the conventional indium tin oxide (ITO). So far, ITO has been the most used TCM despite its brittleness and high cost. Among the different emerging alternative materials to ITO, metallic nanomaterials have received much interest due to their remarkable optical‐electrical properties, low cost, ease of manufacturing, flexibility, and widespread applicability. These involve metal grids, thin oxide/metal/oxide multilayers, metal nanowire percolating networks, or nanocomposites based on metallic nanostructures. In this review, a comparison between TCMs based on metallic nanomaterials and other TCM technologies is discussed. Next, the different types of metal‐based TCMs developed so far and the fabrication technologies used are presented. Then, the challenges that these TCMs face toward integration in functional devices are discussed. Finally, the various fields in which metal‐based TCMs have been successfully applied, as well as emerging and potential applications, are summarized.
Recent progress and remaining challenges on metallic nanostructure‐based transparent electrodes (TEs), including oxide/metal/oxide multilayers, metal grids, metal nanowire/nanofiber/nanotrough percolating networks, metal meshes based on cracked templated, dealloyed ultrathin metallic films and some important nanocomposites, are reviewed and discussed. The various fields in which metal‐based TEs have been successfully applied as well as emerging and potential applications are summarized.
A new photothermal coupling agent for photothermal ablation (PTA) therapy of tumors is developed based on ultrathin PEGylated W18O49 nanowires. After being injected with the nanowire solution, the in ...vivo tumors exhibit a rapid temperature rise to 50.0 ± 0.5 °C upon irradiation with NIR laser light at a safe, low intensity (0.72 W cm−2) for 2 min (left‐hand mouse in the figure),), resulting in the efficient PTA of cancer cells in vivo in 10 min.
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