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- W3188388142 abstract "Abstract Porous silicon (PSi) is a promising material for future integrated nanophotonics when coupled with guest emitters, still facing challenges in terms of homogenous distribution and nanometric thickness of the emitter coating within the silicon nanostructure. Herein, it is shown that the nanopore surface of a porous silicon oxide (PSiO 2 ) microcavity (MC) can be conformally coated with a uniform nm‐thick layer of a cationic light‐emitting polyelectrolyte, e.g., poly(allylamine hydrochloride) labeled with Rhodamine B (PAH‐RhoB), leveraging the self‐tuned electrostatic interaction of the positively‐charged PAH‐RhoB polymer and negatively‐charged PSiO 2 surface. It is found that the emission of PAH‐RhoB in the PSiO 2 MC is enhanced ( ≈ 2.5 × ) and narrowed ( ≈ 30 × ) at the resonant wavelength, compared with that of PAH‐RhoB in a non‐resonant PSiO 2 reference structure. The time‐resolved photoluminescence analysis highlights a shortening ( ≈ 20%) of the PAH‐RhoB emission lifetime in the PSiO 2 MC at the resonance versus off‐resonance wavelengths, and with respect to the reference structure, thereby proving a significant variation of the radiative decay rate. Remarkably, an experimental Purcell factor F p = 2.82 is achieved. This is further confirmed by the enhancement of the photoluminescence quantum yield of the PAH‐RhoB in the PSiO 2 MC with respect to the reference structure. Application of the electrostatic nanoassembling approach to other emitting dyes, nanomaterials, and nanophotonic systems is envisaged." @default.
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- W3188388142 date "2021-08-02" @default.
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- W3188388142 title "Nanoscale Photoluminescence Manipulation in Monolithic Porous Silicon Oxide Microcavity Coated with Rhodamine‐Labeled Polyelectrolyte via Electrostatic Nanoassembling" @default.
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- W3188388142 doi "https://doi.org/10.1002/adom.202100036" @default.
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