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Kuzmenko, Natalya K.
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article
Near-infrared two-photon excited photoluminescence from Yb3+-doped CsPbClxBr3−x perovskite nanocrystals embedded into amphiphilic silica microspheres
Abstract
Nonlinear absorption of metal-halide perovskite nanocrystals (NCs) makes them an ideal candidate for applications which require multiphoton-excited photoluminescence. By doping perovskite NCs with lanthanides, their emission can be extended into the near-infrared (NIR) spectral region. We demonstrate how the combination of Yb<sup>3+</sup> doping and bandgap engineering of cesium lead halide perovskite NCs performed by anion exchange (from Cl<sup>−</sup> to Br<sup>−</sup>) leads to efficient and tunable emitters that operate under two-photon excitation in the NIR spectral region. By optimizing the anion composition, Yb<sup>3+</sup>-doped CsPbCl<sub><i>x</i></sub>Br<sub>3−<i>x</i></sub> NCs exhibited high values of two-photon absorption cross-section reaching 2.3 × 10<sup>5</sup> GM, and displayed dual-band emission located both in the visible (407-493 nm) and NIR (985 nm). With a view of practical applications of bio-visualisation in the NIR spectral range, these NCs were embedded into silica microspheres which were further wrapped with amphiphilic polymer shells to ensure their water-compatibility. The resulting microspheres with embedded NCs could be easily dispersed in both toluene and water, while still exhibiting a dual-band emission in visible and NIR under both one- and two-photon excitation conditions. © The Royal Society of Chemistry 2024.<br/>.