Figure 1 | Probing UCL emission driven by topology-based ETNs in core–shell UCNPs. (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure 1 | Probing UCL emission driven by topology-based ETNs in core–shell UCNPs.

Caption

Figure 1 | Probing UCL emission driven by topology-based ETNs in core–shell UCNPs. (A) Schematic showing 450‑nm UCL from Yb,Tm@Y, Yb@Tm@Y, and Tm@Yb@Y UCNPs under 980 nm laser light alone (left) and combined 980 nm and 808 nm laser light (right). (B) Illustration of how Yb3+ sensitizers and Tm3+ emitters are arranged in Tm@Yb@Y UCNPs to form energy transfer networks that guide energy toward the core–shell interface, boosting UCL for U-STED imaging. The intensity profile along the dashed line of a single nanoparticle is shown. Excitation/depletion intensities: 0.03 MW cm-2 (980 nm) and 1 MW cm-2 (808 nm). Pixel dwell time: 10 ms. Scale bar: 500 nm

Credit

Min Gu et al.

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