NIR-II-to-NIR-II upconversion and covert optical encryption in lanthanide halide double perovskites
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NIR‑II‑to‑NIR‑II upconversion under 1550 nm telecommunication-wavelength excitation is promising for advanced photonics, but high concentrations of Er3+ sensitizers inevitably cause severe quenching. Here, we report a lanthanide halide double perovskite en... ...
