Multi-wavelength excitable mid-infrared luminescence and energy transfer in core–shell nanoparticles for nanophotonics

Abstract

We report a novel strategy to realize the multiple excitation wavelength responsive 2 μm emission of Ho3+ (5I7 → 5I8 transition) in a single nanoparticle by employing an erbium sublattice as the sensitizing host.

Enhancing NIR‐II Upconversion Monochromatic Emission for Temperature Sensing

“…[36] In recent years, Er 3+ have been used as sensitizer, and introduced the excitation band of UCNPs into NIR-II (1532 nm) to realize high resolution emission, with the synergistic interaction of Er-Nd, Er-Ho, Er-Yb, etc. [37][38][39][40] However, there are few researches on the both pure/monochromatic UC emission and excitation in NIR-II regions, which was important implications for biological imaging and sensing. [40][41][42] In this work, a series of Yb 3+ doped NaErF 4 :x%Yb UCNPs were synthesized which exhibited NIR-II monochromatic luminescence at 978 nm upon low power 1532 nm excitation.…”

“…[ 36 ] In recent years, Er 3+ have been used as sensitizer, and introduced the excitation band of UCNPs into NIR‐II (1532 nm) to realize high resolution emission, with the synergistic interaction of Er‐Nd, Er‐Ho, Er‐Yb, etc . [ 37–40 ] However, there are few researches on the both pure/monochromatic UC emission and excitation in NIR‐II regions, which was important implications for biological imaging and sensing. [ 40–42 ]…”