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Lead halide perovskite nanocrystals (NCs) exhibit excellent tunable emissions covering the entire visible spectral region, but they do not emit near-infrared (NIR) light. We synthesized rare earth element doped CsPbCl 3 NCs for NIR emission. The Yb 3+ doped CsPbCl 3 NCs emitted strong 986 nm NIR light; the Yb 3+ /Er 3+ co-doped CsPbCl 3 NCs emitted at 1533 nm. The total photoluminescence quantum yield (PL QY) of the CsPbCl 3 NCs changed from 5.0% to 127.8% upon incorporating 2.0% Yb 3+ , a factor of 25.6 times enhancement. The material's stability was tested under continuous ultraviolet (365 nm) irradiation. The doped CsPbCl 3 NCs exhibited a better stability than the undoped one. The PL intensity of the undoped CsPbCl 3 NCs dropped to 20% of the initial value in 27 h, while the doped one took 85 h.

Yb3+ and Yb3+/Er3+ doping for near-infrared emission and improved stability of CsPbCl3 nanocrystals

Yb³⁺ and Yb³⁺/Er³⁺ doping for near-infrared emission and improved stability of CsPbCl₃ nanocrystals