Yb3+ and Yb3+/Er3+ Doping for Near-Infrared Emission and Improved Stability of CsPbCl3 Nanocrystals.
Xiangtong ZhangYu ZhangXiaoyu ZhangWenxu YinYu WangHua WangMin LuZhiyang LiZhiyong GuWilliam W YuPublished in: Journal of materials chemistry. C (2018)
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 CsPbCl3 NCs for NIR emission. The Yb3+ doped CsPbCl3 NCs emitted strong 986 nm NIR light; the Yb3+/Er3+ co-doped CsPbCl3 NCs emitted at 1533 nm. The total photoluminescence quantum yield (PL QY) of the CsPbCl3 NCs changed from 5.0% to 127.8% upon incorporating 2.0% Yb3+, a factor of 25.6 times enhancement. The material's stability was tested under continuous ultraviolet (365 nm) irradiation. The doped CsPbCl3 NCs exhibited a better stability than the undoped one. The PL intensity of the undoped CsPbCl3 NCs dropped to 20% of the initial value in 27 h, while the doped one took 85 h.
Keyphrases
- energy transfer
- quantum dots
- photodynamic therapy
- highly efficient
- metal organic framework
- fluorescence imaging
- drug release
- visible light
- light emitting
- endoplasmic reticulum
- breast cancer cells
- optical coherence tomography
- radiation therapy
- high intensity
- magnetic resonance
- molecular dynamics
- municipal solid waste