Efficient Multi-Luminescence Covering the Visible to Near-Infrared Range in Antimony and Lanthanide Co-Doped Indium-Based Zero-Dimensional Perovskites Nanocrystals

摘要

Doping impurity ions, such as lanthanide (Ln~(3+)) ions, can introduce uniqueemissions over the visible and near infrared (NIR) region and enrich theoptoelectronic properties for lead-free perovskites. Here, tetragonalCs_2InCl_6:Sb nanocrystals (NCs) with bright self-trapped excitons (STEs)emission have been synthesized. Interestingly, tetragonal Cs_2InCl_6:1%Sb cantransform into monoclinic Cs_2InCl_6:1%Sb and orthorhombicCs_2InCl_5·H_2O:1%Sb under different solvent triggers. Further, a series of Ln~(3+)ions are doped into Cs_2InCl_6:Sb NCs, along with the appearance of Ln~(3+) ionsemissions over the visible and NIR region. Benefiting from the differentphotoluminescence (PL) origins of the STEs and Eu~(3+) emissions,Cs_2InCl_6:Sb,Eu NCs enable varied color delivery and exhibit great potential asanti-counterfeiting materials. Meantime, Cs_2InCl_6:Sb,Nd NCs with strong NIRemissions demonstrate great potential for NIR light-emitting diode (LED)applications. This work not only presents an effective strategy to tune theoptoelectronic properties of lead-free perovskites, but also provides insightinto applications in the anticounterfeiting and LED fields.