Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.160
Publication date: 7th February 2022
A common strategy for downshifting luminescence is based on a trivalent lanthanide (Ln3+) ion as emission center and a sensitizer as light absorption center. Lead halide perovskites can be used as sensitizer to meet the demands for downshifting applications. However, perovskite sensitizers suffer from low visible absorption, poor stability, and toxicity. In this study, we demonstrate a downshifting configuration based on lead-free cesium manganese bromide nanocrystals enabling efficient transfer of high energy absorbed photons to the low energy emission centers in the near-infrared spectral region. For that, we obtained phase-pure CsMnBr3 and Cs3MnBr5 nanocrystals via a controlled synthesis and successfully doped them with Er3+, Yb3+, Tm3+ and Nd3+. The correlation of the CsMnBr3 broadband visible absorption to the lanthanides emission was confirmed with steady-state excitation spectra and time-resolved photoluminescence measurements. This work provides a lead-free material as an efficient sensitizer, which can help to develop and design visible to NIR downshifters.
We acknowledge support from the European research council project NANOLED (ERC-StG 851794).
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