Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 9, Pages 8397-8404Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b00038
Keywords
Lead-free perovskite quantum dots; Multicolor emissions; Water stability; Cu2+ ion detection
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Funding
- Major State Basic Research Development Program of China (973 Program) [2014CB643506]
- National Key Research and Development Program [2016YFC0207101]
- National Natural Science Foundation of China [11504131, 61674067, 11304118, 11374127, 81201738, 11674127]
- Jilin Province Science Fund for Excellent Young Scholars [20170520111JH]
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Pollution triggered by highly toxic heavy metal ions has become of worldwide critical concern; thus, it is urgent to develop an eco-friendly and nontoxic fluorescence probe for metal ions sensing. The lead-free all-inorganic perovskite quantum dots (PeQDs) could be ideal candidates but are limited by their low photoluminescence quantum yield (PLQY). In this work, we successfully fabricated Eu3+-doped lead-free Cs3Bi2Br9 PeQDs employing a modified ligand-assisted reprecipitation method. The Cs3Bi2Br9:Eu3+ PeQDs demonstrate multicolor emissions including the exciton emission of the PeQDs and the D-5(0)-F-7(J) transition for Eu3+ ion. Compared to the bare Cs3Bi2Br9 PeQDs, the Eu3+ -doped PeQDs display highly improved PLQY from 18% to similar to 42.4% and excellent water stability. Finally, nontoxic and highly efficient Cs3Bi2Br9:Eu3+ PeQDs were employed as a highly sensitive fluorescent probe for Cu2+ ion detection in water, which demonstrates a good linear range from 5 nM to 3 pM with a correlation coefficient of 0.996 and a low detection limit of 10 nM. Our work not only provides a new strategy to improve the optical performance of lead-free PeQDs but also expands their applications for metal ions sensing.
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