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Europium-Doped Lead-Free Cs 3 Bi 2 Br 9 Perovskite Quantum Dots and Ultrasensitive Cu 2+ Detection
Abstract
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 Eu 3+ -doped lead-free Cs 3 Bi 2 Br 9 PeQDs employing a modified ligand-assisted reprecipitation method. The Cs 3 Bi 2 Br 9:Eu 3+ PeQDs demonstrate multicolor emissions including the exciton emission of the PeQDs and the 5 D 0 – 7 F J transition for Eu 3+ ion. Compared to the bare Cs 3 Bi 2 Br 9 PeQDs, the Eu 3+ -doped PeQDs display highly improved PLQY from 18% to ∼42.4% and excellent water stability. Finally, nontoxic and highly efficient Cs 3 Bi 2 Br 9:Eu 3+ PeQDs were employed as a highly sensitive fluorescent probe for Cu 2+ ion detection in water, which demonstrates a good linear range from 5 nM to 3 μM 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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“Based on their sensing mechanisms, perovskite optical sensors can be divided into ion exchange type, electron transfer type, and fluorescence resonance energy transfer (FRET) type (Figure 2) [13,[34][35][36][37][38][39][40][41][42].”
From Design Strategies and Emerging Applications of Perovskite-Based Sensors (2025) · cites this paper as [34]
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“This electron transfer affects the optical properties of the perovskite, such as absorption and emission spectra (Figure 2B) [34].”
From Design Strategies and Emerging Applications of Perovskite-Based Sensors (2025) · cites this paper as [34]
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Metadata
- Authors
- Ding, N., Zhou, D., Pan, G., Xu, W., Chen, X., Li, D., Zhang, X., Zhu, J., Ji, Y., & Song, H.
- Affiliations
- Jilin University (CN)
- Corresponding author
- Xu, Wen
- Song, Hongwei
- Venue
- ACS Sustainable Chemistry & Engineering
- Publisher
- American Chemical Society (ACS)
- Published
- 2019-04-10
- Volume
- 7
- Issue
- 9
- Pages
- 8397-8404
- ISSN
- 2168-0485 (ISSN-L)
- OpenAlex
- W2935745262
- Cited by
- 171
- References
- 56
- Citations by year
- 2026: 13 · 2025: 20 · 2024: 27 · 2023: 22 · 2022: 32 · 2021: 21 · 2020: 32 · 2019: 4
- FWCI
- 8.00
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- ACS Sustainable Chemistry & Engineering (publishedVersion)
- Funders
- National Natural Science Foundation of China (11374127, 11504131, 11674127, 61674067, 81201738, 11304118)
- Natural Science Foundation of Jilin Province (20170520111JH)
- Ministry of Science and Technology of the People's Republic of China (2014CB643506, 2016YFC0207101)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Perovskite Materials and Applications
- Physical Sciences › Materials Science › Materials Chemistry › Quantum Dots Synthesis And Properties
- Physical Sciences › Materials Science › Materials Chemistry › Carbon and Quantum Dots Applications
- Keywords
- Cs3Bi2Br9, europium doping, Eu3+ luminescence, Cu2+ detection, fluorescent probes, ligand-assisted reprecipitation, photoluminescence quantum yield, water stability, heavy metal ion detection, multicolor emission
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