4 years ago

Cesium Lead Halide Perovskite Quantum Dots as a Photoluminescence Probe for Metal Ions

Cesium Lead Halide Perovskite Quantum Dots as a Photoluminescence Probe for Metal Ions
Yu Wang, Yafei Li, Xiangxing Xu, Ying Liu, Jianchun Bao, Xinping Wang, Xun Wang, Zhihui Dai, Xuexi Sheng
Perovskite structured CsPbX3 (X = Cl, Br or I) quantum dots (QDs) have attracted great attention in the past few years for appealing application potentials in photovoltaic and optoelectronic devices. In this report, the CsPbX3 QDs are shown to perform as a new probe for metal ions with high sensitivity, high selectivity and instant response by the quenching or enhancing of the photoluminescence (PL). Through experimental and calculation efforts, the probing mechanisms are investigated. A wide probing window for Cu2+ and Yb3+ ions ranging from 2 × 10−9 to 2 × 10−6m is exhibited for CsPbBr3 QDs. In practice, the CsPbBr3 QDs are successfully applied for fast probing Cu2+ ions in edible oils and vehicle lubricating oils with the precision consistent to the values measured by inductively coupled plasma (ICP). Thus, it provides a promising powerful tool in detecting certain metal ions in biological and industrial organic solution systems. Perovskite CsPbX3 (X = Cl, Br, or I) quantum dots are shown to perform as a new probe for certain metal ions with high sensitivity, selectivity, wide probing window and instant response by quenching or enhancing of the photoluminescence. In practice, it is successfully applied for probing Cu2+ ions in various edible oils and lubricating oils.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adma.201700150

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