4.7 Article

Exploring smartphone-based environmental sensors through applying perovskite quantum dots

Journal

CHEMICAL ENGINEERING JOURNAL
Volume 448, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.137583

Keywords

Sensor; Perovskite quantum dots; Smartphone; UV radiation; COD

Funding

  1. National Natural Science Foundation of China [31972148, 32101609, 32171627]
  2. Distinguished Young Scientists Program of Beijing Natural Science Foundation [JQ19023]
  3. Distinguished Scientist Development Program of Beijing Academy of Agriculture and Forestry Sciences [JKZX201904, JKZX202209]

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This article introduces the extension of the detection range of smartphone cameras to the ultraviolet region using perovskite quantum dots, and the realization of a solar UV radiation sensor and a water chemical oxygen demand sensor. These sensors can measure water quality and solar UV index using smartphones anytime and anywhere.
Smartphone have been applied to develop various sensors. However, because of the limitations of the Si detectors used in smartphone cameras, they can only detect visible light, which greatly restricts their functions for advanced sensor development. Herein, we extended the detection range of smartphone cameras to ultraviolet (UV) region by using perovskite quantum dots (QDs), which have excellent down-converting properties. We realized two smartphone-based environmental sensors. (1) A solar UV radiation sensor in which the perovskite QDs convert UV light to visible light that is detected by the smartphone camera. Coupled with app, this ingenious sensor can detect the solar UV index and also visualize the UV-radiation distribution. (2) A water chemical oxygen demand sensor that based on UV absorption. The sensor was realized by adding a simple attachment to the front of the smartphone camera. It can be used as an in-pocket sensor to measure water quality anytime and anywhere.

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