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Multispectral upconversion nanoparticles for near infrared encoding of wearable devices
Gibum Lee1, Jonghwan Mun1, Hyunsik Choi1
1Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH) 77 Cheongam-ro, Nam-gu Pohang Gyeongbuk 37673 Korea skhanb@postech.ac.kr +82 54 279 2399 +82 54 279 2159.
RSC Advances
|April 28, 2022
Summary
Researchers developed new transparent films using upconversion nanoparticles (UCNPs) for near-infrared (NIR) encoding. These films offer a simple, fast, and robust method for individual recognition on wearable devices like contact lenses.
Area of Science:
- Materials Science
- Nanotechnology
- Biomedical Engineering
Background:
- Existing individual recognition technologies like iris scans and barcodes have limitations for non-face-to-face authorization.
- There is a persistent need for recognition methods that are easy to use, quick, and reliable.
Purpose of the Study:
- To develop novel multispectral transparent films utilizing upconversion nanoparticles (UCNPs) for near-infrared (NIR) encoding.
- To explore the application of these UCNP films in wearable devices for individual recognition.
Main Methods:
- Fabrication of multispectral transparent films composed of upconversion nanoparticles (UCNPs).
- Integration of UCNP films into wearable devices, specifically contact lenses and patch devices.
- Irradiation with 980 nm NIR light to induce luminescence and analysis of emitted colors using RGB value analysis and a charge-coupled digital (CCD) camera for decoding.
Main Results:
- UCNP films integrated into contact lenses displayed distinct luminescence colors under NIR irradiation, enabling pattern generation.
- Successful decoding of encoded UCNP films in contact lenses was achieved through RGB value analysis.
- UCNP barcode films demonstrated versatility by being attachable to diverse substrates, including skin and currency.
Conclusions:
- Multispectral UCNP transparent films represent a feasible platform for facile individual recognition.
- The developed technology offers a promising solution for non-face-to-face authorization in wearable applications.
- The adaptability of UCNP films to various surfaces broadens their potential applications in secure identification.
