Highly stable perovskite nanogels as inks for multicolor luminescent authentication applications†
Preparation of multiplexing optical tags with well-resolved emissions is particularly intriguing in anti-counterfeiting and authentication applications given that broad and overlapping emission would severely impair the encoding capacities and performance. Bright and sharp multicolor emission of metal halide perovskite quantum dots (PQDs) makes them good alternatives, but the weak stability potentially hampers their practical implications. We here developed a novel strategy for synthesizing a full-spectral emissive perovskite gel with greatly improved photo-stability, thermal-stability and humidity-stability by embedding PQDs in a pre-polymerized polymer gel at room temperature and further employed it as multicolor ink for printing anti-counterfeiting two-dimensional barcodes.
- This article is part of the themed collections: International Year of the Periodic Table : From Pb and Sn Perovskites to the Next Generation and 2018 Journal of Materials Chemistry C HOT Papers