@article{Yang2025, 
author = {Yanling Yang and Fengyue Wang and Shan Zhang and Hongxin Zhang and Zhen Yang},
title = {NIR-IIb-emitted Er-coordination Polymer for Logic Gates and Optical Anticounterfeiting},
year = {2025},
journal = {Nano Biomedicine and Engineering},
volume = {17},
number = {1},
pages = {143-150},
keywords = {NIR-IIb emission, PEG–PAA–Er, Yb, D2O, optical anticounterfeiting},
url = {https://www.sciopen.com/article/10.26599/NBE.2024.9290107},
doi = {10.26599/NBE.2024.9290107},
abstract = {The second near-infrared window in a 1 500–1 700 nm region (known as the NIR-IIb region) presents low autofluorescence and a deep penetration depth, enabling a potential technology for effective imaging and anticounterfeiting applications. However, existing NIR-IIb-emitted fluorescence materials remain limited and possess low luminescent properties. In implementing the enhanced ~1 525 nm emission of the Er (III) complex in a nonorganic solvent, an amphiphilic diblock copolymer (PEG112–PAA12) was initially synthesized to coordinate with Er (III), and then certain Yb (III) was doped to form the PEG–PAA–Er/Yb complex. The complex shows a dramatic fluorescent enhancement of ~250-fold at ~1 525 nm in D2O than that in H2O under 980-nm laser irradiation, which is ascribed to the following factors: (1) The substitution of H2O by D2O can suppress the quenching effect of H2O at ~1 470 nm to achieve the emission of PEG–PAA–Er; (2) the doping of Yb (III) enables the co-luminescence effect to PEG–PAA–Er to improve NIR-IIb emission. Notably, the PEG–PAA–Er/Yb complex can construct molecular logic gates with logic functions and optical anticounterfeiting by using the abovementioned fluorescence changes.}
}