@article{Hu2026, 
author = {Ziyi Hu and Shuangyin Zhu and Shisheng Lin and Tao Pang and Lingwei Zeng and Feng Huang and Daqin Chen},
title = {Glass network engineering enables efficient nir cut-off in Cu2+ blue glasses},
year = {2026},
journal = {Journal of Advanced Ceramics},
keywords = {fluorophosphate glass, copper ions, optical basicity, glass filter, ligand field},
url = {https://www.sciopen.com/article/10.26599/JAC.2026.9221398},
doi = {10.26599/JAC.2026.9221398},
abstract = {Near-infrared (NIR) cut-off filters play a key role in imaging systems by blocking NIR interference on CMOS sensors, thereby preventing image ghosting and distortion. However, current commercial Cu2+-doped blue glasses struggle to balance high visible transmittance with complete NIR cut-off because of the uncontrolled formation of Cu+ and Cu2+ and the difficulty of regulating the Cu2+ ligand field. Herein, we propose a network-engineering strategy to modify the fluorophosphate glass network through alkali-metal (AM) doping. Large-size AM ions in the glass provide high optical basicity and an oxidizing atmosphere, resulting in a Cu2+/Cu+ ratio as high as 29.87. Meanwhile, they regulate the glass network structure to reduce the octahedral distortion of the CuO4F2 unit, leading to a redshift of the NIR cut-off wavelength. As a result, the as-prepared blue glass exhibits both high visible transmittance and efficient NIR cut-off, outperforming commercial counterparts. Images captured using the present blue glass show higher saturation and more realistic color reproduction without NIR-light interference. This work provides a new strategy for addressing key bottlenecks in commercial blue glasses and offers an alternative material for advanced imaging.}
}