Photosensitizers with aggregation-induced far-red/near-infrared emission for versatile visualization and broad-spectrum photodynamic killing of pathogenic microbes

Luo, Juan; Yang, Ping; Cheng, Jingxi; Fan, Jiaqi; Zhou, Weiying; Lu, Yaru; Xie, Xiaobao; Wu, Wenbo; Zhang, Xinguo

doi:10.1016/j.jcis.2022.12.062

Cited by 6 publications

(1 citation statement)

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“…Near-infrared (NIR) emitting materials have gained enormous interest and exhibited potential applications in multiple fields like bio-imaging, food quality control, security camera, plant growth, and photovoltaics. , Various 3 d transition metals, such as Cr 3+ , Mn 2+ , Mn 5+ , Fe 3+ , Ni 2+ , and Cu 2+ , are commonly used as a luminescent center in inorganic NIR phosphors. − In this series, Cr and Ni have been extensively studied because of their promising luminescence properties. Cr 3+ is widely investigated as an efficient luminescent center, which exhibits a broadband NIR-I (700–950 nm) emission when it is substituted into the octahedral site with low crystal-field strength. − However, the NIR spectral region above 1000 nm could be only covered by the emission tail of Cr 3+ -activated phosphors with very low emission intensity.…”

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confidence: 99%

Sharp-Line Near-Infrared Emission from Tetrahedron-Occupied Ni²⁺ in Ca₂GeO₄

et al. 2023

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As far as we are concerned, the phenomenon of Ni 2+ luminescence in tetrahedral coordination has not been reported. For the first time, a new NIR phosphor Ca 2 GeO 4 :Ni 2+ is developed in this work. It is found that the NIR emission from this phosphor is a sharp peak attributed to the unusual Ni 2+ -occupied GeO 4 site in the lattice, instead of the conventional broadband luminescence of Ni 2+ in the octahedrally coordinated site. Crystal-field analysis has been applied, and the parameters Dq, B, and Δ are calculated to reveal the relationship between the emission profile and the crystal field strength. The optimal Ni 2+ doping concentration is found to be 1%. Ca 2 GeO 4 :Ni 2+ provides an efficient sharp-line (fwhm = 16 nm) emission centered at 1164 nm which originates from the 1 T 2 → 3 T 1 transition with an internal quantum efficiency of 23.1% and a decay lifetime of about 300 μs. This work could provide some new insights to explore novel NIR luminescent materials based on transition-metal elements.

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