Valence state control of Cr⁴⁺-activated Li₂SrGeO₄for NIR-II light source to distinguish deuterium and non-deuterium reagents

Abstract

Cr-activated phosphor-converted light sources have attracted widespread attention in various applications based on Near-infrared (NIR) spectroscopy. Unfortunately, Cr ions usually face the issue of multivalence and typically exist in valence...

From Ancient Blue Pigment to Unconventional NIR Phosphor: A Thermal-Stable Near-Infrared I/II Broadband Emission from Ca1–xSrxCuSi4O10 Solid Solution

“…Meanwhile, the long lifetime of NIR emission could avoid the interference of background emission from biological matrices. − Other potential applications of these NIR emitters are NIR spectroscopy in night-vision imaging and nondestructive testing . Cr 3+ ion is the most widely used TM ion as the NIR emitting center, due to its high emission intensity and tunable wavelength from its 3 d 3 electron configurations. , However, it is toxic to the environment and living organisms, while it is easy to oxidate with a relatively low stability. As an alternative, Cu 2+ is an eco-friendly and chemically stable emitting center with high absorption efficiency, strong NIR luminescence, good chemical and photochemical stability.…”

Solvent-induced luminescence behavior of Ce/Eu@Gd-MOF for ratiometric detection of D2O in H2O

“…D 2 O is an important isotope of H 2 O, exhibiting a similar modular structure. 14–16 It possesses irreplaceable application value in chemical analysis, nuclear energy production, spectroscopic characterization and bioanalysis. 17–19 The similarity in the physical and chemical properties renders D 2 O and H 2 O highly suitable candidates for exploring solvent-induced luminescence behavior, minimizing the influence of factors such as solvent viscosity, chemical reactivity, and dispersibility.…”

Realizing Ultrabroadband NIR-II Emission and Wide-Range Wavelength Tuning in Cr4+-activated ABO2 (A = Li, Na; B = Al, Ga) Phosphors

“…23 The Li 2 SrGeO 4 : Cr 4+ phosphor can emit near-infrared light in the range of 1000−1600 nm with a peak of 1170 nm, which can be used to distinguish deuterium and nondeuterium reagents. 24 The Li 2 ZnGeO 4 : Cr 4+ phosphors synthesized by Liu et al exhibit a luminous wavelength range of 1000−1500 nm with a center at 1218 nm, which has certain application potentials in nondestructive testing and bioimaging. 21 Based on the published results of Cr 4+ -doped phosphors, we can find that the central emission wavelengths are usually concentrated within 1300 nm.…”

“…The Ca 2 GeO 4 : Cr 4+ near-infrared phosphor exhibits a wideband emission center located at 1290 nm and a wavelength in the range of 1100–1600 nm . The Li 2 SrGeO 4 : Cr 4+ phosphor can emit near-infrared light in the range of 1000–1600 nm with a peak of 1170 nm, which can be used to distinguish deuterium and nondeuterium reagents . The Li 2 ZnGeO 4 : Cr 4+ phosphors synthesized by Liu et al.…”