Abstract
Near-infrared spectroscopy (NIRS) is a rapid, non-destructive analytical characterization tool. In this study, we report near-infrared (NIR) phosphor Ca3MgTiGe3O12:Cr3+ in garnet system, achieving ultra-broadband NIR emission. The emission spectrum of the phosphor ranges from 690 nm–1100 nm with a full width of half maximum (FWHM) value of ∼127 nm. The emission peak is observed at 786 nm when the excitation wavelength is 463 nm. The broadband emission seen in this study was identified as a result of 4T2 → 4A2 transition of Cr3+ in host lattice. The internal quantum efficiency (IQE) of the material was found to be as high as 66.5 %. The energy transfer mechanism, quantum yield, thermal stability and preparation conditions of the material were further investigated. These studies show that these materials with highly-efficient ultra-brosd near-infrared emissions are promising candidates for high-quality near-infrared light sources.
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