摘要：SummaryNear-infrared (NIR) phosphor-converted light-emitting diode (pc-LED) has great potential in non-invasive detection, while the discovery of tunable broadband NIR phosphor still remains a challenge. Here, we report that Cr3+-activated LiIn2SbO6exhibits a broad emission band ranging from 780 to 1400 nm with a full width at half maximum (FWHM) of 225 nm upon 492 nm excitation. The emission peaks are tuned from 970 to 1020 nm together with considerable broadening of FWHM (∼285 nm) via Li/Na substitution. Depending on Yb3+co-doping, a stronger NIR fluorescence peak of Yb3+appears with improved thermal resistance, which is ascribed to efficient energy transfer from Cr3+to Yb3+. An NIR pc-LED package has been finally designed and demonstrated a remarkable ability to penetrate pork tissues (∼2 cm) so that the insertion depth of a needle can be observed, indicating that the phosphor can be applied in non-destructive monitoring.Graphical abstractDisplay OmittedHighlights•LiIn2SbO6:Cr3+exhibits near-infrared emission in the range 780-1400 nm•Li+/Na+substitution in LiIn2SbO6:Cr3+enables peak shift from 970 nm to 1020 nm•Efficient energy transfer process from Cr3+to Yb3+is reported•The application of LiIn2SbO6:Cr3+,Yb3+phosphor in non-invasive detection is demonstratedInorganic Chemistry; Optical Materials; Photonics
