Achieving an efficient near-infrared luminescence and wide-range spectral tunability in garnet NaCaHfGeO:Cr phosphor.

Near-infrared (NIR) phosphor-converted light-emitting diode (pc-LED) has emerged as the most promising NIR light source, highlighting the importance of exploring phosphors with excellent efficiency and sufficient spectral coverage. Herein, a garnet NaCaHfGeO:Cr phosphor with an internal quantum efficiency (IQE) of 79.2% has been developed, which exhibits a relatively long wavelength NIR emission peak at 830 nm and a full width at half maximum (FWHM) of 144 nm.

Understanding the broadband near-infrared luminescence in a highly distorted garnet CaHfGeO:Cr phosphor.

Broadband near-infrared (NIR) spectroscopy generated from a phosphor-converted light-emitting diode (pc-LED) has multifunctional applications, including food-quality analysis, bio-medical and night-vision, stimulating the demand for developing various NIR phosphors with desired properties. Herein, we selected a highly distorted garnet CaHfGeO as the host and explored the near-infrared luminescence of Cr. As expected, this material achieved a long-wavelength NIR emission and excellent absorption efficiency based on the effect of Jahn-Teller distortion.

An efficient and thermally stable near-infrared phosphor derived from the LnScInGaO:Cr (Ln = La, Gd, Y, and Lu) garnet family.

A broadband near-infrared (NIR) light source based on a phosphor-converted light-emitting diode (pc-LED) has attracted increasing interest to be used in non-destructive examination, security-monitoring and medical diagnosis fields, which stimulates the exploration of NIR phosphors with high performance. Herein, a series of Cr-activated garnet LnScInGaO:Cr (Ln = La, Gd, Y, and Lu) phosphors were reported, allowing an emission peak ranging from 726 to 822 nm. Among them, YScInGaO:Cr with an optimized Cr-doping concentration of 6 mol% exhibits a high internal quantum efficiency (IQE = 83.