Controlling Cr3+/Cr4+ concentration in single-phase host toward tailored super-broad near-infrared luminescence for multifunctional applications

Rapid Nondestructive Detection Enabled by an Ultra‐Broadband NIR pc‐LED

“…[11,[19][20][21] Broadened NIR emissions can be alternatively realized by doping chromium ions in different crystallographic sites of a multi-cationic host, such as La 2 MgZrO 6 ([MgO 6 ]/[ZrO 6 ]), La 3 Ga 5 GeO 14 ( ). [22][23][24][25] These crystals provide varying crystal fields around the Cr 3+ dopants, thereby expanding the bandwidths of the NIR emission due to inhomogeneous broadening. Co-doping Cr 3+ with luminescent ion Yb 3+ is another approach for extended control over the NIR emission profile.…”

A novel near-infrared phosphor Mg2InSbO6:Cr3+ with high quantum efficiency and considerable persistent luminescence duration

“…When Cr 3+ ions are incorporated into Mg 2 InSbO 6 , all the cation sites ( CN = 6, R Mg = 0.72 Å, R In = 0.80 Å, R Sb = 0.60 Å) in the Mg 2 InSbO 6 can accommodate Cr 3+ ions ( CN = 6, R Cr = 0.62 Å). 16 The following equation is useful for evaluating the possibility of replacement:where D r means the differences between the doped ions and replaced cations, R r and R d stand for the radii of the replaced cations in the host and the doped Cr 3+ ions, respectively. On condition that the D r is less than 30%, the substitution can take place.…”

“…When Cr 3+ ions are incorporated into Mg 2 InSbO 6 , all the cation sites (CN = 6, R Mg = 0.72 Å, R In = 0.80 Å, R Sb = 0.60 Å) in the Mg 2 InSbO 6 can accommodate Cr 3+ ions (CN = 6, R Cr = 0.62 Å). 16 The following equation is useful for evaluating the possibility of replacement:…”

Structural Confinement toward Controlling Energy Transfer Path for Enhancing Near-Infrared Luminescence

“…As reported in La 3 Ga 5 GeO 14 and Mg 3 Ga 2 GeO 8 compounds, , superbroadband luminescence can be obtained due to the occupation of Cr 3+ ions in different coordination environments. Recently, our group reported the ultrabroadband emission with the wavelength of 650–1600 nm through fully controlling the concentration ratio of Cr 3+ to Cr 4+ in a single Mg 2 GeO 4 host with multiple sites . Besides, ET between different luminescence centers such as Cr 3+ and Yb 3+ ions has been widely employed in LiScP 2 O 7 , Gd 3 Sc 1.5 Al 0.5 Ga 3 O 12 , Ca 2 LuZr 2 Al 3 O 12 , and Ca 2 YHf 2 Al 3 O 12 hosts to enhance luminescence efficiency and thermal stability. ,− It is worth noting that ET is closely related to the distance between optically active ions.…”

“…Recently, our group reported the ultrabroadband emission with the wavelength of 650−1600 nm through fully controlling the concentration ratio of Cr 3+ to Cr 4+ in a single Mg 2 GeO 4 host with multiple sites. 25 Besides, ET between different luminescence centers such as Cr 3+ doped materials. 30,31 In the structure of Sr 9 Cr(PO 4 ) 7 (SCP), the structural confinement effect can control the distance between luminescence centers, thereby inhibiting the ET between specific luminescence quenching centers and inducing the ET from luminescence quenching center to the other more thermally stable efficient center.…”