Ultra-broadband near-infrared phosphor Li3Sc2(PO4)3:Cr3+ realized by two-sites occupation

Broadband short-wave infrared Mg4Nb2O9:Cr3+,Li+ phosphor for nondestructive safety detection and biomedical imaging

“…Note that the thermal stability of the Mg 4 Nb 2 O 9 :3%Cr 3+ ,Li + sample is inferior to that of the Mg 4 Ta 2 O 9 :3%Cr 3+ ,Li + starlet, as reported by Tang et al (58.4%@373 K) and Wang et al (55%@373 K), 36,37 but comparable to many previously claimed results of tantalate, 48–50 niobate, 51 as well as systems with PL peak more than 850 nm, 52–55 such as ZnTa 2 O 6 :4%Cr 3+ (peak ∼935 nm, about 49%@373 K), ScTaO 4 :Cr 3+ (peak ∼940 nm, about 16%@373 K), InTaO 4 :4%Cr 3+ (peak ∼880 nm, about 23%@360 K), GaTa 0.5 Nb 0.5 O 4 :2.5%Cr 3+ (peak ∼865 nm, 55.2%@450 K), LiScP 2 O 7 :Cr 3+ (peak ∼880 nm, 41% at 373 K), Li 3 Sc 2 (PO 4 ) 3 :Cr 3+ (peak ∼978 nm, 37%@373 K), LiIn 2 SbO 6 :Cr 3+ (peak ∼970 nm, 10%@368 K), and Cs 2 AgInCl 6 :Cr 3+ (peak ∼1010 nm, < 10%@373 K). All comparable parameters and results are summarized in Table S5 (ESI†).…”

Strategy of Charge Compensation for High-Performance Ni2+-Activated MgAl2O4 Spinel Near-Infrared Phosphor Synthesis via the Sol–Gel Combustion Method

“…To circumvent the issue of serious heat accumulation under high-power density, alaser diode (LD), which has advantages in compactness, brightness, and efficiency over LED chips, is gradually replacing LED as the alternative excitation light source. − We tested the feasibility of excitation using a high-power laser. The luminescence properties of Zr 4+ /Ni 2+ codoped MgAl 2 O 4 phosphors were excited with a monochromatic continuous wavelength (CW) laser with λ ex = 360 nm.…”

Highly‐Sensitive, Tri‐Modal Luminescent Manometer Utilizing Band‐Shift, Ratiometric and Lifetime‐Based Sensing Parameters

“…The 𝛼-phase Li 3 Sc 2 (PO 4 ) 3 structure consists of three types of differently coordinated inequivalent Li + ions, three inequivalent P 5+ ions forming (PO 4 ) 3− tetrahedra, and two types of (ScO 6 ) 9− distorted octahedrons, differentiated by bond lengths between Sc 3+ and O 2− ions, as shown in Figure 1a. [21,24,25] The crystallographic positions of Sc 3+ ions are the most significant from the perspective of the incorporation of Cr 3+ ions into the Li 3 Sc 2 (PO 4 ) 3 structure. Considering Cr 3+ ions' preference to occupy six-fold-coordinated crystallographic positions, matching ionic charge and similar ionic radii -r (the difference of 17.45% -r Cr 3+ = 0.615 Å and r Sc 3+ = 0.745 Å) [26] ), it becomes evident that the (ScO 6 ) 9− octahedrons are the preferable positions for the Cr 3+ ion incorporation, as visually illustrated in Figure 1b.…”

“…[10,14,17] The Li 3 Sc 2 (PO 4 ) 3 :Cr 3+ is an example of a phosphor, showcasing a broad emission band asso-ciated with the 4 T 2 → 4 A 2 . [21] In order to identify the most suitable sample for subsequent studies of spectroscopic properties under applied pressure, thereby determining the manometric characteristic of the Li 3 Sc 2 (PO 4 ) 3 :Cr 3+ , excitation and emission spectra were measured for the samples with varying concentrations of Cr 3+ ions (0.1-5%). The spectra were measured at 183 K, as the emission intensity of Li 3 Sc 2 (PO 4 ) 3 doped with the lowest concentration of Cr 3+ ions (0.1%) was relatively weak at room temperature.…”

“…The selection of the Li 3 Sc 2 (PO 4 ) 3 host lattice was intentional, aimed at ensuring a weak crystal field for the incorporated Cr 3+ ions, which leads to a broad emission band associated with the 4 T 2 → 4 A 2 transition of Cr 3+ ions. [ 21 ] It should be highlighted that the demonstrated pressure sensor exhibits the highest sensitivity (dλ/dp = 23.9 nm/GPa) in the spectral shift and (S R = 93.56%/GPa) in the lifetime‐based modes reported so far.…”