Albumin assisted sol-gel synthesized SrSnO3: Pr3+ red persistent phosphors for temperature sensing

Facile assembly of flexible quaternary SnO2/SrSnO3/Fe3O4/PVDF nanocomposites with tunable optical, electrical, and magnetic properties for promising magneto-optoelectronic applications

“…2 , the prepared TSF NCs' structural, morphology, and composition were analyzed using the XRD spectrum, TEM, FESEM, and EDX graphs. Figure 2 a illustrates the XRD pattern of TSF NCs, which all had prominent lines at two theta of 26.68°, 33.94°, 51.91°, and 62.94°, which match up to the standard card (JCPDS: 41–1445) of tetragonal nanostructured tin oxide 24 ,and a spectra lines at two theta 22.04°, 31.34°, 39.23°, 40.89°, 42.5°, 44.96°, 47.0°, 50.45°, 51.87°, 55.84°, 57.31°,and 65.43° concerning the cubic phase of strontium stannate that matches up to JCPDS (22-1442), which typically refers to the results of recently reported works 25 ,Also a spectra lines at two theta 30.28°, 35.68°, 43.32, 47.16°, 57.31°, and 62.94° could be understood in the context of Fe 3 O 4 , cubic configuration (JCPDS No. 89-0691) 26 providing a combination of these three phases.…”

Layer-structure-suppressed concentration quenching of Dy3+ luminescence and the realization of a single phase white light-emitting phosphor cooperated with Tm3+

“…The optical band gap of phosphors can be calculated using the Kubelka–Munk equation. 27,28 where R ∞ is the ratio of the light scattered from the sample and BaSO 4 , A is the pre-factor constant independent of photon energy for this transition, S is the scattering coefficient, K is the absorption coefficient, F ( R ∞ ) is the Kubelka–Munk function, hv is the photon energy and E g is the bandgap energy. The relationship between hv and [ F ( R ∞ ) hv ] 2 reflects the corresponding band gap value, which is the intersection of the linear part extrapolated on the hv coordinate shown in Fig.…”

“…, and a narrow absorption peak from 300 to 600 nm, in which several peaks located at 388 nm, 427 nm, 454 nm and 473 nm, correspond to the 4f-4f electronic transitions of Dy The optical band gap of phosphors can be calculated using the Kubelka-Munk equation. 27,28…”

Theoretical calculations and photoluminescence properties of Sr4Al14O25:Mn4+ red phosphors doped with Li+

“…However, Pr 3+ -doped phosphors usually exhibit excitation with a narrow-band and weak intensity, and their quantum efficiency is low. 9 Recently, Mn 2+ /Mn 4+ -activated phosphors have become a research hotspot due to their low cost, ease of synthesis and lack of gas protection, as a red-light supplement in white light LED lighting. [10][11][12][13] As a transition metal ion, Mn 4+ exhibits an incomplete 3d 3 electron shell, and its outer layer is not shielded by the closed shell layer.…”

“…However, Pr 3+ -doped phosphors usually exhibit excitation with a narrow-band and weak intensity, and their quantum efficiency is low. 9…”