SEM images for (a) and (b) phosphors.
XRD patterns for (a) and (b) phosphors. (c) Three-dimensional perspective view of the crystallite. The octahedra are graphically emphasized.
EPMA spectra for (a) and (b) phosphors.
PL spectra for (a) and (b) phosphors measured at 300 K.
PL and PLE spectra for phosphor at 300 K. The PLE spectrum was measured by monitoring at , while the PL spectrum was obtained by exciting at . The vertical bars in the PLE spectrum show the calculated results of Eq. (1) with and .
Tanabe–Sugano energy-level diagram for a system in the octahedral symmetry .
(a) Diffuse reflectance and (b) optical absorption spectra for phosphor at 300 K.
Temperature-dependent PL spectra for phosphor between 20 and 300 K.
PL spectra for (a) , (b) , and (c) phosphors at and 300 K. The spectra were taken from Refs. 7 and 8.
Positions of (a) ZPL and (b) local vibronic emission peaks vs temperature for phosphor.
(a) Stokes and anti-Stokes PL intensities in phosphor at . (b) Ratio of anti-Stokes/Stokes intensities vs temperature for phosphor. The solid lines in (a) and (b) represent the calculated results of Eqs. (2) and (4), respectively.
Integrated red emission intensity vs temperature for (a) and (b) phosphors. The solid lines represent the calculated results of Eq. (8).
Vibronic modes in and at 300 K (in ). The values are taken from Ref. 8.
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