SEM image for chemically synthesized phosphor in aqueous solution.
(a) XRD pattern for chemically synthesized phosphor. (b) XRD pattern from an ASTM card of (space ).
XPS survey spectrum for chemically synthesized phosphor.
PL spectra for (a) , (b) , (c) , and (d) phosphors measured at 300 K with a He–Cd laser as an excitation light source. The ZPL energies correspond to (a) 1.990, (b) 1.993, (c) 2.005, and (d) 2.017 eV, respectively. The , , and spectra shown in (b)–(d) were taken from Refs. 9 and 11.
PL and PLE spectra for phosphor at 300 K. The PL spectrum was obtained by exciting at , while the PLE spectrum was measured by monitoring at . The vertical bars in the PLE spectrum show the results calculated using Eq. (1) with and 11 .
Temperature-dependent PL spectra for phosphor measured between and 300 K in steps of 10 K with a He–Cd laser as an excitation light source.
PL spectra for phosphor measured at with a He–Cd laser as an excitation light source. The ZPL energy corresponds to 1.990 eV. Several local vibronic modes (, , and ), together with the fundamental lattice modes (TA and LA), are marked by vertical arrows.
PL spectra in the (a) and (b) regions for phosphor at and 300 K. The and peaks observed at are deconvoluted into two Gaussian peaks, and ( or 3), as shown by the dashed lines. All the emission peaks observed at exhibit a small amount of splitting (, vertical solid lines).
ZPL emission spectra for (a) phosphor at and 300 K and (b) phosphor at . The ZPL peak observed in at lower temperatures exhibits a small amount of splitting .
Plots of (a) ZPL energy, (b) Stokes and anti-Stokes intensities , and (c) their ratio vs temperature for the emission peak in phosphor. The solid lines are calculated from (a) Eq. (2), (b) Eq. (3), and (c) Eq. (5).
Integrated PL intensity vs temperature for phosphor. The solid line represents the result calculated using Eq. (8).
Stokes vibronic modes in (space ) and (space ) at 300 K (in meV). The data are taken from Refs. 9 and 10.
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