Investigation of the Luminescence in the SrS: Bi³⁺Phosphor by Time-Resolved Emission Spectroscopy

Luminescence Spectroscopy and Origin of Luminescence Centers in Bi-Doped Materials

“…Luminescence properties of all Bi 3+ -doped alkaline-earth oxides [79,84,85,88,89,91,133,[232][233][234][235][236][237][238][239], sulfides [84,[86][87][88][89][90] and fluorides [92] are similar ( Table 1). The triplet emission of Bi 3+ ions in these materials shows the extremely small Stokes shift and FWHM and the extremely large energy D of the spin-orbit splitting of the triplet RES (up to 265 meV in CaF 2 [92]).…”

“…This indicates that mainly the metastable minima of the triplet RES are populated in the process of the excited state relaxation. In many systems, vibronic structure of the emission band and the lowest-energy excitation band was observed at low temperatures (see, e.g., [84,86,[88][89][90][91][92]133,234]). All the observed features are caused by an extremely weak electron-phonon interaction characteristic for these materials.…”

“…The only stable Bi isotope 209 Bi has a nuclear spin of I = 9/2. Therefore, in Bi 3+ -doped compounds with a weak vibronic interaction, such as alkali-earth oxides, sulfides, fluorides (see, e.g., [84,86,[88][89][90][91][92] [68] and references therein), where the Stokes shift is extremely small (see Table 1) and even a vibronic structure of the emission and excitation spectra is observed at low temperatures, mainly the hyperfine interaction can be expected to be responsible for the radiative decay of the metastable 3 P 0 -related level. The influence of the hyperfine interaction on the probability of the radiative 3 P 0 → 1 S 0 transitions in Bi 3+ -doped alkali-earth oxides was investigated in [133].…”

Optical properties of strontium monochalcogenides from first principles

“…4 The available experimental results on the reflectivity and absorption of SrX compounds are mostly limited to the excitonic transitions. [5][6][7][8][9] In the optical frequency range, Kaneko and Morimoto 10,11 have measured the reflectivity and imaginary part of the dielectric function for SrSe and SrS. But for SrTe, to our knowledge, there are not yet any experimental results on these quantities in the optical frequency range.…”