Broadband NIR photoluminescence (from 1000 to 2500 nm) was observed from partially reduced AlCl₃/ZnCl₂/BiCl₃ glass, containing subvalent bismuth species. The luminescence consists of three bands, assigned to Bi⁺ , Bi₂⁴⁺, and Bi₅³⁺ ions. The physical and optical characteristics of these centers and possible contribution to NIR luminescence from bismuth-doped oxide glasses are discussed.
We observed an intensive near-infrared luminescence in Bi-doped KAlCl4
polycrystalline material. Luminescence dependence on the excitation wavelength
and temperature of the sample was studied. Our experimental results allow
asserting that the luminescence peaked near 1 um belongs solely to Bi+ ion
which isomorphically substitutes potassium in the crystal. It was also
demonstrated that Bi+ luminescence features strongly depend on the local ion
surroundings
Temperature behavior of the Bi+ center emission, excitation bands and
luminescence decay law in KAlCl4 crystal are investigated. Abrupt changes of
the monocation optical properties are observed at phase transitions of the
host. The observed optical transitions are assigned to the specific energy
states of Bi+ ion. It is shown that two thermalized levels are responsible for
the luminescence. The experimental temperature behavior of the emission and
excitation bands are in agreement with theory of electron-phonon interaction of
impurity centers in solids; the effective-phonon frequencies and Huang-Rhys
parameters are estimated. The configuration coordinate diagram is determined
for the Bi+ center in KAlCl4 crystal
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