Luminescence characteristics of Bi3+-activated oxides

Abstract

The value of the Stokes shift of the emission of BiS÷-activated oxides can be related to the optical trap depth, i.e. the energy difference between the sp~ and the sP o level. A useful interpretation of the luminescence properties of these materials seems to be possible starting from this point of view.

The luminescence of yitria stabilized zirconia doped with Bi2O3

“…400 cm -I [ref . 5] • IS 0 ÷ IP 1 transition is at about I0.000 cm -I higher energy than the The IS 0 + 3P 1 transition, so that it is expected at about 250 nm in the case of ZYB. However, it is not observed in our excitation spectrum.…”

Study on shaped single crystal growth and scintillating properties of Bi‐doped rare‐earth garnets

“…However, it is well established that position of Bi 3+ emission in different hosts can vary a lot because of local distortions of Bi surrounding due to its excitation, which may result in an extended relaxation processes [14]. Stokes shifts (difference in energy between the absorption and emission band maxima) from about 0.4 eV up to 2.4 eV were reported in the literature [15]. Thus, Bi-doped YGG belongs to the compounds with smaller distortion of Bi polyhedron, restricted relaxation of its excited state and Stokes shift is calculated of only 0.36 eV.…”

The luminescence of Cs2NaSbCl6 AND Cs2NaSbBr6: a transition from a localized to a delocalized excited state

“…Furthermore, table 2 shows that AE decreases when the Stokes shift increases. This is a quite common situation for isolated s* ions [ 3,17,20], and has been explained in terms of quenching of the spin-orbit interaction by the Jahn-Teller effect [ 2 11. The only difference between the diluted and the concentrated system is the temperature quenching, which for Cs,NaSbCl, starts at about 200 K, while for Cs2NaMClb-Sb3+ no temperature quenching is observed up to room temperature.…”