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8389068 
Journal Article 
Review 
Luminescence Spectroscopy and Origin of Luminescence Centers in Bi-Doped Materials 
Krasnikov, A; Mihokova, Eva; Nikl, M; Zazubovich, S; Zhydachevskyy, Y 
2020 
MDPI 
BASEL 
10 
3 
208 
WOS:000523512100002 
Bi-doped compounds recently became the subject of an extensive research due to their possible applications as scintillator and phosphor materials. The oxides co-doped with Bi3+ and trivalent rare-earth ions were proposed as prospective phosphors for white light-emitting diodes and quantum cutting down-converting materials applicable for enhancement of silicon solar cells. Luminescence characteristics of different Bi3+-doped materials were found to be strongly different and ascribed to electronic transitions from the excited levels of a Bi3+ ion to its ground state, charge-transfer transitions, Bi3+ dimers or clusters, radiative decay of Bi3+-related localized or trapped excitons, etc. In this review, we compare the characteristics of the Bi3+-related luminescence in various compounds; discuss the possible origin of the corresponding luminescence centers as well as the processes resulting in their luminescence; consider the phenomenological models proposed to describe the excited-state dynamics of the Bi3+-related centers and determine the structure and parameters of their relaxed excited states; address an influence of different interactions (e.g., spin-orbit, electron-phonon, hyperfine) as well as the Bi3+ ion charge and volume compensating defects on the luminescence characteristics. The Bi-related luminescence arising from lower charge states (namely, Bi2+, Bi+, Bi-0) is also reviewed. 
Luminescence; excitons; defects; excited states; interactions; Bi-doped compounds; Bi3+, Bi2+, Bi+, Bi-0 centers; Bi3+ dimers