Luminescence and excited state dynamics of Bi3+ centers in Y2O3
PBN-AR
Instytucja
Instytut Fizyki Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
JOURNAL OF LUMINESCENCE
ISSN
0022-2313
EISSN
Wydawca
ELSEVIER SCIENCE BV
DOI
URL
Rok publikacji
2015
Numer zeszytu
Strony od-do
268-277
Numer tomu
167
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
en
Photoluminescence Time-resolved spectroscopy Excited states Bi3+ centers Y2O3 nanopowders
Streszczenia
Język
en
Treść
Photoluminescence of Y2O3:Bi nanopowder synthesized by the modified sal-gel method is studied using time-resolved luminescence spectroscopy in the 4.2-300 K temperature range. Bi3+ ions are substituted for Y3+ ions in two different crystal lattice sites, one having S-6 symmetry (Bi(S-6)) and the other C-2 symmetry (Bi(C2)). The luminescence characteristics of these two centers are found to have strongly different electron-phonon interactions. The luminescence of Bi(S-6) and Bi(C-2) centers peak at 3.04 eV and 2.41 eV, respectively, and arise from the radiative decay of the triplet relaxed excited state (RES) of Bi3+ ions. The model and structure of the RES, responsible for the luminescence of Bi(S-6) and Bi(C-2) centers in Y2O3:Bi, as well as radiative and nonradiative processes, taking place in the excited states of these centers, are investigated. The parameters of the triplet RES (the separation between the metastable and radiative levels and probabilities of radiative and nonradiative transitions from these levels) are determined. Low-temperature quenching of the triplet luminescence of these centers is explained by nonradiative quantum tunneling transitions from the metastable minima of their triplet RES to closely located defect- or exciton-related levels.
Cechy publikacji
Oryginalny artykuł naukowy
Oryginalny artykuł naukowy przedstawia rezultaty oryginalnych badań naukowych lub eksperymentu.
Original article
Original article presents the results of original research or experiment.
Inne
System-identifier
PBN-R:694296
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