On the excitation mechanism of the Bi3+ - Related localized exciton luminescence in Bi3+ - Doped aluminum garnets
Baran M. Kissabekova A. Krasnikov A. Vasylechko L. Zazubovich S. Zhydachevskyy Y.
November 2023Elsevier B.V.
Journal of Luminescence
2023#263
Microcrystalline powders of Bi3+-doped Y3Al5O12 and Lu3Al5O12 garnets have been studied by the X-ray diffraction, steady-state and time-resolved photoluminescence, and thermally stimulated luminescence methods. The conclusion is made that the excitation spectra of the Bi3+-related visible exciton-like emission of these compounds, which are located in the 4–6 eV energy range, cannot be explained by the charge-transfer transitions between the energy levels of Bi3+ and the conduction or valence band of the host, whose energies exceed 6 eV. To explain the features observed, this emission is suggested to appear due to the photostimulated electron transfer from the ground state of a Bi3+ ion to defect levels located in the band gap, resulting in the creation of temporary pairs of electron centers and hole Bi4+ centers. A hole delocalization from the Bi4+ ion to the neighboring oxygen O2− ion is also suggested, resulting in the creation of the {O− - Bi3+}-type hole center. As a result of the electron recombination with this hole center, the exciton localized around the Bi3+ ion is formed whose radiative decay is accompanied with the visible emission.
Charge transfer , Exciton , Hole centers , Lu3Al5O12:Bi , Luminescence , Y3Al5O12:Bi
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Łukasiewicz Research Network - Institute of Microelectronics and Photonics, Wólczyńska 133, Warsaw, 01-919, Poland
Pavlodar Pedagogical University, Mira 60, Pavlodar, 140000, Kazakhstan
L.N. Gumilyov Eurasian National University, Satpayev Str.2, Astana, 10008, Kazakhstan
Institute of Physics, University of Tartu, W. Ostwald 1, Tartu, 50411, Estonia
Lviv Polytechnic National University, Bandera 12, Lviv, 79013, Ukraine
Institute of Physics, Polish AS, Al. Lotników 32/46, Warsaw, 02-668, Poland
Łukasiewicz Research Network - Institute of Microelectronics and Photonics
Pavlodar Pedagogical University
L.N. Gumilyov Eurasian National University
Institute of Physics
Lviv Polytechnic National University
Institute of Physics
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