Photoluminescence origin in Bi3+-doped GdAlO3 perovskite
Baran M. Hreb V. Kissabekova A. Krasnikov A. Laguta V.V. Vasylechko L. Zazubovich S. Zhydachevskyy Y.
December 2025Elsevier B.V.
Journal of Luminescence
2025#288
Microcrystalline powders of GdAlO3:Bi with different bismuth concentrations were synthesized by the modified sol-gel method. The pure orthorhombic perovskite structure of the investigated samples was confirmed by X-ray diffraction. Photoluminescence characteristics of GdAlO3:Bi were investigated in the 4.2–500 K temperature range by the methods of steady-state and time-resolved luminescence spectroscopy. The ultraviolet emission spectrum of GdAlO3:Bi is found to consist of two bands. The dominating 3.72 eV band is assigned to the electron transitions from the emitting and metastable levels of the triplet relaxed excited state of a single Bi3+ center, corresponding to the 3P1,0 → 1S0 transitions of the free Bi3+ ion. A weak ≈3.65 eV band is attributed to the dimer {Bi3+ - Bi3+} center. The visible emission spectrum consists of two bands of an exciton origin centered at about 2.5 eV and 2.3 eV and assigned to the excitons localized around the single Bi3+ ions and dimer {Bi3+ - Bi3+} centers, respectively. The electron-transfer processes in the {Bi3+- Bi3+} pairs resulting in the appearance of the {Bi3+- Bi3+}-related UV and VIS luminescence are suggested. The influence of the magnetic field, created at the Bi3+ site by the magnetically ordered Gd3+ sublattice, on the decay kinetics of the triplet Bi3+ emission is found to be negligible. The effect of energy-transfer processes on the decay kinetics of this emission is discussed. The energies of the Bi3+ → Gd3+ and Bi3+ → Bi3+ electron-transfer transitions in GdAlO3:Bi are estimated.
Dimers , GdAlO3:Bi3+ , Localized excitons , Magnetic field , Time-resolved luminescence spectroscopy , XRD
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Łukasiewicz Research Network–Institute of Microelectronics and Photonics, Wólczyńska 133, Warsaw, 01-919, Poland
Lviv Polytechnic National University, Bandera 12, Lviv, 79013, Ukraine
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
Institute of Physics of the Czech Academy of Sciences, Cukrovarnicka 10, Prague, 16200, Czech Republic
Institute of Physics of the Polish Academy of Sciences, Al. Lotników 32/46, Warsaw, 02-668, Poland
Berdyansk State Pedagogical University, Shmidta Str. 4, Berdiansk, 71100, Ukraine
Łukasiewicz Research Network–Institute of Microelectronics and Photonics
Lviv Polytechnic National University
Pavlodar Pedagogical University
L.N. Gumilyov Eurasian National University
Institute of Physics
Institute of Physics of the Czech Academy of Sciences
Institute of Physics of the Polish Academy of Sciences
Berdyansk State Pedagogical University
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