Origin of luminescence in Bi3+ - doped lanthanide niobates
Baran M. Belikov K.N. Kissabekova A. Krasnikov A. Lushchik A. Mihokova E. Tsiumra V. Vasylechko L. Zazubovich S. Zhydachevskyy Y.
5 April 2021Elsevier Ltd
Journal of Alloys and Compounds
2021#859
Photoluminescence characteristics of the undoped and Bi3+-doped lanthanide niobates are investigated by the steady-state and time-resolved spectroscopy methods in a wide temperature range of 4.2–500 K. The broad visible emission bands with the large Stokes shifts are found to arise from the triplet relaxed excited states characterized by a small (∼1 meV) spin-orbit splitting energy. This indicates the exciton-like origin of all the observed emission bands. The data allow to conclude that the Bi3+-related triplet relaxed excited state is located inside the conduction band. No ultraviolet emission caused by the radiative decay of the triplet relaxed excited state of a Bi3+ ion is observed. The dependences of the emission intensity on the Bi3+ content indicate that the complex visible emission band of the Bi3+-doped niobates consists of two main, the higher-energy and the lower-energy, components arising from the excitons localized around the single Bi3+ ions and the {Bi3+ - Bi3+} dimers, respectively. The processes resulting in the appearance of the exciton-like emission under photoexcitation in the Bi3+-related absorption bands are discussed.
Bi3+ , Exciton-like states , Lanthanide niobates , Photoluminescence , Time-resolved spectroscopy
Text of the article Перейти на текст статьи
Institute of Electronic Materials Technology, Wólczyńska 133, Warsaw, 01-919, Poland
Institute for Single Crystals, 60 Nauka Avenue, Kharkiv, 61001, Ukraine
Institute of Physics, University of Tartu, W. Ostwaldi 1, Tartu, 50411, Estonia
L.N. Gumilyov Eurasian National University, Satpayev 2, Nur-Sultan, 010008, Kazakhstan
Institute of Physics of the Czech Academy of Sciences, Cukrovarnicka 10, Prague, 16200, Czech Republic
Institute of Physics, Polish AS, Al. Lotników 32/46, Warsaw, 02-668, Poland
Ivan Franko National University of Lviv, 107 Tarnavskoho Str, Lviv, 79017, Ukraine
Lviv Polytechnic National University, Bandera 12, Lviv, 79013, Ukraine
Institute of Electronic Materials Technology
Institute for Single Crystals
Institute of Physics
L.N. Gumilyov Eurasian National University
Institute of Physics of the Czech Academy of Sciences
Institute of Physics
Ivan Franko National University of Lviv
Lviv Polytechnic National University
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026