Anti-Stokes luminescence of BaY2F8 crystals with coactivation by Tb3+ and Yb3+ ions
Zubareva A.M., Nizamutdinov A.S., Minnebaev T.M., Oleinikova E.I., Shakirov A.A.
Kazan (Volga Region) Federal University, Institute of Physics, Russia
Abstract
Nowadays materials in which it is possible to observe the processes of anti-Stokes luminescence find their application not only in the field of science, but also in practical applications [1, 2]. Materials with coactivation with Tb-Yb ions are of particular interest, since energy transfer occurs between these doping ions, which is accompanied by cross-relaxation processes of terbium ions with energy transfer between the following levels: 5D3, 7F6 --> 5D4, 7F0. This process becomes possible because the energy difference between levels 5D3-5D4 and 7F0-7F6 is almost the same [3].
In this work, the spectral and kinetic characteristics of BaY2F8:5%Tb3+-x%Yb3+(x=2, 5, 10) crystals were investigated. Absorption spectra, anti-Stokes luminescence spectra under pulsed excitation at 980 nm and luminescence kinetics were recorded and interpreted. Antistokes luminescence was detected at the transitions from the 5D3 and 5D4 states (~380 nm, ~540 nm). The cooperative sensibilization of terbium ions was found to involve a two- or three-photon energy transfer process between the following levels: 2Yb(2F5/2)-->Tb(5D4) [4], 2Yb(2F5/2)+Yb(2F5/2)-->Tb(5D1)-->Tb(5D3) [5]. The discovered process of energy transfer to terbium ions was found to be efficient, which makes the investigated materials promising anti-Stokes light converters.
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Speaker
Anna Zubareva
Kazan Federal University
Russia
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