Judd-Ofelt modeling, emission lifetimes and non-radiative relaxation for Er3+ doped Cs2NaYF6 elpasolite crystals

Identifier:  imarina:9298954

Handle: https://hdl.handle.net/20.500.11797/imarina9298954

Authors:  Loiko, PA; Vilejshikova, EV; Khaidukov, NM; Méndez-Ramos, J; Mateos, X; Yumashev, KV

Abstract:
Absorption and emission properties of Er3+ ions in a cubic elpasolite crystal, Cs2NaYF6, are modeled within the Judd-Ofelt (J-O) theory. The J-O intensity parameters have been determined: ohm(2) = 0.665, ohm(4) = 0.217 and ohm(6) = 0.029 x 10(-20) cm(2). The elpasolite structure of Cs2NaYF6 containing isolated [YF6] polyhedra allows high Er3+ doping levels up to 100 at% without considerable concentration quenching of luminescence and exceptionally long lifetimes of the excited states (in particular, the radiative lifetimes of the I-4(13/2) and I-4(11/2) states are as long as 36.7 ms and 113.4 ms, respectively). It also shows weak non radiative relaxation. Stimulated-emission cross-sections have been determined for the Er3+ transitions in Cs2NaYF6 at similar to 2.7 and similar to 1.5 m as well as in the visible spectral range. (C) 2017 Elsevier B.V. All rights reserved.