Optical spectroscopy of Eu3+ ions doped in KLu(WO4)2 single crystals

Europium single doped potassium lutetium tungstate Eu3+:KLu(WO4)(2) single crystals have been grown with the top seeded solution growth slow cooling method. Their absorption spectra are studied in detail for principal light polarizations, E parallel to INp, N-m and N-g at room and low temperatures. The absorption oscillator strengths parameters are calculated by means of the theory of f-f transition intensities for systems with anomalously strong configuration interaction and by Judd-Ofelt theory. The Omega(t) (t=2, 4, 6) intensity parameters, and the {O-dk, O-ck, Delta(d), Delta(c1) and Delta(c2)) (k=1, 2, 3) ASCI parameters are calculated. The radiative transition rates A(R), radiative lifetimes tau(R), and fluorescent branching ratios beta(R) associated with D-5(0)-F-7(j) transitions of Eu3+ were determined. The calculated decay times are discussed and compared with experimental values. (C) 2015 Elsevier B.V. All rights reserved.