Repositori URV

Identificador: PC:3315

Handle: https://hdl.handle.net/20.500.11797/PC3315

Autors:
Mateos, X.Loiko, P.Vilejshikova, E. V.Serres, J. M.Dunina, E. B.Kornienko, A.Yumashev, K.Aguiló, M.Díaz, F.

Resum:
We report on a detailed spectroscopic study of Eu3+ ions in the monoclinic KYb(WO4)2 crystal. The polarized room and low-temperature absorption spectra are measured. The maximum ¿abs corresponding to the 7F1 ¿ 5D1 transition is 1.32×10-20 cm2 at 534.2 nm with a bandwidth of 0.7 nm (for E || Nm). The Stark sub-levels of the excited mulitplets are determined. A Judd-Ofelt analysis is applied to the Eu3+:KYb(WO4)2 crystal to determine the probability of spontaneous transitions, radiative lifetimes and luminescence branching ratios. Within the strong configuration interaction (SCI) approxi-mation, the intensity parameters are ¿2 = 4.757, ¿4 = 2.295, ¿6 = 1.644 [10-20 cm2] and ¿f = 50160 cm¿1. The radiative lifetime of the 5D0 state is 351 µs. The maximum stimulated-emission cross-section corresponding to the 7F1 ¿ 5D1 transition is 1.44×10-20 cm2 at 703.2 nm (for E || Nm). Under UV excita-tion, the Eu3+: KYb(WO4)2 crystal provides intense red photoluminescence with CIE coordinates, x = 0.675, y = 0.325.