Optical properties of europium compounds of the formulae: Eu(NCS)(3)centerdot 2[N-4(CH2)(6)]center dot 8H(2)O and Eu(NO3)(3)center dot 2[N-4(CH2)(6)]center dot 10H(2)O
M. Zalewicz et al., Optical properties of europium compounds of the formulae: Eu(NCS)(3)centerdot 2[N-4(CH2)(6)]center dot 8H(2)O and Eu(NO3)(3)center dot 2[N-4(CH2)(6)]center dot 10H(2)O, J ALLOY COM, 300, 2000, pp. 488-494
Optical spectra of two types of europium compounds of the formulae: Eu(NCS)
(3). 2[N-4(CH2)(6)]. 8H(2)O (1) and Eu(NO3)(2). 2[N-4(CH2)(6)]. 10H(2)O (2)
at room and low temperatures are reported. The probabilities of f-f transi
tions were analysed and their temperature dependencies were explained. Unus
ually high oscillator strength values were found, particularly for europium
thiocyanate. Comparison of the spectroscopic properties of the powder disc
sample with the single crystal spectra was made. Absorption and excitation
spectra of the title compounds in the region of f-f and C-T transitions in
the 4.2-293 K range were studied and the vibronic components were assigned
on the basis of IR and Raman data. Temperature dependence of the relative
intensities of luminescence lines was examined and luminescence quenching w
as considered. The decay rimes for deuterated and non-deuterated samples we
re measured and the non-radiative processes were analysed. (C) 2000 Elsevie
r Science S.A. All rights reserved.