V. Dierolf et al., High-resolution site selective optical spectroscopy of rare earth and transition metal defects in insulators, J LUMINESC, 87-9, 2000, pp. 989-991
Focusing on Er3+ ions in stoichiometric LiNbO3 we demonstrate the applicati
on of the combined excitation emission spectroscopy to defect systems with
complicated multi-line spectra in insulating materials. After spectroscopic
identification of the different defect types ("sites") the changes under a
pplication of external perturbation (hydrostatic pressure, electric and mag
netic fields) are investigated obtaining useful results about the electroni
c states. As a major result it is shown that even smallest spectral changes
(Delta E < 0.1 meV) can be detected site selectively. In a similar way, th
e method has been applied to other defect systems. (C) 2000 Elsevier Scienc
e B.V. All rights reserved.