Optical spectroscopy of electronic centers in solids

Novel Blue-Emitting NaxCa1-xAl2-xSi2+xO8:Eu2+(x= 0.34) Phosphor with High Luminescent Efficiency for UV-Pumped Light-Emitting Diodes

“…Especially, the lifetime of Eu 2+ decreased from 0.577 μs to 0.490 μs when Eu 2+ concentration increased from 1 to 11 mol %. The measured lifetime is related to the total relaxation rate, which can be described by; 23,24 …”

Visible and infrared luminescence study of Er doped β-Ga2O3and Er3Ga5O12

“…One couple of green and IR set of peaks are obtained with each excitation wavelength. It is well known that differences in the symmetry and strength of the crystal field result in changes of the splitting of the RE ion electronic levels, implying that both the emission and the excitation energies change for different centres [22]. This fact allows the selection of luminescence from a particular emitting centre, in a sample containing different kinds of centres, through the excitation photon energy [23].…”

Local field dependent fluorescence properties of Eu3+ ions in a fluorometaphosphate laser glass

“…The inherent disordered structure of glasses leads to a distribution of environments for the lanthanide (Ln) ions with small differences in the Ln 3+ -ligand bond distances and angles [1,2]. The main effect is an inhomogeneous broadening of the absorption and emission spectral profiles of the intra-configurational transitions between multiplets of the Ln 3+ ions in the optical range.…”