Visible to infrared low temperature photoluminescence of rare earth doped bismuth germanate crystals.
In this paper, the influence of a series of rare earth (Eu, Tm, Nd) and Cr ion doping on the optical properties of BGO was investigated by means of photoluminescence (PL) from visible to IR region in the 10-300K temperature range using different types of detectors, namely, photomultiplier tube (PMT), InGaAs (IGA), and Si. Several samples were investigated having dopants concentrations of 0.3wt%Nd, 0.4wt%Tm, 0.06wt% Cr and 3ppm Eu. The PL spectra of the samples showed different luminescence behaviour which is assigned to the 4f intra shell transition from rare earth ions. The temperature dependence of the PL from rare earth doped BGO crystals is also examined.
Near infrared photoluminescence of Mg, Ca doped Bi4Ge3O12 crystals and glasses
Abstract Spectral properties in Mg and Ca doped Bi 4 Ge 3 O 12 (BGO) crystals and glasses were investigated. Near-infrared (NIR) photoluminescence was observed in Mg and Ca doped Bi 4 Ge 3 O 12 (BGO) crystals, while NIR emission in doped BGO glasses was very weak. There is no fundamental difference about NIR emission between Mg 2+ and Ca 2+ doped BGO crystals, and the emission center is still related to Bi ions, the doped ions can influence energy level of Bi ions.
An electron paramagnetic resonance study of Er3+ in Bi4Ge3O12 single crystals
The X‐band electron paramagnetic resonance study of Er‐doped Bi4Ge3O12 single crystals at 5 K is reported. The spectra have been attributed to Er3+ ions in the Bi3+ site, confirming the assumed trigonal site symmetry of Er3+ in previous crystal‐field analysis. A detailed study of the measured g‐factor values indicates that corrections to the existing crystal‐field parameters Bnm should be performed. It is suggested that corrections to the sixth‐rank parameters are particularly important, in agreement with spin‐correlated crystal‐field (SCCF) effects for Er3+.