Related Experiment Video
Updated: Mar 20, 2026

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
Published on: April 14, 2020
[Fluorescent Characteristics of Strontium Tetraborate (SrB4O7) Doped with Divalent Lanthanide Elements]
Abstract:
Strontium borate doping with different lanthanide bivalent ions and concentration (SrB4O : Re2+) were synthesized by the high-temperature solid state method. The fluorescent spectral characteristics of SrB4O7 : Re2+ were investigated by the non-polarization con-foucus fluorescence/raman measurement system built by us. The results indicate that the fluorescent spectral characteristics of SrB4O7 : Re2+ is very similar to that of SrB4O7 : Sm2+. The most strong fluorescence line (0-0 line) arises from 5D0 - 7F0 electron transition and the wavelength is 685.41 nm. In addition, two fluorescent bands coming from 5D0 - 7F1 and 5D0 -7F2 electron transition are observed near 700 and 730 nm, respectively. The intensity of 0-0 line of SrB4O7 : Re2+ is at least a magnitude smaller than that of SrB4O7 : Sm2+. A further study on the fluorescent spectrums of SrB4O7 : Re2+ shows that the doping elements and concentration both are the key points that affect the intensity of the fluorescent peaks, which directly decide the amount of Re2+ concerned with irradiance.
Related Concept Videos
Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
Ionic Bonding and Electron Transfer
Photoluminescence: Applications
Variables Affecting Phosphorescence and Fluorescence
Properties of Transition Metals
Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...

