Related Experiment Video
Updated: Jun 8, 2025
07:24
Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
Published on: April 14, 2020
17.0K
Nonstoichiometry as a hidden aspect of TbAl3(BO3)4 optical properties
A B Kuznetsov1, A Y Jamous1,2, M I Rakhmanova3
1Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk 630090, Russia. ku.artemy@igm.nsc.ru.
Dalton Transactions (Cambridge, England : 2003)
|November 1, 2024
Summary
Non-stoichiometric terbium aluminum borate (TbAl3(BO3)4) crystals exhibit tunable green luminescence and enhanced nonlinear optical properties. Deviations from stoichiometry impact quantum efficiency but improve second-harmonic generation (SHG) efficiency compared to KDP.
Area of Science:
- Materials Science
- Solid State Chemistry
- Crystallography
Background:
- Terbium aluminum borate (TbAl3(BO3)4) is a material with potential applications in optics.
- Understanding its stoichiometry is crucial for optimizing its properties.
- Previous studies have focused on stoichiometric synthesis, but non-stoichiometry may offer unique advantages.
Purpose of the Study:
- To synthesize and characterize non-stoichiometric Tb1+xAl3-x(BO3)4 single-phase compositions.
- To investigate the effect of stoichiometry on the luminescence and second-harmonic generation (SHG) properties.
- To explore crystal growth using a K2Mo3O10-B2O3-Al2O3 flux.
Main Methods:
- Solid-state synthesis in the TbBO3-(Al2O3·B2O3) system.
- Flux crystal growth using K2Mo3O10-B2O3-Al2O3.
- Characterization of crystal structure (R32 space group).
- Optical measurements of luminescence and SHG efficiency.
Main Results:
- Single-phase Tb1+xAl3-x(BO3)4 compositions (x = -0.1 to 0.15) were successfully synthesized.
- Crystals grown with x = 0.06 and 0.09 exhibited green luminescence due to Tb3+ 5D3 → 7F6 transition.
- Non-stoichiometry decreased luminescence quantum efficiency but increased SHG efficiency by 1.82 and 1.53 times compared to KDP.
Conclusions:
- TbAl3(BO3)4 is not strictly stoichiometric, with tunable non-stoichiometric compositions possible.
- Optimizing stoichiometry is key to balancing luminescence quantum efficiency and nonlinear optical performance.
- Non-stoichiometric Tb1+xAl3-x(BO3)4 crystals show promise for advanced optical applications.
Related Concept Videos
02:52Stereoisomerism
11.8K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
11.8K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
41.6K
Tetrahedral 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,...
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,...
41.6K
02:27Predicting Molecular Geometry
34.1K
VSEPR Theory for Determination of Electron Pair Geometries
34.1K
02:42Valence Bond Theory
8.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.5K
03:02Colors and Magnetism
11.6K
Color in Coordination Complexes
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...
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...
11.6K
02:24Properties of Enantiomers and Optical Activity
16.8K
It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
16.8K