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Growth and Various Characterizations of Lithium Sulfate Monohydrate Single Crystals after Eu 3+ and Tb 3+ Ion Doping
Author(s) -
Najar Fayaz A.,
Naik Mudassar M.,
Mir Feroz A.,
Vakil Gowher B.,
Want Basharat
Publication year - 2020
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.202000075
Subject(s) - photoluminescence , monoclinic crystal system , materials science , doping , raman spectroscopy , dopant , analytical chemistry (journal) , crystal (programming language) , spectroscopy , band gap , dielectric , lithium sulfate , crystal structure , ion , crystallography , chemistry , optics , ionic bonding , optoelectronics , programming language , physics , chromatography , quantum mechanics , computer science , organic chemistry
A slow evaporation solution growth technique is used to grow rare earth (Eu 3+ and Tb 3+ ) doped lithium sulfate monohydrate (LSMH) single crystals. X‐ray diffraction analysis of these crystals confirms the monoclinic crystal structure with P 2 1 space group. Energy dispersive X‐ray spectroscopy is used to check the incorporation of dopants into the crystal lattice of these LSMH crystals. Dielectric, UV–vis photoluminescence spectroscopy studies are carried out to study the electrical and optical behavior of these crystals. The optical bandgap decreases by doping and the current material follows the direct allowed transition. The dielectric constant and ac conductivity slightly increase with the incorporation of Eu 3+ and Tb 3+ ions in the crystal matrix. The effect of doping on the functional groups of LSMH crystals is confirmed by Fourier transform infrared spectroscopy. The micro‐Raman spectroscopic technique is carried out on these samples, confirming the stress experienced by the crystal with dopants, and further leading to the degradation of the crystal structure. The photoluminescence emission with a large decay time of the as‐grown crystals is dominated by the 5 D 0 → 7 F j transitions of Eu 3+ and 5 D 4 → 7 F j transitions of Tb 3+ ions, and further provides a possibility of using them as potential optical materials.