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J. JOSEPH1, V. MATHEW1, K. E. ABRAHAM2,*
Conditions for the growth of crystals of Mn doped Barium Tartrate (BaTr) by controlled ionic diffusion of reactants through silica hydrogel have been optimized. The confirmation of the crystal formation was done by carrying out Powder XRD and TGA. Here the authors made an attempt to explore the photo-electronic properties of the prepared crystal and noticed that they are very much influenced by the presence of defects in the original crystal lattice. Photoconductivity (PC) studies of the material as a function of time, intensity of irradiation light, annealing temperature; applied voltage and concentration of the dopant (Mn) are studied. Electro luminescence (EL) of BaTr crystals are measured with the help of a photomultiplier tube (PMT) and its EL brightness is measured as a function of voltage of excitation at different annealing temperature and concentration of Mn. The imperfections in the crystal lattice some times act as traps or as recombination centers. Luminescent centers forms at the cracks, voids, dislocations and stacking faults. These defects provide sites for the precipitation of the excess carriers if it is produced.
X-ray diffraction, Photo conductivity, Electro luminescence.
J. JOSEPH, V. MATHEW, K. E. ABRAHAM, Structural, photoconductivity and electro-luminescence studies of Mn doped Barium Tartrate crystals, Optoelectronics and Advanced Materials - Rapid Communications, 2, 11, November 2008, pp.707-713 (2008).
Submitted at: Sept. 19, 2008
Accepted at: Oct. 30, 2008
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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