Raman, photoluminescence, and a.c. electrical studies of pure and l -serine doped ammonium dihydrogen phosphate single crystals: an understanding of defect chemistry in hydrogen bonding
| Autor: | H. O. Jethva, Girish M. Joshi, Mihir J. Joshi, K. D. Parikh, J. H. Joshi |
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| Rok vydání: | 2018 |
| Předmět: |
Photoluminescence
02 engineering and technology Dielectric 01 natural sciences Catalysis Quantitative Biology::Subcellular Processes Condensed Matter::Materials Science chemistry.chemical_compound symbols.namesake Condensed Matter::Superconductivity Stokes shift 0103 physical sciences Materials Chemistry 010302 applied physics Quantitative Biology::Biomolecules Dopant Doping General Chemistry 021001 nanoscience & nanotechnology Ammonium dihydrogen phosphate chemistry symbols Physical chemistry Charge carrier 0210 nano-technology Raman spectroscopy |
| Zdroj: | New Journal of Chemistry. 42:17227-17249 |
| ISSN: | 1369-9261 1144-0546 |
| DOI: | 10.1039/c8nj03393e |
| Popis: | Ammonium dihydrogen phosphate (ADP) crystals have a wide range of nonlinear optical applications. The hydrogen bond side chain contains dopant like L-serine causing defects in ADP. The pure and L-serine doped ADP crystals are grown using a slow evaporation technique. The powder XRD patterns show the single-phase nature of the pure and doped ADP crystals. The FT-Raman spectra show the presence of a variety of normal modes of vibrations of ADP. The photoluminescence study suggests an increase of the Stokes shift and the presence of vibrational energy relaxation phenomena. a.c. electrical studies such as dielectric, impedance and modulus spectroscopy were carried out to elucidate the behaviour of the charge carrier under the course of the alternating electrical field. The defect oriented correlated barrier hopping (CBH) conduction mechanism, the presence of grains and grain boundaries, and the non-Debye type relaxation phenomena are explained. The nonlinear second harmonic generation efficiency of the grown crystals is found to be improved on doping L-serine in ADP. |
| Databáze: | OpenAIRE |
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