Determination of some optoelectrical and thermodynamic parameters of β-lithium ammonium sulphate crystals

Najar, Fayaz A.; Naik, Mudassar M.; Farooq, Majid; Vakil, Gowher B.

doi:10.1007/s00339-020-03981-w

Cited by 6 publications

(6 citation statements)

References 51 publications

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“…6 is attributed to the low attenuation due to absorption and scattering though the wavelength range. A similar type of response is exhibited by other crystals of this family in our earlier work [40]. It has been observed that there is a correlation between the n and E g , the value of n increases with decreases in band gap that is the crystals with higher refractive index have narrow band gaps.…”

Section: Refractive Index and Extinction Coe Cientsupporting

confidence: 81%

“…2. In our previous work these crystals were already studied by using single crystal/powder X-ray diffraction (XRD), Energy dispersive X-ray analysis (EDAX), Infrared (IR) spectroscopy, optical (UV-Visible/Photoluminescence) and dielectric spectroscopic analysis measurements [15,27]. Dual-beam Varian Carry 500 spectrophotometer was used to study the optical parameters from absorbance, transmittance and re ectance spectra of pure and doped LSMH crystals.…”

Section: Methodsmentioning

confidence: 99%

“…The creation of defects in such types of crystals produces structural disorder as a consequence of [31]. The defect states induced in the band gap, which is appearing as band edge and hence reducing the optical band gap [27,32]. The wide band gap and elevated transmittance depicted by LSMH crystals projected them as desired candidates for optoelectronic application [33][34][35].…”

Section: Transmittance Re Ectance and Absorbance Spectramentioning

confidence: 99%

“…It was observed that less heed has been given to investigate the various optoelectrical parameters like linear/non-linear optical refractive index (n/n 2 ), optical extinction coe cient (k), dispersion parameters, Lorentz-Drude parameters, chemical/optical hardness, optical conductivity and electronic polarizability after literature survey on LSMH crystals. As LSMH crystal has a wide optical band gap of 4.49 eV [27], hence such parameters should be investigated to nd the application of the LSMH crystals in various optoelectronic devices. In our previous work, we study the effect of Eu 3+ and Tb 3+ ions on the structural, dielectric and optical properties of LSMH crystal and attempted to explore the possibility of using them as red and green light-emitting photoluminescent materials (Phosphors) [27].…”

Section: Introductionmentioning

confidence: 99%

“…As LSMH crystal has a wide optical band gap of 4.49 eV [27], hence such parameters should be investigated to nd the application of the LSMH crystals in various optoelectronic devices. In our previous work, we study the effect of Eu 3+ and Tb 3+ ions on the structural, dielectric and optical properties of LSMH crystal and attempted to explore the possibility of using them as red and green light-emitting photoluminescent materials (Phosphors) [27]. In the present work, we preceded further the previous work to study the effect of the rare-earth ions (Eu 3+ and Tb 3+ ) on the various optoelectrical parameters of LSMH crystals.…”

Section: Introductionmentioning

confidence: 99%

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Effect of rare-earth Eu3+ and Tb3+ ions on the optoelectrical parameters of lithium sulfate monohydrate crystals

et al. 2023

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The effect of rare-earth Eu 3+ and Tb 3+ ions on the optoelectrical parameters of lithium sulfate monohydrate (LSMH) crystals grown by slow evaporation solution growth technique was observed. The information extracted from transmittance and re ectance spectra proved helpful in determining refractive index, extinction coe cient and various other parameters for these crystals. The effect on the volume/surface energy loss functions, optical energy gap, band tail width and tangent loss factor due to doping in these crystals were discussed. The impact of rare-earth ions on dispersion parameters derived from Wemple-DiDomeenico single oscillator model, Cauchy dispersion relation and on optoelectrical parameters derived from Drude theory was also studied. The other different parameters like optical conductivity, electronic polarizability, nonlinear refractive index, optical electronegativity, nonlinear optical susceptibility, optical and chemical hardness also get affected by doping of rare-earth ions. The relation between group and phase velocity in terms of group index in these crystals was also discussed. However, some empirical and semi-empirical rules have been used to calculate the value of the refractive index.

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Section: Refractive Index and Extinction Coe Cientsupporting

confidence: 81%

Section: Methodsmentioning

confidence: 99%