First Investigation of Optical Properties and Local Structure of Gd3+ Doped Nano-Crystalline GeSe2

H. Hantour
2016 American Journal of Optics and Photonics  
Pure and Gd-doped nano-crystalline GeSe 2 were prepared by the melt-quenching technique. The crystal structure, local structure and emission properties are investigated. Structure analysis using Rietveld program suggests monoclinic structure for both virgin and doped samples with nano-particle size 41nm for GeSe 2 and 48nm for Gd-doped sample. A wide optical band gap as estimated from absorbance measurements is 4.1ev and 4.8ev for pure and doped samples in accordance with the confinement
more » ... confinement effects. Raman spectra show two unresolved components at ~ 202 cm -1 with broad line width. Also, well identified low intensity (ʋ < 145 cm -1 ) and high intensity (ʋ > 250 cm -1 ) bands are detected. For Gd-doped sample, the main band is shifted to lower energies and its FWHM is reduced by ~ 50% accompanied by an intensity increase of about ~ 17 fold times. The photoluminescence analysis of the pure sample shows a main emission band at ~ 604 nm. This band is splitted into two separated bands with higher intensity. The detected emission bands at wavelength > 650 nm are assigned to transmission from 6 G J to the different 6 P J terms.
doi:10.11648/j.ajop.20160405.11 fatcat:qudtuuopkjaoxeuif2w7j623me