Journal of New Technology and Materials
Volume 2, Numéro 1, Pages 34-37
2012-06-25

Structural And Optical Properties Of Cdse Doped Kcl Single Crystal



Authors : Bouhdjer L. . Addala S. . Chala A.b. . Halimi O. . Boudine B. . Sebais M. . Kara S. .

Abstract

Undoped and doped KCl single crystals by CdSe nanocrystals (NCs) have been grown by Czochralski (CZ) method with pulling rates in the 8-10 mm/h range. The crystals thus obtained were cleaved into samples of required size. The structural investigation of these samples has been deduced from Ө-2Ө (XRD) and Raman spectroscopy. The nano-size of CdSe aggregates in KCl host determined from XRD measurements by using the Sheerer formula. The Raman spectroscopy presented the LO mode vibration relative of (Cd-Se) chemical liaison. Moreover, the results of the optical absorption and photoluminescence spectra confirmed the nano-size of CdSe aggregates were observed band absorption located at 622,5nm relative of electronic transition 1se-1s3/2 of CdSe, with a blue shift from the bulk gap of ΔEg=0,26eV (Eg (CdSe) bulk=1,73eV), while the photoluminescence showed a band situated at 643, 55 nm, with displacement Eg towards the short wavelength (blue shift), this bleu shift due to the nanometric size of CdSe aggregates.

Keywords

nanocrystals, KCl single crystal, Cz method, XRD, Raman spectrometer, UV-Vis absorption, photoluminescence

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