University of Khartoum

Conversion of Y3(Al,Ga)5O12:Tb3+ to Y2Si2O7:Tb3+ thin film by annealing at higher temperatures

Conversion of Y3(Al,Ga)5O12:Tb3+ to Y2Si2O7:Tb3+ thin film by annealing at higher temperatures

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dc.contributor.author Mohammed, A. Yousif
dc.date 2013
dc.date.accessioned 2016-02-25T05:52:49Z
dc.date.available 2016-02-25T05:52:49Z
dc.date.issued 2016-02-25
dc.date.submitted 2016
dc.identifier.uri http://khartoumspace.uofk.edu/handle/123456789/19415
dc.description.abstract Y3(Al,Ga)5O12:Tb thin films were grown on Si(1 0 0) substrates in an Ar working atmosphere by using the pulsed laser deposition (PLD) technique. The Y3(Al,Ga)5O12:Tb target was ablation deposited onto a Si(1 0 0) substrate using a 266 nm Nd:YAG laser. The influence of post deposition annealing temperature (1073 K to 1473 K) on the excitation and the emission bands, and the crystal structure of the thin film were monitored. X-ray diffraction (XRD) and photoelectron spectroscopy (XPS) depth profiles of the thin films indicate that there were annealing induced changes in the crystal structure and chemical composition causing changes in the excitation bands. These changes (structure and composition) are attributed to interdiffusion of atomic species between the substrate and the Y3(Al,Ga)5O12:Tb3+ thin film. The XRD and XPS data confirm that after annealing, Y3(Al,Ga)5O12:Tb3+ was converted to Y2Si2O7:Tb3+. A change in the relative ratios of the excitation band intensities was measured. Atomic force microscopy (AFM) showed that topographical changes also occurred during the annealing process. Thermoluminescence (TL) glow curves of the Y3(Al,Ga)5O12:Tb3+ thin films before and after annealing, indicated the presence of different types of traps resulting from the change on the structure of the thin films en_US
dc.publisher uofk en_US
dc.subject PLD Y3(Al,Ga)5O12:Tb Y2Si2O7:Tb Thin films Defect trap levels Photoluminescence (PL) XPS en_US
dc.title Conversion of Y3(Al,Ga)5O12:Tb3+ to Y2Si2O7:Tb3+ thin film by annealing at higher temperatures en_US
dc.type Publication en_US
dc.Faculty Science en_US

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