SAIP2016

Blue-yellow luminescence of Eu-doped CaSnO3 nanopowders synthesized by the sol-gel autocombustion process

5 Jul 2016, 16:10

1h 50m

Kramer Law building

Board: A.069

Poster Presentation Track A - Division for Physics of Condensed Matter and Materials Poster Session (1)

Speakers

Prof. F. Birhanu Dejene (UFS) Dr Moges Tsega Yihunie (University of the Free State (qwaqwa campus))

Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

Undoped and Eu-doped CaSnO3 nanopowders were prepared by a facile sol-gel autocombustion method calcined at 800 oC for 1h. The crystal structure of the nanopowders is identified by the X-ray diffreaction (XRD) technique, and it is found that all samples showed pure orthorhombic CaSnO3 structure. Photoluminsence measurements indicated that the undoped sample exhibits a broad blue emission at about 420440 nm, which can be attributed to the recombination of self-trapped excitons. Additional sharp emission lines at 465, 592 nm were obtained in the Eu-doped CaSnO3 sample and these emission lines were assigned to the f-f transition of 5D15D0, 5D07F1 in Eu3+ ions. The mixture of this blue and yellow luminescence gives white color in Eu-doped doped CaSnO3 sample under UV excitation.

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD, N/A)?

Posdc

Please indicate whether<br>this abstract may be<br>published online<br>(Yes / No)

No

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

Yes

Main supervisor (name and email)<br>and his / her institution

F.B. Dejene,DejeneBF@ufs.ac.za, UFS

Apply to be<br> considered for a student <br> &nbsp; award (Yes / No)?

No

Presentation Materials

notes

Supervisor agreement