12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone

The influence of Pr3+ co-doping on the photoluminescence and cathodoluminescence properties of SiO2:Eu3+ /Tb3+.

13 Jul 2011, 17:00


Poster Presentation Track A - Condensed Matter Physics and Material Science Poster1


Ms Gugu Mhlongo (CSIR/UFS)


Pr3+-Tb3+, and Pr3+-Eu3+ ion pairs co-doped in SiO2 matrix were prepared by a sol-gel method. The photoluminescence (PL) measurements revealed the red and green emissions centred at 614 nm (5D0-7F2) and 541 nm (5D4→7F5) for single doped Eu3+ and Tb3+ ions in SiO2, respectively. Co-doping of Eu3+ and Tb3+ ions with Pr3+ in SiO2 showed that the energy transfer between Pr3+ and nearest Eu3+ and Tb3+ ions takes place. At the same time, however, there was evidence of luminescence quenching of Eu3+ and Tb3+ emissions at certain concentrations of Pr3+. The quenching was also confirmed by cathodoluminescence (CL) measurements recorded from the same powders. . Possible mechanism of energy transfer from Pr3+ to Eu3+ and Tb3+ and its quenching effects are discussed.

Consider for a student <br> &nbsp; award (Yes / No)? NO
Level (Hons, MSc, <br> &nbsp; PhD, other)? PhD
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)? YES

Primary authors

Ms Gugu Mhlongo (CSIR/UFS) Prof. Hendrik Swart (UFS) Dr Piotr Solarz (Polish Academy of Sciences)


Presentation Materials