Abstracts 2007

Abstract of Publication No. 575

M. D. Birowosuto, P. Dorenbos, C. W. E. van Eijk, K. W. Krämer and H. U. Güdel
Thermal quenching of Ce3+ emission in PrX3 (X = Cl, Br) by intervalence charge transfer
J. Phys.: Condens. Matter 19, 256209/1-16 (2007)      Full Text (PDF)      DOI-Link     

Abstract: The cause of the relatively low scintillation light yield of PrBr3:Ce3+ is investigated by means of optical spectroscopy, the temperature dependence of scintillation properties and the temperature dependence of optically excited decay curves of undoped and Ce3+-doped PrCl3 and PrBr3. The integrated intensity of x-ray excited luminescence of PrBr3:5Ce3+ shows that the light yield at room temperature (RT) is two times less than at 80 K. The decay time of Ce3+ emission optically excited to its 5d band in PrBr3:5Ce3+ has a single exponential decay of 11.0 1.1 and 6.0 0.6 ns at 10 K and RT, respectively. It is proposed that Ce3+ emission is quenched by a metal-to-metal charge transfer of Ce3+ + Pr3+  Ce4+ + Pr2+ followed by 4f  4f emission of Pr3+ which is strongly concentration quenched.

Last modified: 13.12.11 by Gabriela Frei