Tb3+ -> Ce3+ energy transfer in Y3-x-yTbyGdxAl5O12 (x=0.65, y=0.575) doped with Ce3+
Journal
Radiation Measurements
Journal Volume
42
Journal Issue
4-5
Pages
755-758
Date Issued
2007
Author(s)
Abstract
Photoluminescence and luminescence excitation spectra of Y2.3 - x Tbx Ce0.05 Gd0.65 Al5 O12 (x = 0.575) have been measured at room temperature. Depending on the excitation wavelength the broad band emission related to interconfigurational transitions in Ce3 + ions, or the sharp lines luminescence related to 5D4 → 7F6, 5D4 → 7F5, 5D4 → 7F4 and 5D4 → 7F3, transitions in Tb3 + ions have been observed. It has been found that efficiency of Tb3 + → Ce3 + energy transfer depends on the excitation energy, specifically it is less effective when Tb3 + is excited to the lowest state of the excited 5 d1 4 f7 electronic configuration. This effect has been tentatively attributed to the nonradiative de-excitation of Tb3 + ion to the metastable 5 D4 state. Configurational model has been developed, which explains the peculiarities of relaxation in the excited states of Tb3 + and Ce3 +, and Tb3 + → Ce3 + energy transfer. © 2007.
SDGs
Type
journal article