Energy transfer processes in Sr3Tb0.90Eu0.10(PO4)3

The optical spectroscopy and excited state dynamics of the D-5(3) and D-5(4) levels of Tb3+ and D-5(0) level of Eu3+ have been studied in double phosphate materials having the eulytite disordered cubic structure. In the case of Sr3Tb0.90Eu0.10(PO4)(3), Tb3+ -> Eu3+ energy transfer is observed upon excitation in the Tb3+ energy levels located in the UV region. This transfer gives rise to strong emission from the D-5(0) level of Eu3+, peaking in the red spectral region at 612 nm. The energy transfer efficiency from the D-5(0) level of Tb-3+ in Sr3Tb0.90Eu0.10(PO4)(3) has been evaluated and the luminescence quantum yields of Sr3Tb(PO4)(3) and Sr3Tb0.90Eu0.10(PO4)(3) have been measured. (C) 2010 Elsevier B.V. All rights reserved.