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

The optical spectroscopy and excited state dynamics of the 5D3 and 5D4 levels of Tb3+ and 5D0 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 5D0 level of Eu3+, peaking in the red spectral region at 612 nm. The energy transfer efficiency from the 5D4 level of Tb3+ 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.