The emission spectrum of neat Sr3Tb(PO4)(3) upon excitation at 337 nm in the levels above D-5(3) is dominated by D-5(4) emission and no significant emission from D-5(3) is observed due to efficient cross relaxation involving the Tb3+ levels. On the other hand, the emission spectrum of the same host containing 10 mol% Eu3+ upon excitation at the same wavelength (in the Tb3+ levels) is dominated by strong emission bands from the D-5(0) level of Eu3+. This clearly indicates that Tb3+ -> Eu3+ energy transfer is present. The excitation spectrum of the Eu3+ D-5(0) emission is dominated by Tb3+ bands extending in the UV region.
Excited state dynamics and energy transfer rates in Sr3Tb0.90Eu0.10(PO4)(3)
BETTINELLI, Marco Giovanni;PICCINELLI, FABIO;SPEGHINI, Adolfo;
2012-01-01
Abstract
The emission spectrum of neat Sr3Tb(PO4)(3) upon excitation at 337 nm in the levels above D-5(3) is dominated by D-5(4) emission and no significant emission from D-5(3) is observed due to efficient cross relaxation involving the Tb3+ levels. On the other hand, the emission spectrum of the same host containing 10 mol% Eu3+ upon excitation at the same wavelength (in the Tb3+ levels) is dominated by strong emission bands from the D-5(0) level of Eu3+. This clearly indicates that Tb3+ -> Eu3+ energy transfer is present. The excitation spectrum of the Eu3+ D-5(0) emission is dominated by Tb3+ bands extending in the UV region.
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