In this paper we describe the photoluminescence properties of tetra[4.4.4-trifluoro-1-(2-thienyl)-1.3-butane-diono] europium [4-methyl pyridine] chelate and the tetra [4.4.4-trifluoro-1-(2-thienyl)-1.3-butane-diono] europium [2.4.6-trimethyl pyridine] chelate. The absorption

excitation and fluorescence spectra and quantum efficiencies of the chelates in the solid state and the solution were measured at room temperature. The effect of the solven on the luminescence properties are studied.Their luminescence mechanism are discussed the basis of the molecular structure and the luminescence properties.