In this paper, a series of Eu/PMMA and Eu/ PMMA/SiO 2 luminescent films have been designed, fabricated and characterized. Thermo-gravimetric analysis and photo-luminescence results indicated the Eu-complex precursor was successfully immobilized in PMMA matrix through the interaction between the Eu-complex and the -C=O groups of the PMMA matrix. The emission spectra of the Eu-complex and Eu/PMMA films recorded at 25°C exhibited the characteristic bands arising from the 5 D 0 / 7 F J . The fact that the quantum efficiencies (g) of the doped film increased significantly indicated that PMMA matrix acted as an efficient co-sensitizer for Eu 3? ions luminescent center, and therefore enhanced the g of the emitter 5 D 0 level. Especially, with the doping nano-SiO 2 into Eu/ PMMA-5 % system, the T d -5 % of Eu/PMMA/SiO 2 has obviously improved. Due to the carrying effect of nanoSiO 2 and interaction between -C=O of PMMA chain and Eu 3? ions, the g of Eu/PMMA/SiO 2 films have been greatly enhanced. To the best of our knowledge, the g of Eu/PMMA/SiO 2 -3 % film (78.57 %) is found to be the highest so far reported in the literature. These Eu/PMMA/ SiO 2 luminescent films show excellent luminescent properties and therefore have potential applications in lightconversion molecular device.

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