A series of highly quantum efficiency PMMA luminescent films doped with Eu-complex as promising light-conversion molecular devices
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In this paper, a series of Eu/PMMA and Eu/PMMA/SiO2 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 5D0/7FJ. The fact that the quantum efficiencies (η) of the doped film increased significantly indicated that PMMA matrix acted as an efficient co-sensitizer for Eu3+ ions luminescent center, and therefore enhanced the η of the emitter 5D0 level. Especially, with the doping nano-SiO2 into Eu/PMMA-5 % system, the T d-5 % of Eu/PMMA/SiO2 has obviously improved. Due to the carrying effect of nano-SiO2 and interaction between –C=O of PMMA chain and Eu3+ ions, the η of Eu/PMMA/SiO2 films have been greatly enhanced. To the best of our knowledge, the η of Eu/PMMA/SiO2-3 % film (78.57 %) is found to be the highest so far reported in the literature. These Eu/PMMA/SiO2 luminescent films show excellent luminescent properties and therefore have potential applications in light-conversion molecular device.
KeywordsPMMA Composite Film High Quantum Efficiency Pure PMMA Ancillary Ligand
This work is financially supported by the National Natural Science Foundation of China (No. 21404017), and the Chongqing Science and Technology Innovation Capacity Building Project (Project No. cstc2013kjrc-qnrc50003).
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