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Here we discuss the influence of two different cations on the emissive properties of the highly emissive [Eu(fod) 4 ] - anion. The studied Eu(III) salts were [C 16 Pyr][Eu(fod) 4 ] ( 1 ), and the previously reported [Chol][Eu(fod) 4 ]. C 16 Pyr stands for N-cetylpyridinium, Chol for cholinium and fod for 1,1,1,2,2,3,3-heptafluoro-7,7-dimethyloctane-4,6-dionate. 1 is classified as ionic liquid, with melting point close to 60 °C, and presented a luminescence quantum yield of (ϕ) 100%. Ultrabright emissive photopolymers were obtained for the first time using polysulfone as the host matrix. The films were prepared with incorporation of 10% ( w / w ) of 1 and [Chol][Eu(fod) 4 ] in the polymeric matrix, which improved its thermal stability. Additionally, the luminescence of CholEu(fod) 4 /PSU presented a strong temperature dependence with a ratiometric thermal behavior.

Thermochromism of Highly Luminescent Photopolymer Flexible Films Based On Eu (III) Salts Confined in Polysulfone