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article
Thermochromism of highly luminescent photopolymer flexible films based on Eu (III) salts confined in polysulfone
Abstract
<p>Here we discuss the influence of two different cations on the emissive properties of the highly emissive [Eu(fod)<sub>4</sub>]<sup>−</sup> anion. The studied Eu(III) salts were [C<sub>16</sub>Pyr][Eu(fod)<sub>4</sub>] (1), and the previously reported [Chol][Eu(fod)<sub>4</sub>]. C<sub>16</sub>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<sup>◦</sup>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)<sub>4</sub>] in the polymeric matrix, which improved its thermal stability. Additionally, the luminescence of CholEu(fod)<sub>4</sub>/PSU presented a strong temperature dependence with a ratiometric thermal behavior.</p>