Green host urethanesil based on castor oil doped with Eu3+complex

Autor(es)

de Freitas, Beatriz Damasio ; Domingos Onishi, Bruno Seiki ; Caixeta, Fabio Jose ; Bortoletto-Santos, Ricardo ; Rivas Garcia, Francis Dayan ; Messaddeq, Younes ; Lima Ribeiro, Sidney Jose

• Tipo de documento: Artigo Científico
• Fonte: Optical Materials; v. 138, p. 9-pg., 2023-03-21.

Resumo

Polymers based on vegetable oils can be suitable candidates for the replacement of fossil polymers, for instance, polyurethanes (PU) based on castor oil. However, the synthesis PU materials are normally carried out using organic solvents, metals, and high temperatures. To overcome these problems, the sol-gel route is an alternative approach based on mild conditions to produce organic-inorganic hybrid urethanesil (Ut) environmentally friendly. Therefore, in this study, we proposed an organic-inorganic hybrid (OIH) synthesis based on castor oil (CO)-derived Ut, as well as the incorporation and interaction of europium beta-diketone [Eu(tta)3(H2O)2] in organic-inorganic hybrid matrix. The Ut self-supporting hybrid was synthesized from the reaction of 3-(trie-thoxysilyl)propyl isocyanate (ICPTES) and CO in a 3:1 M ratio. The films were obtained using the sol-gel process, following the casting method. The CO-based OIH-Ut films showed high transmittance in the visible and infrared spectrum (90%), and urethanesil showed photoluminescence (PL) with emission at 416.0 nm when excited at 319.0 nm. The results also revealed an increase in the intrinsic quantum yield of PL (QEuL) for [Eu(tta)3(H2O)2]. It has been verified a QEuL value of 27% for the isolated complex, whereas when it is incorporated into OIH-Ut a value of 49% was observed. (AU)

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