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

Author(s)

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

• Document type: Journal article
• Source: Optical Materials; v. 138, p. 9-pg., 2023-03-21.

Abstract

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)

• FAPESP's process: 18/07727-7 - High-performance plastic fiber luminescent solar concentrators for flexible waveguiding photovoltaics (SolarFlex)
• Grantee: Sidney José Lima Ribeiro
• Support Opportunities: Regular Research Grants
• FAPESP's process: 15/22828-6 - Pushing the boundaries of optical fibers: from photonics to optogenetics and environmental monitoring
• Grantee: Younes Messaddeq
• Support Opportunities: Research Projects - SPEC Program
• FAPESP's process: 22/03652-8 - Preparation of PMMA optical fibers and thin films containing optically active centers for application in photonics as luminescent solar concentrators
• Grantee: Fábio José Caixeta
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 20/03259-9 - Development of a new kind of biodegradable polymer nanocomposes for application as coating in the slow and controlled release of soluble fertilizers
• Grantee: Ricardo Bortoletto Santos
• Support Opportunities: Scholarships in Brazil - Post-Doctoral