Eco-friendly polydimethylsiloxane-based self-supporting film containing europium-polyoxometalate: A flexible luminescent material for white light generation

Abstract

Lanthanide (Ln 3+)-doped suitable matrices exhibit unique luminescent properties which are important for applications in optoelectronic devices. Most of the Ln 3+-based luminescent materials are, however, prepared in powder form using suitable robust inorganic host matrices. These matrices, often, experience lack of flexibility which is important for many applications such as LEDs and wearable devices, among others. To address this aspect, we report the preparation of flexible and highly transparent luminescent membranes based on polydimethylsiloxane-hydroxyurethanes (PDMSUr) as the hybrid framework and Europium-polyoxometalate (Eu (PW 11) 2) complex as the luminescent component. The PDMSUr, besides acting as green, transparent and flexible matrix, is found to increase the emission decay lifetime (from 1.5 ms to 3.0 ms) when Eu(PW 11) 2 is incorporated in the hybrid matrix. Moreover, upon UV excitation, the matrix exhibits a broader emission around 450 nm which, together with the characteristic emission of Eu 3+ ions, leads to the generation of white light.

PDMS-urethanesil hybrid multifunctional materials: combining CO2 use and sol–gel processing

“…One of such compounds is poly(dimethylsiloxane) (PDMS), which is classified as a silicone and can be used to build different types of devices including implants, microfluidic devices, microchips, water repellents, membrane for gas permeability, lithography, antifouling coating for marine environment and many others [20][21][22][23]. Over the past years, our research network worked on the synthesis of hybrid NIPUs from PDMS-based bis(cyclocarbonate) with (3aminopropyl)triethoxysilane (APTES) as chain coupling agent [24] leading to the formation of different materials with potential applications as protective and antimicrobial coatings [25] or photonics [26].…”

Materiais híbridos obtidos via fixação de CO>sub<2>/sub< com potencial para serem empregados como biomateriais: obtenção de compósitos de poli(hidroxiuretana)s derivadas de polidimetilsiloxano com fosfato de

“…Esta matriz de PDMSUr foi empregada em estudos para obtenção de compósitos utilizando diferentes tipos de nanopartículas como carga (SiO2, TiO2, Ag, ZnO e Polioxometalatos), resultando em materiais com muitas potenciais aplicações. Dentre elas, pode-se mencionar a fotônica (SIMÕES et al, 2018), dispositivos eletrônicos (ALVES, 2018), e o especial enfoque dado desenvolvimento de biomateriais candidatos a: recobrimento anticorrosivo de biomateriais metálicos; recobrimento antimicrobiano de implantes; recobrimento de dispositivos metálicos ortodônticos; adesivos biomiméticos para aplicação de implantes médicos e odontológicos (AGUIAR, 2015;FERMINO, 2018;HOLANDA, 2018).…”