Photoluminescent Polymer Aerogels with R, G and B Emission

Abstract

In this work, three new polymer aerogels based on 2-hydroxy ethyl methacrylate (HEMA) complexes with Eu(III), Tb(III) and La(III) are prepared and investigated. The polymer aerogels present strong photoluminescence with emissions located in the red, green and blue regions of the visible spectrum. Depending on the water content used during the preparation path, the consistency of the photoluminescent aerogels varies from rigid, regularly shaped monoliths to a flexible, fibrous material with very low density. The morpho-structural investigation was performed by FT-IR, XPS and SEM. Thermal behavior was also evaluated, while steady-state fluorescence spectroscopy, absolute PLQY and lifetime were used for the investigation of their luminescent properties. The impressive photoluminescent emission located in the red, green and blue areas of the visible spectrum is preserved irrespective of the selected porosity. Their photo-emissive properties, tunable porosity and the convenience of the preparation path could be some arguments for applications as photonic conversion mediums in special-purpose optoelectronic devices or sensors.

Cellulose-Based Metallogels—Part 2: Physico-Chemical Properties and Biological Stability

“…Gels are described as spatially structured semi-solid 3D polymer networks that are expanded throughout the whole volume by a gas or a fluid. Aerogels are formed after the fluid is removed and substituted by air [ 1 ], while hydrogels are filled with liquid as the medium [ 2 , 3 , 4 , 5 , 6 ]. Thus, a gel can be seen as a large amount of solvent immobilized by a small amount of crosslinked solid [ 3 ].…”

Polyimide aerogel/aramid fiber composite with high mechanical strength and thermal insulation for thermal protective clothing

“…Aerogel is a kind of three-dimensional nano-porous material with ultra-high porosity (Ze et al, 2018a). A large number of nano-sized pores in aerogel gives it the characteristics of low density, low refractive index, small aperture, high specific surface area, and high porosity, which makes aerogel have good light transmission, environmental protection, sound insulation, and other properties (Lee et al, 2011;Ivanov and Ivanov, 2014;Du and Kim, 2022;Stan et al, 2022). Due to the porosity of up to 90%, the aerogel material mainly conducts heat in the gaseous phase, which possesses high thermal insulation and high surface area.…”