Luminescent PVDF nanocomposite films and fibers encapsulated with La2Hf2O7:Eu3+ nanoparticles

Abstract

Luminescent films and fibers are in high demand in display devices and optoelectronics owing to their higher flexibility and mechanical strength compared to powder samples. Keeping that in mind, we have encapsulated La 2 Hf 2 O 7 :Eu 3+ (LHOE) nanoparticles (NPs) synthesized by a molten salt method into polyvinylidene fluoride (PVDF) films and fibers. The LHOE-PVDF nanocomposite fibers were manufactured using a Forcespinning® technology while the counterpart films were fabricated by a drop-casting technique. Their photophysical properties were analyzed and compared. Specifically, the red emission with optimum lifetime, color coordinates, and branching ratio of the LHOE NPs can be reproduced even when incorporated inside the PVDF films and fibers. Our studies demonstrate that the LHOE-PVDF films have better emission output, excited-state lifetime, quantum yield, and color purity than the fibers. This is attributed to lower defect density and better surface texture of the LHOE-PVDF films compared to the fibers. Based on the Judd-Ofelt analysis, we have also elucidated that the Eu-O bond is more polarizable and has a higher degree of covalency in the LHOE-PVDF films compared to that in the fibers. The trend of the Judd-Ofelt parameters suggested that Eu 3+ has a more asymmetric environment in the films compared to the fibers which impart higher red color purity to the former.

Tunable CsPb(Br/Cl)3perovskite nanocrystals and further advancement in designing light emitting fiber membranes

“…[40,41] Additionally, higher production rates and the ease of processing [42], have prompted attention to this technology to develop fiber membrane systems for a wide variety of applications for example antibacterial gauze, [43] tissue engineering, [44] air filtration, [45] optical sensors, [46] lithium ion battery, [47] photo luminescence, etc. [48] In this study we have synthesized blue and green photoluminescent CsPb(Br/Cl) 3 perovskite NCs and have used these to develop fine fiber membranes from CsPb(Br/Cl) 3 /polymer solutions by using the centrifugal spinning method. We used poly (methyl methacrylate) (PMMA) as the polymer matrix.…”

Miniaturized Biosensors Based on Lanthanide-Doped Upconversion Polymeric Nanofibers

“…This includes protection from the destructive influence of molecular oxygen [ 48 ], protection from water quenching exhibiting a 50-fold increase in luminescence intensity [ 49 ], and negation of any problem with colloidal stability as the UCNPs are distributed wherever nanofibers are placed. Yet, doping nanofibers with UCNPs changes the nanofiber fabrication conditions [ 50 ], which need to be thoroughly investigated and possible light scattering of the fibrous mats must be considered for bioimaging and quantitative analyses [ 51 ].…”

Surfactants for Electrophoretic Deposition of Polyvinylidene Fluoride–Silica Composites

“…This polymer exhibits ferroelectric and piezoelectric properties, mechanical strength and low flammability [28][29][30][31]. Many PVDF applications involved the use of thin films and coatings [32][33][34]. Thin films were used for piezoelectric actuators and transducers, pyroelectric sensors, electrical insulators and capacitors [28,35,36].…”