Solid-state lighting (SSL) and field emission based display (FED) devices collectively encompass a major fraction of contemporary research efforts and thus development of a newer generation of highly luminescent nanophosphors presently defines a critical juncture for further development of this still somewhat-nascent field. However, the low efficiency of red phosphors constitutes a principal bottleneck for commercialization of such devices. Herein, we present a red light emitting highly luminescent Na + codoped CaSnO 3 :Eu 3+ nanophosphor with an average particle size of 32 nm that has been synthesized by a modified sol−gel technique. The resultant nanophosphor exhibits bright red emission under both UV and low voltage electron beam excitations. Furthermore, quantitative assessments of photoluminescence (PL) signatures for Eu 3+ doped and Na + codoped CaSnO 3 :Eu 3+ nanophosphors conclusively demonstrate that Na + codoping facilitates an almost 4-fold increase in the luminescence intensity coupled with significant improvement in thermal stability. In addition, charge compensation by incorporation of Na + leads to an increased order of radiative transition and thereby increases the color purity and lifetime of radiative transition. Obtained results firmly and unambiguously establish the bright and revolutionary prospects of this new type of nanophosphor in the rapidly emerging field of solid state lighting and FED devices.
The reduction of the carbon black quantity in elastomeric composites is a massive requirement from environmental perspective and a huge challenge for industrial implementation. The present work consists of the replacement of half amount of carbon black with silica without compromising the basic properties along with ushering of superior characteristics of fluoroelastomer and silicone rubber blends. The comparative study of carbon black-silica hybrid filler (1:1 ratio) with carbon black and silica at different loadings shows much superior aging behavior and thermal stability compared with the other composites with unforeseen increment of tensile strength (56%). The fundamentals of rubber-filler interaction and reinforcement phenomenon of the hybrid filler composites have been determined by the correlation of the experimental findings with different models like Nicolais-Narkis, Nielsen, Guth, and Kerner model. Furthermore, enhanced compatibility between the two rubber phases has been observed in terms of T g shifting (3.8 C) and reduced FKM domain size (from 450 to 300 nm) in the silicone rubber matrix for hybrid filler composites. Morphological studies reflect the selected homogeneous dispersion of the carbon black in fluoroelastomer domain and silica in silicone rubber phase. These super specialty elastomeric composites can be used as oil and fuel resistant gaskets and O-rings for wide temperature range.
In this contribution, hydrophobic association and metal‐ligand coordination have been employed in a dual physical crosslinking strategy to access hydrogels based on micellar copolymerization of acrylamide and a hydrophobic acrylic monomer (containing terpyridine (terpy) for metal‐ligand interaction). The mechanical properties of these hydrogels are strongly influenced by the thermodynamic stability and kinetic lability of the metal‐terpy crosslinks present in these materials. While the hydrogel tensile strength and stability on water exposure are enhanced by choosing stronger Fe2+‐terpy crosslinks, the weaker and more kinetically labile Zn2+‐terpy coordination bonds enable significantly higher energy dissipation under tensile loading and self‐healing in the resultant hydrogels.
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