Recently, more and more room temperature phosphorescent (RTP) phenomena have been observed in the crystals and organic aggregates, which indicate the dependence of RTP luminescence properties on the molecular packing...
Multicolour and white-emitting oligourethane gels have been prepared; their supramolecular assembly and proof-of-concept photonic applications are reported.
As known, actinyl peroxides play important roles in environmental transport of actinides, and they have strategic importance in the application of nuclear industry. Compared to the most studied uranyl peroxides, the studies of transuranic counterparts are still few, and more information about these species is needed. In this work, experimentally inspired actinyl peroxide dimers ([An 2 O 6 ] 2+ , An = U, Np, and Pu) have been studied and analyzed by using density functional theory and multireference wave function methods. This study determines that the three [An 2 O 6 ] 2+ have unique electronic structures and oxidation states, as 2+ . This study demonstrates the significance of two bridging oxo ligands with at most four electron holes availability in ionically directing actinyl and resulting in the unusual multiradical bonding in [(Pu VI/V O 2 ) 2 (O 2 ) 1− ] 2+ . In addition, thermodynamically stable 12-crown-4 ether (12C4) chelated [(An 2 O 6 )(12C4) 2 ] 2+ complexes have been predicted, that could maintain these unique electronic structures of [An 2 O 6 ] 2+ , where the An ← O 12C4 dative bonding shows a trend in binding capacity of 12C4 from κ 4 (U) to κ 3 (Np) and κ 4 (Pu). This study reveals the interesting electronic character and bonding feature of a series of early actinide elements in peroxide complexes, which can provide insights into the intrinsic stability of An-containing species.
Conventional antireflection coatings (ARCs), including single- and multi-layer, bionic micro/nano, and gradient-index structures, often do not take anomalous dispersive materials into account, but normal dispersion and Rayleigh configuration, known as a step-down index profile, in which low refractive index (RI) materials are adjacent to incident media and the high RI ones, are located on substrates. We found that the anomalous dispersive materials could be good candidates for novel sub-100 nm ARCs, considering the ab-initio impedance matching designs. Engineering the anomalous dispersion of co-sputtering Ag-AZO hybrid materials, two types of ARCs were fabricated on silicon substrates: a 70 nm tri-layer reverse-Rayleigh and a 140 nm bi-layer Rayleigh for comparison. We observed that both exhibited the average reflectance of 5.46% and 1.49% at the wavelength range from 400 to 780 nm, respectively, and were much lower than that of bare silicon, 38.02%, where the underlying origin for the reverse-Rayleigh AR was discussed. The studies on the engineering and integration of anomalous dispersive materials into ARCs and optical elements would be of great significance for compact light harvesting, energy conversion, and radar stealth technology.
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