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Article
Red/NIR/SWIR multi-band persistent luminescent nanoparticles as ultrasensitive multi-channel tracers in water and crude oil/water emulsions
We report the use of CaTiO3:Pr3+ multiband persistent luminescent nanoparticles, which can simultaneously emit red (610 nm), near-infrared (893 nm), and short-wave infrared (1040 nm) photoluminescence and persist...
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Article
Open AccessSynergistic strain engineering of perovskite single crystals for highly stable and sensitive X-ray detectors with low-bias imaging and monitoring
Although three-dimensional metal halide perovskite (ABX3) single crystals are promising next-generation materials for radiation detection, state-of-the-art perovskite X-ray detectors include methylammonium as A-s...
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Article
Open AccessAnalysis of the water use efficiency using super-efficiency data envelopment analysis
Data envelopment analysis (DEA) is a linear programming and production theory-based nonparametric approach that is generally used for efficiency analysis. Older DEA models, such CCR and BCC, can only identify ...
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Article
Open AccessSolar-blind ultraviolet-C persistent luminescence phosphors
Visible-light and infrared-light persistent phosphors are extensively studied and are being used as self-sustained glowing tags in darkness. In contrast, persistent phosphors for higher-energy, solar-blind ult...
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Article
Open AccessNew function of the Yb3+ ion as an efficient emitter of persistent luminescence in the short-wave infrared
The trivalent ytterbium (Yb3+) ion has been extensively used as an emitter in short-wave infrared (SWIR) lasers, a sensitizer to activate other lanthanide ions for up-conversion luminescence, and a spectral conve...
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Article
Open AccessUltra-sensitive in-situ detection of near-infrared persistent luminescent tracer nanoagents in crude oil-water mixtures
Current fluorescent nanoparticles-based tracer sensing techniques for oilfield applications suffer from insufficient sensitivity, with the tracer detection limit typically at the several hundred ppm level in u...
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Article
Open AccessNew localized/delocalized emitting state of Eu2+ in orange-emitting hexagonal EuAl2O4
Eu2+-activated phosphors are being widely used in illuminations and displays. Some of these phosphors feature an extremely broad and red-shifted Eu2+ emission band; however, convincing explanation of this phenome...
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Article
Open AccessElectronically transparent graphene replicas of diatoms: a new technique for the investigation of frustule morphology
The morphogenesis of the silica cell walls (called frustules) of unicellular algae known as diatoms is one of the most intriguing mysteries of the diatoms. To study frustule morphogenesis, optical, electron an...
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Article
Open AccessSelf-Assembly of Graphene on Carbon Nanotube Surfaces
The rolling up of a graphene sheet into a tube is a standard visualization tool for illustrating carbon nanotube (CNT) formation. However, the actual processes of rolling up graphene sheets into CNTs in labora...
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Article
Open AccessPhotostimulated near-infrared persistent luminescence as a new optical read-out from Cr3+-doped LiGa5O8
In conventional photostimulable storage phosphors, the optical information written by x-ray or ultraviolet irradiation is usually read out as a visible photostimulated luminescence (PSL) signal under the stimu...
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Article
Open AccessNew yellow Ba0.93Eu0.07Al2O4 phosphor for warm-white light-emitting diodes through single-emitting-center conversion
Phosphor-converted white light-emitting diodes for indoor illumination need to be warm-white (i.e., correlated color temperature <4000 K) with good color rendition (i.e., color rendering index >80). However, n...
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Article
Sunlight-activated long-persistent luminescence in the near-infrared from Cr3+-doped zinc gallogermanates
Visible-light persistent phosphors are being widely used as self-sustained night-vision materials because of their sufficiently strong and long afterglow (>10 h) and their ability to be excited by sunlight as ...
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Article
Photoluminescence spectra tuning of Eu2+ activated orthosilicate phosphors used for white light emitting diodes
Divalent europium activated alkaline earth orthosilicate M2SiO4 (M = Ba, Sr, Ca) phosphors were synthesized through solid-state reaction technique and their luminescent properties were investigated. Photoluminesc...
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Article
Li2SrSiO4:Eu2+ phosphor prepared by the Pechini method and its application in white light emitting diode
Eu2+-doped Li2SrSiO4 phosphors were prepared by two different synthesis processes, the Pechini sol-gel route and solid-state reaction (SSR) method. Their morphology, crystal structure, and luminescence properties...
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Article
A Dual-RF-Plasma Approach for Controlling the Graphitic Order and Diameters of Vertically-Aligned Multiwall Carbon Nanotubes
Plasma enhanced chemical vapor deposition (PECVD) is a unique technique for growing vertically-aligned multiwall carbon nanotubes (VA-MWNTs) at controllable tube densities. This technique is of considerable im...
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Article
Preparation of very long and open aligned carbon nanotubes
Very long and open aligned carbon nanotubes that reach about 2 mm long, an order of magnitude longer than previously reached, have been prepared by chemical vapor deposition over silica dioxide substrates on t...
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Article
Laser synthesis and crystallization of nanocomposite Si/C/N powder
Ultrafine preceramic Si/C/N composite powders have been prepared from hexamethyldisilazane (HMDS) by laser-induced gas phase reaction, using a new kind of tworeaction-zone reactor which could efficiently incre...
