Bluish-green afterglow and blue photoluminescence of undoped BaAlO.

Undoped BaAlO was derived sol-gel combustion technique. The afterglow and photoluminescence (PL) properties of undoped BaAlO were explored with the combination of experiments and density functional theory (DFT) calculations. Undoped BaAlO is found to display bluish-green afterglow that is discernible to naked eye in dark for about 20 s.

Diffusing Mn into Dy Doped SrAlO for Full-Color Tunable Emissions.

Dy and Mn codoped SrAlO (SrAlO:Dy,Mn) phosphors were obtained by diffusing Mn ions into Dy-doped SrAlO via the constant-source diffusion technique. The influences of diffusion temperature and diffusion time on the emissions of SrAlO:Dy,Mn were investigated. It was found that: (i) efficient red emission peaking at 651 nm can be readily achieved for SrAlO:Dy by simply diffusing Mn into SrAlO:Dy at 800 °C and above; (ii) the red emission of Mn becomes dominant over the characteristic emissions of Dy when the diffusion temperature is 900 °C or higher; and (iii) the intensity of the red emission of SrAlO:Dy,Mn is far more sensitive to diffusion temperature than to diffusion time.

Photoluminescence and afterglow of Dy doped CaAlO derived sol-gel combustion.

With doping concentration varying from 0.1 to 5.0 mol%, a series of Dy doped calcium aluminate (CaAlO:Dy) phosphors were synthesized a sol-gel combustion technique.

Green Afterglow of Undoped SrAlO.

Undoped SrAlO nanocrystals were obtained via solution combustion using urea as fuel. The afterglow properties of undoped SrAlO were investigated. Green afterglow from undoped SrAlO is visible to the human eye when the 325 nm irradiation of a helium-cadmium laser (13 mW) is ceased.

Blue Photoluminescence and Cyan-Colored Afterglow of Undoped SrSO Nanoplates.

Undoped SrSO nanoplates were synthesized the composite hydroxide-mediated approach. The products were characterized by means of X-ray diffractometry, scanning electron microscopy, X-ray energy-dispersive spectroscopy, X-ray photoelectron spectroscopy, photoluminescence (PL) spectroscopy, electron spin resonance technique, afterglow spectroscopy, and thermoluminescence dosimetry. The steady-state PL spectrum of undoped SrSO nanoplates can be deconvoluted into two distinct Gaussian bands centered at 2.

Intrinsic Defect Engineering in Eu Doped ZnWO₄ for Annealing Temperature Tunable Photoluminescence.

Eu doped ZnWO₄ phosphors were synthesized via the co-precipitation technique followed by subsequent thermal annealing in the range of 400⁻1000 °C. The phase, morphology, elemental composition, chemical states, optical absorption, and photoluminescence (PL) of the phosphors were characterized by X-ray diffraction, scanning electron microscopy, dispersive X-ray spectroscopy, X-ray photoelectron spectrometry, diffuse UV⁻vis reflectance spectroscopy, PL spectrophotometry, and PL lifetime spectroscopy, respectively. It is found that the PL from Eu doped ZnWO₄ is tunable through the control of the annealing temperature.

Eu and Eu Doubly Doped ZnWO₄ Nanoplates with Superior Photocatalytic Performance for Dye Degradation.

Eu and Eu doubly doped ZnWO₄ nanoplates with highly exposed {100} facets were synthesized via a facile hydrothermal route in the presence of surfactant cetyltrimethyl ammonium bromide. These ZnWO₄ nanoplates were characterized using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectrometry, diffuse UV-vis reflectance spectroscopy, photoluminescence spectrophotometry, and photoluminescence lifetime spectroscopy to determine their morphological, structural, chemical, and optical characteristics. It is found that Eu-doped ZnWO₄ nanoplates exhibit superior photo-oxidative capability to completely mineralize the methyl orange into CO₂ and H₂O, whereas undoped ZnWO₄ nanoparticles can only cleave the organic molecules into fragments.

Effect of enterohaemorrhagic Escherichia coli O157:H7-specific enterohaemolysin on interleukin-1β production differs between human and mouse macrophages due to the different sensitivity of NLRP3 activation.

Enterohaemorrhagic Escherichia coli (EHEC) O157:H7 infection in humans can cause acute haemorrhagic colitis and severe haemolytic uraemic syndrome. The role of enterohaemolysin (Ehx) in the pathogenesis of O157:H7-mediated disease in humans remains undefined. Recent studies have revealed the importance of the inflammatory response in O157:H7 pathogenesis in humans.

[Excitation-wavelength dependent photoluminescence from porous silicon].

With the technique of fluorescence spectral analysis, the dependence of the fluorescence from porous silicon on the excitation wavelength was investigated. It was found when the excitation wavelength decreases from 650 to 340 nm, the fluorescence spectrum of porous silicon blue shifts continuously from 780 to 490 nm. Using scanning electron microscopy (SEM) and computer simulation, the cross-sectional structures of porous silicon were studied.