نتایج جستجو برای: luminescence properties
تعداد نتایج: 878666 فیلتر نتایج به سال:
The luminescence spectrum of laurdan in glycerol consists of two bands with maxima at 425 and 500 nm. The strong dependence of this spectrum on the energy of the excitation quanta is demonstrated. When, excited on the red-edge slope of the absorption band, it is investigated at various temperatures. The biggest red shift (about 10 nm) of λmax is found for the long wavelength band at low tempera...
Studies of luminescence in growing cultures of Photobacterium fischeri revealed the characteristic kinetics of light emission, including a minimal phase of bacterial light output. A dialyzable substance present in the nutrient broth medium caused this transient inhibition in light production, although this substance did not affect culture growth. Experiments were carried out to determine the me...
With the rise of sustainable development, rehabilitation of brownfield sites located in urban areas has become a major concern. Management of contaminated soils in relation with environmental and sanitary risk concerns is therefore a strong aim needing the development of both useful tools for risk assessment and sustainable remediation techniques. For soils polluted by metals and metalloids (MT...
The new trans-[Pt(4-mpy)2Cl4] (1) complex (4-mpy is 4-methylpyridine) was prepared from the reaction of H2PtCl6.6H2O with 4-methylpyridine in methanol. Synthesized complex was thoroughly characterized by elemental analysis, IR and 1H-NMR spectroscopy.Elemental analysis data (C, H, N) support the general composition of the title complex and the structure have been established by single-crystal X...
The photo-physical properties of Eu-SWCNTs indicate that intrinsic excitonic properties of SWCNTs sensitize the lanthanoid element europium (Eu) to emit time-resolved red luminescence.
ZnS : Cu phosphors were prepared by using laboratory grade chemicals through coprecipitating Cu along with ZnS using H2S and thiourea. Photo- and electroluminescence studies indicate that these phosphors have better emission characteristics compared to the phosphors in which activator is externally added. Phosphors with luminescence at ~530nrn were prepared. The difference between the character...
Optical properties of Er doped Si=SiO2 superlattices and SiO=SiO2 superlattices are compared. In the case of Si=SiO2 superlattices with Si layers thicknesses between 2 and 19 nm polycrystalline like Si layers are observed after annealing. The samples show a very weak defect related red room temperature luminescence. No significant enhancement of the Er luminescence could be shown. The SiO=SiO2 ...
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