Quantum dots are popular alternatives to organic dyes as fluorescent labels for biological imaging and sensing due to their small size, tuneable emission, and photostability.
32.
Generally, this sort of thing is called an " optical limiter " and there are various organic dyes that work this way, with various drawbacks.
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The color of the specific salt is due to the electronic structure in the d-orbitals of transition elements or in the conjugated organic dye framework.
34.
The photoluminescence spectra of quantum dots are also unique relative to organic dyes in that they are typically Gaussian-shaped curves with no red-tailing to the spectrum.
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Now with the adoption of chemical pigments, instead of the traditional organic dyes and pulp of palette has many colours to offer for painting the furniture.
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Unlike vermilion or red ochre, made from minerals, red lake pigments are made by mixing organic dyes, made from insects or plants, with white chalk or alum.
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Coumarin dyes are extensively used as gain media in blue-green tunable organic dye lasers . and they are also used as active medium in coherent OLED emitters.
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This means that the use of fluorescent quantum dots could produce a higher contrast image and at a lower cost than today's organic dyes used as contrast media.
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He was able to get organic dyes to attach themselves to the liquid crystals, and they would stay in position when pulled into alignment by an external field.
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Chilean born artist Marco Evaristti poured five liters ( a gallon ) of red organic dye into a fountain at Johannesburg's upmarket Mandela Square shopping mall late Sunday.
