Inverted Fluorescence
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Umgekehrte Fluoreszenz
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New Chromophores Emit Light in UV Region when Excited with Visible Light
Written by AZoOpticsDec 21 2020
In general, fluorescence involves the transformation of light at shorter wavelengths to light at longer wavelengths. Now, researchers have come up with a new chromophore system that works inversely.
Image Credit: © Wiley-VCH, Angewandte Chemie.
When fluorescent dyes are excited by visible light they emit light in the ultraviolet region. Published in the
Angewandte Chemie journal, the new study reports that light upconversion systems such as those could increase the light-dependent reactions for which efficiency tends to be essential, like solar-powered water splitting.
At shorter wavelengths (high energy, for example, blue light), fluorescent dyes tend to absorb light and at longer wavelengths (low energy, for example, red light), they emit light. Upconversion of light is even more complicated to achieve. Upconversion implies that a fluorescent dye is excited with radiat
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Fluorescence usually entails the conversion of light at shorter wavelengths to light at longer wavelengths. Scientists have now discovered a chromophore system that goes the other way around. When excited by visible light, the fluorescent dyes emit light in the ultraviolet region. According to the study published in the journal
Angewandte Chemie, such light upconversion systems could boost the light-dependent reactions for which efficiency is important, such as solar-powered water splitting.
Fluorescent dyes absorb light at shorter wavelengths (high energy, e.g. blue light) and emit light at longer wavelengths (low energy, e.g. red light). Upconversion of light is much more difficult to achieve. Upconversion means that a fluorescent dye is excited with radiation in the visible range but emits in the ultraviolet. Such dyes could be used to run high-energy catalytic reactions such as solar-powered water splitting just using normal daylight as an energy source. Such dyes wo