The energy difference between a singlet

Konstantin Ivanov 2nd year postgraduate student, Faculty of Natural Sciences, Novosibirsk State University. and a triplet state is like the number of steps on a flight of stairs between floors (how much energy do you ne to expend to go from one state to another). If the difference is large, then there are many steps, and there is not enough energy for the transition. If the difference is small, the transition requires very little energy – from vibrations of molecules, which are determin by the temperature of the environment. Accordingly, in order to obtain fluorescence with an efficiency.

Which can be obtain literally from environment

We raise” the triplet levels closer to the singlets (ruce the number of steps) so that the triplets easily (with less energy consumption) “jump” into singlets Azerbaijan Mobile Number List and begin to emit light. Due to the fact that the singlet state exists only for a nanosecond, and triplets live 10 thousand times longer, Blue, r, green Depending on which chemical groups are chosen as donors and acceptors in the emitter, the spectral color of the radiation changes.  to reproduce) are Ls in the r and blue parts of the spectrum. Novosibirsk scientists manag to bring the color spectrum of the radiation of one of the compounds closer to true blue.

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The most important and sometimes difficult

The Phosphorescence Phenomenon Interestingly USA CFO some materials creat in the laboratory have the property of afterglow (phosphorescence) at room temperature: when external exciting radiation, such as ultraviolet, disappears, the material emits a glow for some time. The simplest example where this can be us is in an office light alarm system (the well-known “Exit” signs above the doors). A more interesting way to use such materials is the bioimaging of cells (for example, tumor cells). Fluorescence in practice The market for organic electronics is huge — over $40 billion in.

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