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, which can be obtain literally from the environment – from vibrations of molecules, which are determin by the temperature of the environment. Accordingly, in order to obtain fluorescence with an efficiency of 100%, 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 and begin to emit light.
A more interesting way to use such materials
Due to the fact that the singlet state exists only for a Senegal Phone Number List nanosecond, and the triplets live 10 thousand times longer, Blue, r, green Depending on and acceptors in the emitter, the spectral color of the radiation changes. The most important (and sometimes difficult to reproduce) are Ls in the 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. “Blue materials can self-destruct because the energy of blue light is high—literally the highest in the visible range—and what is absorb by the material is wast on disrupting the structure of the molecules.
Which chemical groups are chosen as donors
This is how the material degrades. R Ls are difficult to USA CFO reproduce because they are very sensitive to external conditions (water, oxygen, high temperature) due to the design of the molecules.” The Phosphorescence Phenomenon Interestingly, some materials creat in the laboratory have the property of afterglow (phosphorescence) at room temperature 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). is the bioimaging of cells (for example, tumor cells.