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, which can be obtain literally from the environment – from vibrations of molecules, 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.
The transition requires very little energy
Due to the fact that the singlet state exists only for a Ireland Phone Number List 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. The most important (and sometimes difficult 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. The Phosphorescence Phenomenon Interestingly, some materials creat in the laboratory have the property of afterglow (phosphorescence) at room temperature.
The market for organic electronics is huge
When external exciting radiation, such as ultraviolet USA CFO 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 — over $40 billion in 2020 — and it perfectly dictates the research agenda for the coming decades. These are various “smart materials”, highly sensitive sensors, organic photovoltaics. At the same time, the use of organic semiconductors and diodes is not limit to electronic devices: laboratory scientists.