Tomáš Slanina explains the remarkable blue color azulene, a molecule that scientists have puzzled for decades.
Its chemical structure is similar to that of mothballs, but it has eight hydrogen atoms instead of seven.
It also has a ring-shaped structure and is highly stable.
However, its fluorescence is observed only from its second most excited level to the ground state, not its first.
Azulene seems to defy Kasha’s rule, which states that light energy should always be released at the lowest energy state.
In fluorescence, however, we observe the opposite effect.
Light is absorbed, the molecules are excited, and then they release light in another form.
The molecule drops from the highest energy state to the lowest one.
This process takes about 1,000 times longer than expected.
Tomáš suggests that applications using light could be tailored to exploit this property as an advantage.
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