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The brightest fluorescent material

20.08.2020

A team of scientists from Indiana University, USA, and the University of Copenhagen, Denmark, overcame several major challenges and developed the technology to produce what could be called the brightest fluorescent material to date. What's more, this new material can effectively act as a filler for paints and polymer materials, opening up possibilities for next-generation solar cells, lasers, and more.

The main problem that was mentioned in the first paragraph is the mutual influence of fluorescent particles that are placed inside a solid or liquid composition. These particles are arranged randomly, and most of the light photons they re-emit are absorbed by particles located in close proximity. Moreover, if the particles touch each other, then part of the energy of the absorbed photon of light is taken away by another particle. And all this, in turn, reduces the level of fluorescence, in other words, paints and solid materials look more dull than they could be with the "correct" arrangement of the dye particles.

The solution to this problem was the special star-shaped macrocyclic molecules that prevent the molecules of the fluorescent substance from touching and interacting. The composition of these macro-stars was mixed into the dye, and after that, the so-called ionic insulating lattices were formed in the solution. These lattices can be grown as crystals, dried and ground into powders, which in turn can be thinly applied to surfaces or incorporated into transparent polymeric materials to give them the appropriate color.

Previously, scientists have already tried to use macrocyclic molecules for a similar purpose, but in these attempts, scientists used colored molecules. Now scientists have used colorless versions of such molecules, which allowed the fluorescent dye particles to work "at full capacity" due to the presence of free space between them.

The new super-bright materials have many applications, according to scientists, including solar energy harvesting, lasers, information display technologies, materials with "switchable" optical properties, and so on. And in the near future, scientists plan to continue working on new materials in order to adapt their production to the conditions specific to each specific application.

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