With the help of new colorless inks and crystal structures, chemists in the United States and Denmark have discovered a simple method to prepare the brightest fluorescent solids. This advancement can be applied to obtain solar energy, laser technology and biological imaging.
The fluorescent luminescence in the new material is called “small molecule ion isolation structure” (smileAccording to a new method discovered by researchers at the universities of Indiana (USA) and Copenhagen (Denmark), it can be translated into a solid and crystalline state without any problems.
He told SINC: “We have found a universal, simple and effective way to make the brightest fluorescent solids available.” Bo Weg LawsonDirector of the Nanoscience Center at the University of Copenhagen and one of the co-authors of the study, published in the journal today Chemistry.
Laursen explained that this discovery represents a significant advancement in the development of fluorescent solids, because “almost all fluorescent dyes used in dilute solutions are turned off in solid form.”
The stack of 3D printed spinning tops glows in the dark. / Amar Flood
“The advantage of our method is that it is a simple additive based on a standard commercial dye that can produce a solid with the same fluorescence and color as the dye in the solution, making the process simple and predictable,” the chemist concluded Tao.
In addition to anecdotes, the author also believes that this new material (SMILES) can be used in any technology that requires fluorescence, “including Solar energy, Bioimaging and laser” progress Ama Flood, Professor of Chemistry at Indiana University, is also a co-author of the paper.
According to Laursen, “When fluorescent dyes are normally turned off in a solid state, the energy from the light is lost in the form of heat. For all the above technologies, such as solar energy, photochromic glass or 3D visualization, avoid This type of heat loss is the key to its operation and subsequent optimization.
The key: colorless ink solution
Although there are currently more than 100,000 fluorescent dyes available, because they work in an unpredictable way, almost none of them can be used to make solid materials. These dyes tend to fade when they enter the solid state, thereby reducing their fluorescence intensity to produce a softer glow.
Flood said: “When dyes are combined with solid materials, there will be problems between cooling and coupling.” He said: “They are like children sitting together at the time of the story. They can’t each other’ Touch each other. They interfere with each other and no longer behave as personal actions,” he said.
To solve this problem, the researchers turned to a colorless solution Macromolecule The star shape prevents other fluorescent molecules from interacting with each other when the mixture is solidified. In this way, its optical properties remain unchanged.
So far, previous research has always turned to colorful solutions. However, Laursen and Flood believe that the key is that the solution is colorless.
“Some people think that colorless macrocyclic compounds are unattractive, but they make the insulating lattice fully express the bright fluorescence of the dye, and the color of the macrocyclic compounds cannot prevent this phenomenon.” Flood pointed out.
The author believes that this new technology will enable dye manufacturers to take full advantage of the full potential of this new material in the future. Currently, they prefer to concentrate on thoroughly understanding all its attributes.
They concluded: “We will have a basic understanding of how they work and provide a set of sound design rules to create new properties. This is essential for putting these materials in the hands of others.”
Benson Wait. “Plug-and-play optical materials for fluorescent dyes and macrocyclic compounds“. Chemistry, (August 2020).