Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Let it glow

27.02.2017

OIST researchers design new photoluminescent compounds

Chemical compounds that emit light are used in a variety of different materials, from glow-in-the-dark children's toys to LED lights to light-emitting sensors. As the demand for these compounds increases, finding new efficient methods for their production is essential.


Photoluminescent compounds were synthesized by the Coordination Chemistry and Catalysis Unit glowing under a UV light.

Credit: Sarah Wong

New research from the Coordination Chemistry and Catalysis Unit at the Okinawa Institute of Science and Technology Graduate University (OIST) describes a new strategy for producing photoluminescent (PL) compounds with increased capabilities. This research was recently published in the Journal of Materials Chemistry C.

Production of PL compounds is typically centered around two main methods: the conventional metal-ligand system or an aggregation based system. The first method requires a complex ligand, or compound, that strongly binds to a metal ion in a way that would allow for the complex to emit light of certain wavelength. Unfortunately, this system is rigid and unable to be modified once the complex is produced.

In contrast, the aggregation-based system is driven by weak interactions between different molecules or their parts. This allows for tunability by shifting the color of light emitted based on interactions of the PL compound with the local environment. However, aggregation is typically difficult to control and thus not feasible to use in systems requiring precision.

Recent research from OIST scientists combines the best parts of both methods to produce PL molecules. "We wanted to create better photoluminescent compounds by combining the two previous concepts: the flexibility of the weak aggregation driven complexes and the controllability of the conventional metal-ligand system", explained Dr. Georgy Filonenko, postdoctoral researcher from the Coordination Chemistry and Catalysis Unit at OIST.

Researchers, led by Prof. Julia Khusnutdinova, designed compounds whose photoluminescence depended on weak interactions between atoms within the single compound molecule itself. As a result, they obtained the tunability of the aggregation-based system confined to a single molecule, without the need for intermolecular aggregation.

Akin to the conventional metal-ligand system, the molecules synthesized by Filonenko consist of a ligand and a copper ion which interact to produce photoluminescence. However, the ligand in the OIST-synthesized molecules is not rigid and has two cyclic-bonded atom structure, referred to as rings, stacked on top of one another that can interact just like in the aggregation system, but within a single molecule. Interestingly, researchers discovered that they could adjust the color emitted from these molecules based on the distance between these rings.

"We found that we could change the color produced by the compound based on what other groups of atoms were bound to the ligand," illuminates Filonenko. "Larger groups would cause the rings to move closer together, shifting the color to the orange-yellow range, while smaller substituents would make the rings move apart, turning the emission color red. The ability to tune the wavelength of light emitted from these molecules provides a huge advantage over the traditional metal-ligand PL complexes".

The tunability and controllability of these complexes makes them an attractive candidate for many applications. "We see a high potential for these compounds to be used as sensors due to their very high sensitivity to the surrounding environment," revealed Filonenko.

Kaoru Natori | EurekAlert!

Further reports about: photoluminescence single molecule wavelength

More articles from Materials Sciences:

nachricht Detecting damage in non-magnetic steel with the help of magnetism
23.07.2018 | Johannes Gutenberg Universitaet Mainz

nachricht Princeton-UPenn research team finds physics treasure hidden in a wallpaper pattern
20.07.2018 | Princeton University

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Future electronic components to be printed like newspapers

A new manufacturing technique uses a process similar to newspaper printing to form smoother and more flexible metals for making ultrafast electronic devices.

The low-cost process, developed by Purdue University researchers, combines tools already used in industry for manufacturing metals on a large scale, but uses...

Im Focus: First evidence on the source of extragalactic particles

For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.

To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.

Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...

Im Focus: Breaking the bond: To take part or not?

Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.

A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...

Im Focus: New 2D Spectroscopy Methods

Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.

"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Conference on Laser Polishing – LaP: Fine Tuning for Surfaces

12.07.2018 | Event News

11th European Wood-based Panel Symposium 2018: Meeting point for the wood-based materials industry

03.07.2018 | Event News

 
Latest News

Detecting damage in non-magnetic steel with the help of magnetism

23.07.2018 | Materials Sciences

Researchers move closer to completely optical artificial neural network

23.07.2018 | Information Technology

Enabling technology in cell-based therapies: Scale-up, scale-out or program in-place

23.07.2018 | Health and Medicine

VideoLinks
Science & Research
Overview of more VideoLinks >>>