Shine bright like a nanoaggregate
Highly luminescent inks made from copper–iodine hybrid clusters with aggregation-induced emission
© Wiley-VCH
Luminescence is light emission triggered by some form of energy, which can be chemical, electrical, or radiation. For a long time, scientists thought that aggregation would be detrimental to luminescence. But in some substances, aggregation can be beneficial, researchers reported for the first time in 2001 when they observed that conformational changes turned a weak luminophore into a strong emitter. Since then, research on the so-called aggregation-induced emission (AIE) compounds has grown fast. One of the reasons: in real-world applications such as luminescent coatings and inks, the pigments usually adopt an aggregated state.
The team led by Hong-Bin Yao at the University of Science and Technology of China in Hefei, China, explores the preparation routes to AIE compounds, with the goal to prepare inks on a larger scale and without a big budget. A stable cluster of copper and iodine grabbed their attention. In combination with common phosphine ligands, this cluster was known to exhibit strong luminescence in its aggregated state, the typical AIE phenomenon. But a reliable way to get to that state, let alone applications, were not reported.
To prepare the AIE emitter, the starting compound must be present as a single, soluble molecule, then it is assembled and turned into something nanoparticular and non-soluble. The authors tackled the problem by employing an emulsifying–demulsifying process. By shaking the non-emitting complex dissolved in an organic solvent with a surfactant, they managed to confine the copper–iodine hybrid clusters in small droplets to obtain AIE-active nanoaggregates in a simple but effective way.
The method has another advantage: when swapping the ligands of the complex, the colors changed. The scientists replaced the phosphor ligand with a set of nitrogen-containing ligands and obtained a beautiful array of luminescent inks in colors ranging from orange to blue. With which they clearly enjoyed painting: Using their aqueous inks luminescing in orange, yellow, and sky-blue, they transformed a black-and-white sketch of an underwater world into an atmospheric exquisite aquarelle visible only under UV light.
Not only inks for paintings, but also color coatings for LED lamps were prepared. Normally, white LED light is difficult to achieve. Here, the researchers coated blue LED sources with yellow luminescent copper–iodine hybrids and observed the LED emission turning white. However, some adjustments still need to be made to increase the efficiency, the authors admitted.
Original publication
Chen Chen, Rui‐Han Li, Bai‐Sheng Zhu, Kun‐Hua Wang, Ji‐Song Yao, Yi‐Chen Yin, Ming‐Ming Yao, Prof. Dr. Hong‐Bin Yao, Prof. Dr. Shu‐Hong Yu; "Highly Luminescent Inks: Aggregation‐Induced Emission of Copper–Iodine Hybrid Clusters"; Angew. Chem.; 2018
Chen Chen, Rui‐Han Li, Bai‐Sheng Zhu, Kun‐Hua Wang, Ji‐Song Yao, Yi‐Chen Yin, Ming‐Ming Yao, Prof. Dr. Hong‐Bin Yao, Prof. Dr. Shu‐Hong Yu; "Highly Luminescent Inks: Aggregation‐Induced Emission of Copper–Iodine Hybrid Clusters"; Angew. Chem. Int. Ed.; 2018
Most read news
Original publication
Chen Chen, Rui‐Han Li, Bai‐Sheng Zhu, Kun‐Hua Wang, Ji‐Song Yao, Yi‐Chen Yin, Ming‐Ming Yao, Prof. Dr. Hong‐Bin Yao, Prof. Dr. Shu‐Hong Yu; "Highly Luminescent Inks: Aggregation‐Induced Emission of Copper–Iodine Hybrid Clusters"; Angew. Chem.; 2018
Chen Chen, Rui‐Han Li, Bai‐Sheng Zhu, Kun‐Hua Wang, Ji‐Song Yao, Yi‐Chen Yin, Ming‐Ming Yao, Prof. Dr. Hong‐Bin Yao, Prof. Dr. Shu‐Hong Yu; "Highly Luminescent Inks: Aggregation‐Induced Emission of Copper–Iodine Hybrid Clusters"; Angew. Chem. Int. Ed.; 2018
Topics
Organizations
Other news from the department science
These products might interest you
Dursan by SilcoTek
Innovative coating revolutionizes LC analysis
Stainless steel components with the performance of PEEK - inert, robust and cost-effective
OCA 200 by DataPhysics
Using contact angle meter to comprehensively characterise wetting behaviour, solids, and liquids
With its intuitive software and as a modular system, the OCA 200 answers to all customers’ needs
Tailor-made products for specific applications by IPC Process Center
Granulates and pellets - we develop and manufacture the perfect solution for you
Agglomeration of powders, pelletising of powders and fluids, coating with melts and polymers
Get the chemical industry in your inbox
From now on, don't miss a thing: Our newsletter for the chemical industry, analytics, lab technology and process engineering brings you up to date every Tuesday and Thursday. The latest industry news, product highlights and innovations - compact and easy to understand in your inbox. Researched by us so you don't have to.