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Chinese scientists have turned copper–iodine cluster molecules into aggregated, highly luminescent nanostructures for use in light-emitting diodes (LEDs). The solid-state assemblies made of complexes of the copper–iodine cluster with phosphor–organic compounds as ligands are easily prepared, cheap, and can emit light in many colors, they report in the journal Angewandte Chemie. The nanoaggregates can be used as luminescent inks for invisible paintings and color coatings for LEDs.
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.
Team - Hong-Bin - Yao - University - Science
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...
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