First discovered in 1980, quantum dots (QDs) are nanocrystals composed of inorganic semiconductors that can tune their band gaps by controlling the size of their particles. This is also known as the quantum confinement effect. While QDs possess interesting optical properties such as sharp luminescence and broad absorption, they can also disperse in various solvents via introduction of proper organic capping ligands on the surface. Because of such versatility, we expect continued and increased research on QDs, with real-world applications in light-emitting devices, photovoltaic devices, biological imaging, and more.
A dipyrromethene-coordinated boron complex (boron dipyrromethene) shows a very small Stokes shift, high fluorescent quantum efficiency that is independent of solvent polarity, a large molar absorption coefficient, and a sharp excitation and emission spectra. Because of both an increasing demand, and with applications in fluorescent labeling reagents, laser dyes, and electronic materials, expect to see dipyrromethene dyes become an alternative to fluorescein and rhodamine dyes.
Thiacalixarenes are modified calixarenes in which the methylene subunits are replaced with sulfur atoms. For example, 4-tert-butylthiacalixarene [B2296] is regarded as an attractive host compound, as well as a starting material for various functional thiacalixarenes. Calixarenes, the third host compounds following crown ethers and cyclodextrins, have prominent host-guest recognition ability with extensive modifications to their structure carried out with the aim of discovering new functions and applications.
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