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Chinese researchers have developed multicoloured lights in a single solid as an alternative to traditional tricolour mixing approaches. Guangshe Li and colleagues at the Fujian Institute of Research on the Structure of Matter, in China, have successfully prepared novel core/shell CaWO4 micron spheres codoped with Na+ and Ln3+ (Ln3+ = Dy, Tb, Sm, Eu). The self-assembled particles showed a unique multicolour emission in the visible region when excited by a single-wavelength light source. These findings could simplify white light generation and relevant technologies.
In conventional LED light sources, several phosphors are used, with different wavelength excitation sources, to produce white light. The development of these multicolour lights in single solids could eliminate the complications of tricolour mixing approaches and prompt the discovery of more functional nanosized materials with adjustable light colours in single-phase oxides.
The motivation behind this work is that solid state white lighting has many promising applications and a huge market potential. This means that it is crucial to generate multicolour emissions in a single-phosphor by single-wavelength light excitation.
The next challenge is to 'effectively control the energy transfer by the design and assembly of materials for high quantum efficiencies of white light generation,' said Li.
Original article: Guangshe Li et al., Chem. Commun. 2008.
New coating is self-defence for seeds
Scientists in Switzerland have developed a protective coating for seeds that poisons pests with cyanide when they bite into it. The coating is a system of two layers and only becomes toxic when the layers are mixed, eliminating the problem of environmental contamination that is associated w ... more
Using bacteria to make electrodes
Scientists in France have produced hematite using a bacterial pathway for use as an electrode material in Li-ion technologies. Currently, most commercial electrode materials for Li-ion technologies are prepared using the ceramic method, which requires long heating periods at high temperatur ... more
Marine plant replacement for platinum in solar cells
An international research team has shown that that the power conversion efficiency of sea tangle extract is comparable to platinum in solar cell electrodes. Dye-sensitized solar cells (DSCs) are quickly becoming a widespread and affordable alternative to photovoltaic solar cells. The electr ... more
Royal Society of Chemistry – About us
With more than 51,000 members and an international publishing and knowledge business we are the UK’s professional body for chemical scientists, supporting and representing our members and bringing together chemical scientists from all over the world. more
Hear from RSC member Vicki Stone talk about her role as a Nanotoxicologist. more
When Food met Pharma: Delivery Strategies for Nutraceuticals
With growing prevalence of lifestyle-associated diseases, including obesity, Type II diabetes and cardiovascular disease, there is an urgent need and demand to try to prevent the onset of these diseases within our growing population. Nutraceuticals, along with appropriate diet and exercise, ... more
Royal Society of Chemistry (RSC)
The RSC is a leading international publisher of highly regarded journals and books in the chemical sciences. The RSC is also the professional body for chemists with a global membership of over 46,000. more
