Helter skelter helicenes

army.mil-57569-2009-12-01-061217.jpgDr Matthew Fuchter is a Senior Lecturer in Synthetic and Medicinal chemistry at Imperial College London. In close collaboration with Dr Alasdair Campbell from the department of Physics Dr Fuchter and his research group have dedicated some of their research to OLEDs and a group of molecules known as helicenes.

Laurence Pope: So what is an OLED? How do they differ from regular LEDs?

Dr Matthew Fuchter: OLED stands for organic light-emitting diode. They differ from regular LEDs in that the luminescent material used within them is organic, i.e. carbon-based. This organic material can be a molecule of low molecular weight, or a polymer.

LP: Your work focuses partly on helicenes. What makes them so important in OLED research?

MF: My group’s research came from a molecular interest in this class of molecule. When we started this work helicenes hadn’t been explored in any depth as OLED emissive material. There are already small molecules and polymers that have arisen from academic and industrial research, which produce light emitting devices with good efficiencies, wide colour pallets, long-lasting stability and so forth.

We came from another angle, exploring a feature of the helicene itself. Helicenes are thermally-stable polycyclic aromatics. Aromatic molecules are flat, but if you start to fuse them together you get to a point where the polyfused system can’t lie flat, as the rings start to bump into one another. That introduces a kink or a spiral into the molecule. Their electrons are still fully conjugated, but the molecule is no longer flat.

OLED_schematic.svg copyWhy are they interesting? For devices, I see there to be two key interesting features.

Because they’re not flat how they pack in the solid state is somewhat different to common OLED materials, which are flat. How molecules pack together in the solid state is important, with ramifications on light emission.

But also, because helicenes are helical they’re also chiral, and can therefore come in left- and right-handed forms. We were interested in how this chirality could potentially be exploited in organic devices.

Putting these features together we wanted to explore the idea of using helicenes as the organic emissive material in OLEDs. It’s an interesting new class of molecule in their own right, but also have the potential to directly generate polarised light.

Light can be polarised in certain ways. One form is circularly polarised (CP) light, where the light wave traverses as a helix, which also comes in left- and right-handed forms. Standard OLEDs produce unpolarised light, which needs to be specially filtered to generate CP light. We wondered whether you could use these chiral helicenes to generate a certain handedness of CP light.

To cut a long story short we found we needed a mix of organic materials, blended with small amounts of either left- or right-handed helicenes with conventional, non-chiral material. These OLEDs were able to produce circularly polarised light using different handed helicenes. It wasn’t 100% CP light, but rather enriched light.

Source: felixonline.co.uk

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I have many reasons

I won't list the ones that I came upon after I learned that there is such a term as "atheist" and got into researching it, but I'll list my earlier realizations as they came to me:
Early Childhood: I heard the neat stories about Noah, David and Goliath, and something about a guy in a whale by my mom mostly. Also was read The Time Machine, watched a little Star Trek, got taught that science was cool, and had a big encyclopedia set, didn't make much distinction between Jonah's whale and Pinocchio's since I was told Pinocchio's was "just pretend" and Jonah's sounded pretty similar

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  • Avatar Don Where can I download or read Helter Skelter book from my laptop?
    Aug 10, 2009 by Don | Posted in Books & Authors

    I wanna read the book Helter Skelter by Vincent Bugliosi, but I want to read it on my laptop. I seen people read at cafes like free reading of Unfortunate Events and others. And I'm young, so my parents don't think its good for me to read it. I wanna read it very badily, and I wanna learn alot about this. Where can i get downloads or websites that get me this book to read online?

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