Electrons move constantly — think of tiny particles with a negative charge and attention deficit disorder. It is through the movement of these electrons that electric current flows and light is created.
|Ohio Eminent Scholar Andrew Steckl is one of the world's leading experts in photonics. (Photo by Dottie Stover)|
In considering materials to introduce to affect the movement of the electrons, Steckl evaluated the source of materials with an eye to supply, especially materials that do not harm the environment.
“Biological materials have many technologically important qualities — electronic, optical, structural, magnetic,” says Steckl. “But certain materials are hard for us to duplicate, such as DNA and proteins.” He also wanted a source that was widely available, would not have to be mined, and was not subject to any organization or country’s monopoly. His answer?
Steckl is pursuing this research in collaboration with the Air Force Research Laboratory. The research was featured recently in such premier scientific publications as the inaugural issue of naturephotonics and on the cover of Applied Physics Letters.
“The Air Force had already been working with DNA for other applications when they came to us and said, ‘We know that you know how to make devices,’” quotes Steckl. “They also knew that they had a good source of salmon DNA.” It was a match made in heaven.
“The driving force, of course, is cost: cost to the producer, cost to the consumer and cost to the environment” Steckl points out, “but performance has to follow.”
And what a performance — lights, camera, action!
“DNA has certain optical properties that make it unique,” Steckl says. “It allows improvements in one to two orders of magnitude in terms of efficiency, light, brightness — because we can trap electrons longer.”
When electrons collide with oppositely charged particles, they produce very tiny packets of light called “photons.”
“Some of the electrons rushing by have a chance to say ‘hello,’ and get that photon out before they pass out,” Steckl explains. “The more electrons we can keep around, the more photons we can generate.” That’s where the DNA comes in, thanks to a bunch of salmon.
|BioLEDs make colors brighter.|
“The story continues,” says Steckl, again smiling. “I’m receiving salmon sperm from researchers around the world wanting to see if their sperm is good enough.” The next step is to now replace some other materials that go into an LED with biomaterials. The long-term goal is be able to make “green” devices that use only natural, renewable and biodegradable materials.
This research was funded by the United States Air Force.
Here we have the “yin” of biological materials in photonic devices. See Steckl’s “yang” research placing electronics in biological materials: UC Engineering Research Widens Possibilities for Electronic Devices: NSF-funded engineering research on microfluidics at the University of Cincinnati widens the possibilities on the horizon for electronic devices.