Toward a Truly White Organic LED: Physicists Develop Polymer With Tunable Colors
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[url]http://www.sciencedaily.com/releases/2013/09/130913085437.htm[/url]
[IMG]http://images.sciencedaily.com/2013/09/130913085437.jpg?1379085044[/IMG]
[QUOTE][B]By inserting platinum atoms into an organic semiconductor, University of Utah physicists were able to "tune" the plastic-like polymer to emit light of different colors -- a step toward more efficient, less expensive and truly white organic LEDs for light bulbs of the future.[/B]
"These new, platinum-rich polymers hold promise for white organic light-emitting diodes and new kinds of more efficient solar cells," says University of Utah physicist Z. Valy Vardeny, who led a study of the polymers published online Friday, Sept. 13 in the journal Scientific Reports.
Certain existing white light bulbs use LEDs, or light-emitting diodes, and some phone displays use organic LEDs, or OLEDs. Neither are truly white LEDs, but instead use LEDs made of different materials that each emit a different color, then combine or convert those colors to create white light, Vardeny says.
In the new study, Vardeny and colleagues report how they inserted platinum metal atoms at different intervals along a chain-like organic polymer, and thus were able to adjust or tune the colors emitted. That is a step toward a truly white OLED generated by multiple colors from a single polymer.
Existing white OLED displays -- like those in recent cell phones -- use different organic polymers that emit different colors, which are arranged in pixels of red, green and blue and then combined to make white light, says Vardeny, a distinguished professor of physics. "This new polymer has all those colors simultaneously, so no need for small pixels and complicated engineering to create them."
"This polymer emits light in the blue and red spectral range, and can be tuned to cover the whole visible spectrum," he adds. "As such, it can serve as the active [or working] layer in white OLEDs that are predicted to replace regular light bulbs."
Vardeny says the new polymer also could be used in a new type of solar power cell in which the platinum would help the polymer convert sunlight to electricity more efficiently. And because the platinum-rich polymer would allow physicists to "read" the information stored in electrons' "spins" or intrinsic angular momentum, the new polymers also have potential uses for computer memory.[/QUOTE]
But no organic black LEDs? Proof that science is racist, everyone.
kind of cool how something that could dramatically lower the price of OLEDs uses platinum as a component
I hope we can have LED light bulbs that emit a nice warm yellow light instead of operation-table cold white. It's the only reason i currently dissaprove of LED lightning in houses. Hopefully they'll win me over with a more natural tint of light.
[QUOTE=Fatfatfatty;42177588]I hope we can have LED light bulbs that emit a nice warm yellow light instead of operation-table cold white. It's the only reason i currently dissaprove of LED lightning in houses. Hopefully they'll win me over with a more natural tint of light.[/QUOTE]
it's not 2007 anymore, we already have LEDs in the yellow area of color temperature
[editline]13th September 2013[/editline]
at least where i work, we do
[QUOTE=Generic Monk;42177580]kind of cool how something that could dramatically lower the price of OLEDs uses platinum as a component[/QUOTE]
And ironic being that platinum is probably the most expensive material on the planet right now
I read briefly about laser-based illumination being also doable, but I have no idea how and the story didn't go into a lot of detail.
The issue I see with LED's is they lose efficiency above 0.5A, so making brighter lighting eventually is going to stop being viable.
[QUOTE=S31-Syntax;42178468]I read briefly about laser-based illumination being also doable, but I have no idea how and the story didn't go into a lot of detail.
The issue I see with LED's is they lose efficiency above 0.5A, so making brighter lighting eventually is going to stop being viable.[/QUOTE]
Except that OLEDs have been made brighter by removing the expensive color filter that reduces luminosity by 80%. So they're well on their way and this only helps!
[QUOTE=viperfan7;42177636]And ironic being that platinum is probably the most expensive material on the planet right now[/QUOTE]
Like gold on the connectors for electronics? It's not really THAT weird.
[QUOTE=Fatfatfatty;42177588]I hope we can have LED light bulbs that emit a nice warm yellow light instead of operation-table cold white. It's the only reason i currently dissaprove of LED lightning in houses. Hopefully they'll win me over with a more natural tint of light.[/QUOTE]
They already exist.
It's just that consumers in your area prefers cold white and thus stores only sell those.
Supply & demand.
[QUOTE=Fatfatfatty;42177588]I hope we can have LED light bulbs that emit a nice warm yellow light instead of operation-table cold white. It's the only reason i currently dissaprove of LED lightning in houses. Hopefully they'll win me over with a more natural tint of light.[/QUOTE]
I hate yellow. I started replacing lights in my house with white ones. Apparently the rest of my family, excluding my brother, hated the yellow ones :P
None of them realized there were different color options. Now everything doesn't have a piss-yellow tone to it :D It comes down to personal preference of course.
Currently most LED light bulbs I see don't impress me all that much. They still compare themselves stupidly to incandescent bulbs. But once you compare them to fluorescent bulbs they really aren't that great, excluding lifetime. Plus they're more expensive. Although I'm thinking they might not last as long as indicator LEDs. And supposedly fluorescent bulbs are supposed to last like 5-7 years(more like 2-3 in my experience).
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