A team of Florida State University materials researchers has developed a new type of light-emitting diode, or LED, using an organic-inorganic hybrid that could lead to cheaper, brighter and mass produced lights and displays in the future.
Assistant Professor of Physics Hanwei Gao and Associate Professor of Chemical Engineering Biwu Ma are using a class of materials called organometal halide perovskites to build a highly functioning LED. They lay out their findings in the journal Advanced Materials.
“Early work suggested perovskites could be a promising material to build LEDs,” Gao said. “But, the performance was not up to their potential. We believed there was significant room for improvement.”
Perovskites are any materials with the same type of crystal structure as calcium titanium oxide. Other researchers experimented with perovskites to build LEDs in the past but could not build particularly effective ones. Gao and Ma believed this organic-inorganic hybrid could perform better, if the formula could be appropriately tweaked.
“When we thought about this class of material, we knew it should perform better than this,” Ma said. “We came up with our novel approach to solve some critical problems and get a high-performance LED.”
After months of experiments using synthetic chemistry to fine-tune the material properties and device engineering to control the device architectures, they ultimately created an LED that performed even better than expected.
The material glowed exceptionally bright.
It is measured at about 10,000 candelas per square meter at a driving voltage of 12V — candelas are the unit of measurement for luminescence. As a benchmark, LEDs glowing at about 400 candelas per square meter are sufficiently bright for computer screens.
“Such exceptional brightness is, to a large extent, owing to the inherent high luminescent efficiency of this surface-treated, highly crystalline nanomaterial,” Gao said.
It was also quick and easy to produce.
Gao and Ma can produce the material in about an hour in the lab and have a full device created and tested in about half a day.
Additionally, while bare hybrid perovskites tend to be unstable in humid air, the nanostructured perovskites exhibit remarkable stability in ambient environment because of the purposely designed surface chemistry. Such chemical stability largely reduces the requirement of sophisticated infrastructure to produce this new type of LEDs and could be of huge benefit for cost-effective manufacturing in the future.
The research is crucial to the advance of LED technology, which is fast becoming an avenue to reduce the country’s electric consumption. LED lighting is already sold in stores, but widespread adoption has been slow because of the costs associated with the material and the quality.
But, LED lights do save energy.
According to the U.S. Department of Energy, residential LED lighting uses at least 75 percent less energy than regular incandescent lighting.
“If you can get a low cost, high performing LED, everyone will go for it,” Ma said. “For industry, our approach has a big advantage in that earth abundant materials can be processed in an economic way to make the products.”
The Latest on: LED
via Google News
The Latest on: LED
- Libya: Haftar-led forces declare truce in battle for Tripolion January 11, 2020 at 4:54 pm
The EU, Russia and Turkey were working to curb the fighting. Under international pressure, the forces led by Libyan general Khalifa Haftar declared a "conditional" ceasefire in their offensive to take ...
- NBC Announces Dwayne Johnson Comedy and Jimmy Fallon-Led Musical Variety Serieson January 11, 2020 at 4:08 pm
NBC’s slate of upcoming television shows includes “Young Rock,” a comedy about Dwayne “The Rock” Johnson’s childhood, and a Jimmy Fallon-led musical variety series titled “That’s My Jam.” NBC ...
- President Trump gives new details on what led to the killing of General Soleimanion January 11, 2020 at 4:05 pm
In response to Iran taking responsibility for shooting down a Ukrainian airliner, a senior White House official says Iran should "abandon its reckless ambitions and start behaving like a normal ...
- Nolley-led Virginia Tech defeats NC Stateon January 11, 2020 at 4:02 pm
Freshman guard Landers Nolley II poured in 29 points as Virginia Tech bounced back from an early hole to defeat visiting North Carolina State 72-58 on Saturday afternoon in Blacksburg, Va. Tyrece ...
- Led by Desmond Bane, TCU bests Oklahoma State to continue hot Big 12 starton January 11, 2020 at 2:36 pm
FORT WORTH, Texas — Desmond Bane led TCU with 20 points, nine rebounds and six assists and the Horned Frogs beat Oklahoma State 52-40 on a cold-shooting Saturday for both teams. The Horned Frogs (12-3 ...
- Jeremy Roenick apologizes for 'insensitive comments' that led to NBC Sports suspensionon January 11, 2020 at 12:47 pm
Roenick was suspended indefinitely on Dec. 23 for his comments on the podcast regarding co-hosts Kathryn Tappen, Patrick Sharp and Anson Carter.
- Joel Chaseman, broadcasting executive who led Post-Newsweek Stations, dies at 93on January 11, 2020 at 9:32 am
Joel Chaseman, a broadcasting executive who became chairman and chief executive of The Washington Post Co.’s broadcasting subsidiary, Post-Newsweek Stations Inc., died Jan. 11 at his home in North ...
- Spain's Nadal Secures Comeback Win to Set Up ATP Cup Final Against Djokovic-Led Serbiaon January 11, 2020 at 7:19 am
SYDNEY — Rafael Nadal secured a come-back victory against Australia's Alex De Minaur at the ATP Cup in Sydney on Saturday, propelling Spain into the final of the inaugural event to play the Novak ...
- Ice and snow led to treacherous road conditions in Kansas City Saturdayon January 11, 2020 at 6:37 am
The snowy weather led to some flight delays and cancellations at Kansas City International Airport Saturday morning. Scattered power outages were reported, but no city experienced widespread issues.
- Party confession led to arrest of driver suspected in 2017 Portland hit-and-run crash that killed pedestrian, records showon January 11, 2020 at 6:00 am
It was his third conviction for driving under the influence of intoxicants, Oregon court records show. Party confession led to arrest of driver suspected in 2017 Portland hit-and-run crash that killed ...
via Bing News