. | . |
Scientists build cheaper, better LED by Brooks Hays Tallahassee, Fla. (UPI) Nov 17, 2015 Florida State researchers have developed a cheaper, more efficient LED, or light-emitting diode, the technology that illuminates the modern, energy-efficient home and delivers the picture on most flat screen TVs. The key to the light's cheaper, brighter glow is a newly developed class of materials called organometal halide perovskites. "Early work suggested perovskites could be a promising material to build LEDs," physicist Hanwei Gao said in a press release. "But, the performance was not up to their potential. We believed there was significant room for improvement." Gao and his colleague, chemical engineer Biwu Ma, spent months using synthetic chemistry to fine-tune the materials in the lab, tweaking the molecular architecture. An diode is a material that has been atomically manipulated to allow electricity to only flow in one direction, like a one-way street current. When two one-way streets are forced onto each other, the electric energy escapes in the form of photons. The power, color and efficiency of a diode's light-emitting properties is largely determined by the material its made with. Gao and Ma designed a perovskite material capable of emitting 10,000 candelas per square meter when powered by 12 volts. The diodes in most computer screens put out just 400 candelas per square meter. "Such exceptional brightness is, to a large extent, owing to the inherent high luminescent efficiency of this surface-treated, highly crystalline nanomaterial," Gao explained. The organic-inorganic hybrid material is easily and quickly made, which the researchers hope will translate to cheap, scalable production. LEDs are much more efficient than other lighting sources, but adoption in the home has been slow-going due to their relative expense. "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 new diode material was recently described in the journal Advanced Materials.
Related Links Satellite-based Internet technologies
|
|
The content herein, unless otherwise known to be public domain, are Copyright 1995-2024 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. General Data Protection Regulation (GDPR) Statement Our advertisers use various cookies and the like to deliver the best ad banner available at one time. All network advertising suppliers have GDPR policies (Legitimate Interest) that conform with EU regulations for data collection. By using our websites you consent to cookie based advertising. If you do not agree with this then you must stop using the websites from May 25, 2018. Privacy Statement. Additional information can be found here at About Us. |