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Wednesday 18 Nov 2015 - 14:19 Makkah mean time-6-2-1437
Florida (IINA) - Researchers have developed a cheaper, more efficient light-emitting diode (LED), the technology that illuminates and delivers the picture on most modern TVs, UPI reported.
The key to the light's cheaper and 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," said physicist Hanwei Gao. "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.
A diode is a material that has been atomically manipulated to allow electricity to only flow in one direction. When two one-way flows 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 are primarily determined by the material it's made with.
The researchers 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 noted.
The organic-inorganic hybrid material is easily and quickly made, which the researchers hope will translate to cheap, scalable production.
"If you can get a low cost, high performing LED, everyone will go for it," Biwu Ma said, adding: "For industry, our approach has a big advantage in that earth abundant materials can be processed in an economic way to make the products".
AG/IINA
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