More transparent and brighter LEDs soon

By BizLED Bureau

Nov 30, 2015: Researchers from University of California-Berkeley have discovered a simple way to make monolayer semiconductors, which are less than a nanometre thick, yet more efficient and defect free. This discovery will open the door to more applications of monolayer materials, such as MoS2, in devices like LEDs and high-performance transistors.

Monolayer semiconductors have become much talked about thing as they could be quite useful in the development of transparent LED displays, ultra-high efficiency solar cells, photo detectors and nano-scale transistors. But the films are riddled with defects, killing their performance. However, these researchers found a simple way to fix these defects through the use of an organic superacid.

The chemical treatment gives 100-fold increase in the material’s photoluminescence quantum yield–a ratio that describes the amount of light generated by the material versus the amount of energy put in. The greater the emission of light, the higher the quantum yield and the better the material quality.
Researchers enhanced the quantum yield for molybdenum disulfide, or MoS2, from less than 1% up to 100% by dipping the material into a superacid called bistriflimide, or TFSI.

This treatment also has revolutionary potential for transistors. When devices in computer chips get smaller and thinner, defects play a bigger role in limiting their performance.

Original Article at Biz LED Magazine: http://bizled.co.in/more-transparent-and-brighter-leds-soon/