Improved Version of QD-LED Displays with use of Engineered Quantum Dots

by admin on November 10, 2013

To improve quality of quantum dot light emitting diodes (QD-LED), a research team used a new generation of engineered quantum dots. This phase of development can be beneficial for future HDTVs.
QD-LED is a display technology that is in its development stage and its structure is similar to the organic light-emitting diode (OLED). However, it is different in terms of the light source. QD-LED is defined as Quantum dot light emitting diodes that are a form of light emitting technology and include nano-scale crystals to provide alternative for applications like as display technology. QD-LED consists of cadmium selendide (CdSe) nano crystals from which light comes. QD-LED technology is an improvement from LED and most of the smartphones and tablets now have it. It is considered that if QD-LED becomes successful then its display quality will be much better as compared to its predecessor.
Victor Klimov, a scientist from the Los Alamos National Laboratory (LANL) confirmed that QD-LED offers many advantages as compared to standard lighting technologies. Such as incandescent bulbs that work especially in the areas of operating lifetime, efficiency and the color quality during light emission. He is also the leader of the Nanotechnology and Advanced Spectroscopy team working on the QD-LED technology.
Researchers are making QD-LED specially narrow with tunable emission and easier to produce. Research of QD-LED had shown impressive results and it can be used for commercial purpose. The only problem that is left is called “droop“ in its efficiency. A “droop“ is the inability of a system that maintain a stable electricity generation that may cause lagging due to the speed error. Due to droop on displays unstable brightness can occur.

To control the droop researchers found a way on QD-LEDs and found the main cause that is defined as the Auger effect. The process recombines the electron and emits the energy as heat rather than photons.
To lessen the impact of the Auger effect and balance the flow of the electrons, the team engineered the quantum dots with a over a coating each quantum dot with cadmium sulfide.
According to Jeffrey Pietryga, a chemist in the nanotech team. This tuning of electron and hole injection current will be beneficial in maintaining the dots in a charge neutral state and this will prevent the activation of Auger recombination.

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