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Samsung is working on self-emissive QLED diodes

Samsung researchers have found a new way to create self-emissive QLED diodes that extends their lifespan and efficiency, but it’s still not certain that displays with self-emissive diodes will come to the consumer market.

Dr. Eunjoo Jang and Dr. Yu-Ho Won, both researchers at Samsung Advanced Institute of Technology, published a paper in Nature about the new improvements to the quantum dot (QD) technology. Instead of using materials composed of toxic cadmium (Cd) on the QLED diodes, the researchers stated how using indium phosphide (InP) materials are better for the environment and increases the diodes lifetime to 1 million hours.

To “etch out the oxidative InP core surface” that comes with the thickening of the initial Zync Selenide shell, the researchers needed to introduce hydrofluoric acid. The thickness of the shell prevents energy transfer, maintaining high luminescence efficiency. The ligand that was initially on the surface is replaced with a smaller one, for an improved charger injection.

The decision to use InP increases the “theoretical maximum external quantum efficiency” to 21.4%, and the maximum brightness to 100000 cd/m². These numbers are comparable to the numbers from cadmium-based self-emissive QD-LEDs.

The QLED displays of nowadays use Cd-free QD, but not as a light source. It’s used as a “film on Liquid Crystal Display”, emitting the light absorbed from the backlight.

According to ZDNet, a Samsung spokesman refused to comment on the commercialisation of self-emissive QLED displays.

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