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Samsung says it has overcome the limitations of blue QLEDs

By Ng Chong Seng - on 22 Oct 2020, 7:13am

Samsung says it has overcome the limitations of blue QLEDs

(Image: Samsung.)

Five years since the launch of its first quantum dot TV in 2015, Samsung is still working on improving the technology. A data point: the company has now amassed over 170 patents on element structure alone.

According to the company, its latest achievement is that it has successfully overcome performance issues of its cadmium-free blue quantum dot light-emitting diodes (QLEDs).

By using double emitting layers and shorter ligands on the surface of the blue-light-emitting QDs, the researchers at the Samsung Advanced Institute of Technology (SAIT) claim that they’ve now increased blue QDs’ luminous efficiency by 20.2%, peak luminance to 88,900 nits and lifespan to 16,000 hours (at half brightness of 100 nits).

For those wondering about the significance of this development, know that of the three primary QLED colours (red, green and blue), the blue semiconductor particles are the toughest to deal with. Possessing the largest band gap of the trio, blue QDs tend to oxidise faster than the other colours when exposed to external light, which lead to a quicker drop in luminous efficiency and shorter lifespan. This is one reason why full-RGB QLED displays are so hard to make (QLED displays today typically pair a QD film with red and green QDs with a blue LED backlight).

Source: Samsung.