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Posted on 07/16/2025 9:57:06 AM PDT by Red Badger
Researchers from the Hong Kong University of Science and Technology (HKUST) School of Engineering say they have invented the world’s brightest and most energy-efficient quantum rod LEDs (QRLEDs).
Designed to maximize energy efficiency while delivering highly bright, deep green emissions “at the top of the color triangle,” these potentially breakthrough QRLEDs could replace organic LEDs (OLEDs) and quantum dot LEDs (QLEDs), and even in-development phosphorescent light emitting diodes (PHOLEDS), as the state-of-the-art LED architecture for smartphones, Televisions, and AR/VR devices by offering unprecedented color purity and a maximized color gamut.
In a statement announcing the breakthrough design, team leader Professor Abhishek K. Srivastava said their QRLED “paves the way for high-resolution, energy-efficient displays with unprecedented brightness and longevity.”
Digital displays used in smartphones and other electronic devices generate images using Light Emitting Diodes (LEDs). As resolution and display capacity have evolved, engineers have countered with more advanced LED designs, including OLEDs and QLEDs. Along with increased energy efficiency, these new LED designs also offer improved color purity and narrower emission bandwidths compared to traditional designs.
More recently, scientists have explored further improving the performance of these designs with QRLEDs. According to the research team behind the newest version, QRLEDs, which use a narrower quantum rod design than quantum dot designs, offer higher light coupling efficiency than the best OLEDs and QLEDs. This increased efficiency makes them brighter and clearer than their predecessors.
However, the research team says most incarnations “face challenges.” For example, QRLEDs’ green emission underperforms compared to quantum dot LEDS “due to inefficient charge injection, electron leakage at interfaces, and structural barriers.” These include thick insulating shells and long organic ligands, which are molecules attached to the outer surface of a nanorod that “hinder charge transport and stability.”
Curious if current QRLED designs could be improved to reduce or eliminate these shortcomings without sacrificing the benefits, Prof. Srivastava’s team designed an all-new QRLED structure. According to the team’s statement, this entirely new class of green-emitting quantum rods features a “customized core-gradient alloy structure with minimized outer shell thickness.” The researchers say the design improvements help their QRLEDs achieve “highly bright deep green emission” between 515 and 525 nanometers, which is “at the peak” of the so-called color triangle. The result is a maximized display color gamut that outperforms all previous LED designs.
To enable dense, void-free film packing, the team engineered the quantum rods at the heart of the new LEDs to have a shorter, uniform, and smooth morphology. To boost efficiency and stability, the QRLEDs also feature shorter ligands and a bilayer hole transport layer, collectively enhancing charge balance and suppressing electron leakage.
After designing their new QRLEDs, the team tested their performance and efficiency. According to their study, the new designs turned electricity into light with 24% external quantum efficiency compared to 22% for older models.
When tested for brightness per energy, the team said their new model produced 89 candela per ampere. This level of brightness per unit of energy is higher than all existing QRLEDs. The new designs also shone three times brighter than older green LEDS. According to the study, the new model achieved a tested luminescence “exceeding 500,000 cd m².”
Finally, the research team stated that their new QRLED design demonstrated operational stability of 22,000 hours. They said this level of durability positions their design for commercial display applications.
“We have successfully developed remarkably efficient and bright green-emitting QRLEDs by precisely designing the quantum rod composition, morphology, shape, and ligand structure, alongside the rational engineering of the device’s hole transport layer,” Prof. Srivastava said.
“Our work demonstrates that meticulous control over nanorod composition and interface engineering can lead to disruptive advances in optoelectronic performance.”
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I’ll have to try Greyhound. I love the other 3 you endorsed.
If you can hold your nose because of the starlet Jennifer Garner (”What’s in YOUR wallet?”, I recommend “Peppermint”. Also in the revenge genre, you might try “The Brave One” (tiny little Jodie Foster channeling Charles Bronson).
My retinas hurt just from reading this.
Let’s take one 60 watt incandescent light bulb. They use .72 cents per hour (less than a penny).
If you run them for 3 hours a day, every day, it will cost you about $7.88 to operate that bulb for a year (3 hours a day).
LEDs cost about .15 cents per hour to run. It would cost you about $1.64 to operate that bulb for a year.
Currently a 60 watt incandescent bulb will cost you about $4. You can get 60 watt equivalent LED bulbs for about $1 each, especially in bulk.
So yeah, LEDs are cheaper to operate and own. I still think the quality of the light sucks and they don’t last anywhere near as long as advertised.
LEDs cost about .15 cents per hour to run. It would cost you about $1.64 to operate that bulb for a year.
The day I have to worry about saving $6.24 a year for light bulbs will be the day I stop paying for hookers, alcohol, beer and cigarettes....... And that ain't gonna happen.
Yeah--I went from a 27" Sony CRT that I purchased in the late '80s to a 4K Vizio 55". I was quite impressed.
I think that old CRT still works. It's upstairs somewhere, I think.
Bring back CRTs... I did fine for 50 years and I was smarter than them 13 channels..12 VHF 1 UHF.
Rotary phones are better as well and no car should have a computer.
What the hell, even the cheap ones are better than the hands on kind.......
[[Bring back CRTs]]
Still using a CRT TV- can view at any angle and no fading or loss of contrast- Good enough for us- We don’t need to sit in direct lien of sight for best picture-
Still enjoying my Panasonic plasma from 2009. Great picture and it doesn’t watch me watch it.
[[Rotary phones are better as well]]
AMEN- they don’t switch screens on you when you twitch a finger, or hand to someone else- they don’t pop out the camera, or messaging app, or go online when all you wanted to do was make a phone call- They did one thing good=- good enough
“2001: A Space Odyssey” was released in 4K format. I believe in was remastered by Nolan.
Oh. I thought they were talking about light bulbs. On that topic, bring back incandescent bulbs!
Thanks for the ping.
#13 You can have a 4k tv then watch the old tv shows original broadcast in 480.
We’ve been watching old Highway Patrol episodes. They’ve been tweaked to look sharp and clear. Write to have 65” TVs and watch 1960s shows.
Are crappy movies or programs better in 4K? I tend to think they’d just be at a higher image resolution; but, crappy content just the same.
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