Posted on 06/24/2019 9:17:03 PM PDT by BenLurkin
Researchers drew attention three years ago when they reported that a two-dimensional perovskite—a material with a specific crystal structure—composed of cesium, lead and bromine emitted a strong green light. Crystals that produce light on the green spectrum are desirable because green light, while valuable in itself, can also be relatively easily converted to other forms that emit blue or red light, making it especially important for optical applications ranging from light-emitting devices to sensitive diagnostic tools.
But there was no agreement about how the crystal, CsPB2Br5, produced the green photoluminescence.
Now, however, researchers from the United States, Mexico and China, led by an electrical engineer from the University of Houston, have reported in the journal Advanced Materials they have used sophisticated optical and high-pressure diamond anvil cell techniques to determine not only the mechanism for the light emission but also how to replicate it.
They initially synthesized CsPB2Br5 from a related material known as CsPbBr3 and found that the root cause of the light emission is a small overgrowth of nanocrystals composed of that original material, growing along the edge of the CsPB2Br5 crystals. While CsPbBr3, the base crystal, is three-dimensional and appears green under ultraviolet light, the new material, CsPB2Br5, has a layered structure and is optically inactive.
…
The researchers said the new understanding of the light emission will yield new opportunities to design and fabricate novel optoelectronic devices. The techniques used to understand the cesium-lead-halide compound can also be applied to other optical materials to learn more about how they emit light, Bao said.
(Excerpt) Read more at phys.org ...
About dang time!
"I relate primarily to micas, quartz, feldspar. You can keep your pyroxenes, magnetites, and coarse-grained plutonics as far as I'm concerned."
Ahem. Sorry. Nice article. Anyone who can get practical results using a diamond-anvil high pressure cell is aces in my book.
i’ll wait to buy it at Walmart
I used to work with one of the co-inventors of the LED, it was just as new at one time but look at all the changes it has brought.
But these are all natural, so there!
The future of pixels.
thanks
..oh,.. well.. until the price comes down, I’ll stick with my Kryptonite.
:)
The beginning of the research on the ultimate weapon: turning any 3-D object into a 2-D object.
Does this mean better hog lights for my AR?
Possible use in gun sights to make the dots on the front and rear sights stand out?
Thanks BenLurkin.
So where can I buy this Green Light ? Sounds like a good future investment.
So You’ve worked with the Grey EBE’s, at the Bell Lab or Area 51 ?
Weren’t the walls of the structures discovered in antartica glowing a green hue.
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