LED Breakthrough

[HavocXphere]

Cliffs: They've managed to improve the efficiency of white LEDs five fold. Almost 4x as efficient as Fluorescents.

Link (http://www.ecogeek.org/content/view/1415/)

Seriously cool stuff. :cool:

[rvanwyk]

this will change lighting in the world.

[boramk]

Samsung made LED moniters...They look so much better than LCD

[Messugga]

Those were OLED, if I'm not mistaken? Quite expensive as well

[rvanwyk]

Samsung made LED moniters...They look so much better than LCD

yes, OLED.

contrast ration > 1000000:1 compared to plasma at 10000:1 and LCD at average 2500:1

[rvanwyk]

OLED: Organic Light Emitting Diode

http://en.wikipedia.org/wiki/OLED

[Messugga]

But these are LEDs which could be used for lighting purposes, aren't they? Wonder what material they use. I know they use gold for blue... LEDs are interesting little things ;)

[HavocXphere]

But these are LEDs which could be used for lighting purposes, aren't they? Wonder what material they use. I know they use gold for blue... LEDs are interesting little things
Thats were the trick comes in. They used a blue LED which is mad efficient and coated the entire thing with "nano-crystalline coating" to break it into multiple wavelength....giving white light.:D

Not too sure how or why the coating does that. It just does.

I suspect they can apply it for lighting, screens and everything else once they figure out a way to reduce the cost of the coating.

[Messugga]

Read up on thin layers. On something like a camera lens, you have the coating which causes reflected light to be reflected back into the lens. Not only this, but wavelengths are synced up, out of phase, so that light passing through the layer gets nullified via destructive interferation. Fairly complex and difficult to do with white light as it consists out of a whole range of different wavelengths(the thickness of the layer's dependent on the wavelength of the light aimed to be stopped from reflecting). This LED works on the same principle, it seems, only, certain light is prevented from escaping the unit. Cool stuff.

[HavocXphere]

Read up on thin layers. On something like a camera lens, you have the coating which causes reflected light to be reflected back into the lens. Not only this, but wavelengths are synced up, out of phase, so that light passing through the layer gets nullified via destructive interferation.
That sounds suspiciously like a polarizing filter.


This LED works on the same principle, it seems, only, certain light is prevented from escaping the unit. Cool stuff.
Exactly the opposite. They started with only one wavelength (blue in this case) and they managed to break that into many different wavelengths = white light.

[ld13]

They started with only one wavelength (blue in this case) and they managed to break that into many different wavelengths = white light.

They use some of the blue, beak that down, joins it with the blue == warm white light - or something like that. Sounds awesome.

Now we just have to wait X years till we see this :(

[Messugga]

Havoc, polarization reflects 50%(roughly) of light entering the filter. Generally, polarizing filters, such as what you find on sunglasses, are vertical lines that have gaps between them thinner than the amplitude of a photon, thus stopping them from passing through if they have a horizontal alignment. Vertical because the surface of the earth polarizes light horizontally to a large extent. With thin layers, you don't decrease the amount of light entering the lens, but actually maximizes it. Theoretically, one can stop ALL light from reflecting, but we lack the engineering at the moment to achieve that. Reflected light = less information = bad.
Polarization is basic. Thin layers are way more advanced ;)

[HavocXphere]

Polarization is basic.
So is my optics knowledge apparently.:o


Thin layers are way more advanced
Closest I can find is Thin-film optics (http://en.wikipedia.org/wiki/Thin-film_optics). I assume its the same thing?

I found the technology they are using. QD-WLED. Quantum Dot White Light Emitting Diode. (http://www.google.co.za/search?hl=en&safe=off&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&hs=bi2&q=Quantum+Dot+White+LED&btnG=Search&meta=)

[Messugga]

Yup, that's the stuff I'm on about. Their explanation's sort of rudimentary though. The basic principle of it all is quite simple actually...up to a point where quantum mechanics start playing a part and things just stop making sense... to me, anyway :p

[scotty777]

quite a bright invention if you ask me

[Messugga]

No pun intended, right?

[gdiza]

No pun intended, right?

lol good one

[dablakmark8]

its about time.i need those