I made quantum dots from scratch!

[@TechAltar]

Exclusive! Grab the NordVPN deal ➼ nordvpn.com/techaltar and get 4 extra months. Try it risk-free now with a 30-day money-back guarantee!

[@anandrochlani5226]

Hey is there any way to have one on one connect with you?big fan

[@soundspark]

No thanks; I'd rather not get scammed.

[@divyanshbhutra5071]

If you're going to make your own TVs in a factory, I'll buy...

[@aronseptianto8142]

QDOLED is one of those things that sounds like marketing jargon by slapping sci fi words to it but in reality it actually deserved the sci fi name

[@unreal_pictoris]

I thought exactly the same!

[@AshLordCurry]

Technologies names aren't really marketing jargon tbh. Depends on which scale, but even "Retina" means actually something interesting. Maybe a bit of a stretch to give it a name but it makes sense.

[@jeremyfisher8512]

Once you go QDOLED you wont go back its crazy

[@delphicdescant]

@@AshLordCurry Technology names *are* usually marketing nonsense, though. If you widen the context of this statement past just display technology, consider something like all the BS slapped onto labels of shaving razors or toothpaste or "as seen on TV" junk. That's how most technology names are in the consumer market.

[@verma100]

As a PhD in materials Science and Engineering, I can say that the science explanation you gave is both very simple and very accurate.

[@Stellectis2014]

Hey Captain, I found out years ago that a butterfly's wing color is dependent on the (to the effect of) cell structure distance. Why don't we have materials that react to electromagnetic fields on a nano scale that change it's structure to reflect/refract the light wave? I have always wondered if with a little bit of curiosity we could create a material that uses maybe a nanoimprint lithographic process. But at these scales the smallest amount of heat itself would possibly be unwanted colors. Is there such a technology? Could it be manufactured to possibly have an application like covering a house to cool it, or a color changing car, a new type of transistor. I am kinda an idiot but if I can please pick your brain? Thank you

[@fakech]

I like it when a tech channel makes a science video

[@johnlock2499]

As a viewer of Tech altar, it's amazing to see the evolution of his content production and his ability to explain concepts in such a straightforward and entertaining manner.

[@FengLengshun]

That's wild. Quantum mechanics being used in a 'boring' application of TVs and monitors? It's rad how we use insanely precise physics that we can't see for all these mundane stuff. Electricity is already one thing, but quantum mechanics as well? Damn.

[@JorenVaes]

Honestly, quantum mechanics are already used everytime you touch anything with semiconductors in them. The basic operating principles of transistors, diodes, and so on rely on the quantum principles that lead to energy bands.

[@FengLengshun]

@@JorenVaes reminds me of that one meme about how computers are essentially made by people who spent decades or even their entire live learning about the hidden principles of reality to be able to inscribe patterns onto rocks that would then manipulate unseen energies to achieve arcane effects that most people don't really understand but use every day to create information that is stored and transmitted through space-time at near instantly, accurately, reliably, more than billion times per device. Technology is just magic yo

[@Phoenix_1991]

@@FengLengshun and people use it to send dick pics. Puts everything into perspective 😂.

[@adamanggoro7258]

​​@@FengLengshuncomputers at basic level are just numerous switches, combined in a way that it will output a different result depending on how it was arranged in the first place. we have them so much it's enough to let us watch a video on our phone the basic principle is easy to learn, however the engineering feat to cramp those switches in a small package is what I'd call the true magic of humanity

[@asandax6]

​@@FengLengshun Take sand and rocks make it it into purer rocks, shine Holly light on them and zap with electricity and now they think. Then use runes in specific patterns to give them instructions. Yes magic is real. Mana is just money.

[@PelleCristi]

Definitely an unexpected more techy upload, very nice one.

[@james-cucumber]

That was an excellent video! Major kudos to PlasmaChem for having you and helping with this video.

[@patelfalak]

NileRed got competition in chemistry lessons 😮

[@RafidW9]

Delulu

[@acasccseea4434]

No really non organic chem, more like physical chem

[@asandax6]

Please no one compete with him lest he eat Enriched Uranium to top the competition.

[@bergamt]

“Now I have some quantum dots, so of course I’m going to taste them”

[@swaggery]

@@acasccseea4434 The crystals themselves are an example of physical chemistry. To make the crystals is very NileRed.

[@NorroTaku]

More physics and chemistry on TA lets goo More please Didn't know quantum dots were actually just small ass crystals

[@MrFrexxia]

3-5 years is code for "this shit is at least a decade away"

[@0xszander0]

5 yrs first product, 10-12 yrs first affordable consumer product. If they can make them work properly & scale. Still exciting stuff though!

[@Mister0Eel]

I’m not sure, from what I saw in this video and also heard elsewhere, they are very easy to manufacture, which is usually the biggest hurdle for things to go mainstream. That said, I would still guess 5-7 rather than 3-5 years haha

[@0xszander0]

@@Mister0Eel I agree. However the fact is that we really don't know. So I personally rather heir on the side of it taking longer. Which is usually the case with electronics. Especially scaling can often create new problems to solve.

[@Hyperus]

3-5 years is one of the longer estimates i have heard. Others are way more confident. Some breakthroughs are supposed to be announced at Display Week(which is in 2 weeks or so) and according to the guy from Digital Trends its mainly a matter of how soon and how bad companies want to make it happen. Fortunately, the manufacturing isn't some unknown variable, its only lifespan for blue at this point. I will reserve any guess, I don't know what the state of blue is exactly now.

[@Mister0Eel]

@@0xszander0 Very fair

[@HomeofLawboy]

The thumbnail and title really undersells how amazing the content of this video actually is

[@adamanggoro7258]

I finally understand when nanosys said the future of screens are printable, they were talking about electroluminesence. now I'm wondering why it has a very short lifespan compared to other display technologies very cool video TechAltar, your channel is really underrated. the quality is what I'd expect coming from a channel with millions of subscriber or more. the explanation is really easy to understand

[@Tsudico]

On the spectroscopy absorption graph it shows that the blue end of the spectrum is more energetic than the red end and it is the reason blue light is used as the backlight in existing QD tech. That also means however that in order to create the same luminosity in blue dots as what are seen in red or green dots it probably takes more energy to do so which could degrade the blue dots faster. The amount of energy used to make them shine brightly might also be enough to break the molecular bonds between some of the atoms contained within the crystal changing its structure and making it not function.

[@KJ4EZJ]

I watched this on the Samsung S95B! Beautiful. I had been following QD-OLED tech for years and got a TV and monitor with the tech as soon as it came out. Much more focused and narrow light spectra than OLEDs or LCDs and it makes a huge difference in the colors that are hard to describe. Everything looks more saturated like an AMOLED, but not so fake...the colors are perfect. I understand these panels are so expensive because they have to be layered in a vacuum chamber and there is a high rate of defects, so hopefully QDEL panels come soon and don't need a vacuum to make.

[@0xszander0]

This is so great! Electroluminescent quantum dots make total sense. If they can get it to work & scale.

[@ShadyTahaetr]

never expected a chemistry class from a tech channel, but Kudos to you for a great explanation

[@Federoy]

Amazing video. More hands-on videos like this! From the explanation, the animations, the videos (making a chemistry lab look clean and tidy is a feat by itself), everything in the video is top notch. Reminds me of Tom Scott and Veritasium videos. For more videos like this!

[@TheEducat0r]

Mind = blown! These little crystals are the unsung heroes behind our vibrant TV displays!

[@lucas8913]

8:33 Is that Dell Dimension running Windows XP? Crazy how many of those machines are still running strong in labs and factory floors around the world.

[@TechAltar]

Yeah, lol. I guess its only job is to interface with the spectroscopy machine so there's not point in changing it :D

[@dizzious]

QDEF is already being used in tons of displays. It's got amazing spectral uniformity.

[@unreal_pictoris]

I really love how you show us the physics behind soon real life appliances!

[@dodekaphilist]

As a chemist who is preparing nanoparticles myself it is very nice to see chemistry content on a tech channel. Although I think this might be too complex for the casual viewer :D

[@r0llinguphill483]

Man this would be great for Nighthawk lights and his passive cooling technology series

[@theJesai]

very cool stuff :) i didn't know you were into science - it's not always that we see a tech youtuber cover more sciency stuff, but i think it's amazing to see this intersection of science and tech.

[@JorenVaes]

I would argue the power in quantum dots lie not in their inherent behavior, but the fact that they are 'easily' massmanufacturable. We can think of all kinds of super strange metamaterials and similar - it is a very active field of research in electronics, material science, optics etc... But most of them are an absolute pain the create, limiting their use to niche applications with deep pockets.

[@himbeertoni08]

Making them in an 100 ml round flask is still far away from mass production. Since the reaction is extremely time sensitive, it cannot be easily scaled to larger containers. Continuous flow reactors for QDs are making impressive progress, but are still some way to go. Luckily, you only need extremely low amounts in displays.

[@thetaomega7816]

Just do it with 1000s of 100ml flask, like anyone cares about upscaling the process🎉​@@himbeertoni08

[@Simplicity4711]

Makes sense that the big mineral block appears black, since it mainly emits heat radiation / infra red.

[@fatiharaci]

quality of the video is on another level!

[@Nanamowa]

So theoretically we could use these as perfect narrow band reflectors of infrared light to prevent heat build up in solar pannels, but if you could perfectly reflect that radiation in a parabolic mirror shape, you could concentrate that light on a specific point. You could even have that point be an opal-like gradient that makes that specific band of light produce an interferance pattern so the lower energy light gets converted into higher wavelengths that don't carry heat, giving the pannel essentially perfect albedo.

[@Calebe311]

Another great video. Yours are always fascinating and wonderfully edited. Thanks for the submission.

[@Lucas-ku6gl]

Very cool video - thank you for explaining the topic so well!

[@Stellectis2014]

This almost looks like the equivalent of how light interacts with material at a nanometer scale similar to how a butterfly's wings are fluorescent. It sounds like the same concept.

[@HPP-Alexei-Antipov]

Looks similar, but this is a different effect. Butterflies are colored due to interference (wavelengths remain the same, just some colors get more intense). In QDs the wavelength changes - for example blue light is absorbed and red light is emitted.

[@nickelhusky4981]

9:34 you got an antibubble, how interesting lol

[@cefcephatus]

Electroluminescence might have electron stuck in the dots, unlike Photoluminescence that doesn't add more particle to the mix. So, having a non-emitting hole-doped material might help with the lifespan of electroluminescence. That adds complexity, but it doesn't take more energy, so I think, that's the solution. Layman's word: Put a small diode (NP) on the side of inside the solution container to drain excess electron out of the molecule. But if you want to control the frequency of that too, maybe a transistor (PNP) components would work.

[@PaweAdamowicz1981]

Nowy just take them, put infront of tiny solar panel, and check it's effisiency. Panels hate UV, but there will be no UV with this layer, only usable wavelenghts.

[@metacob]

Did you do this based on youtube stats showing that people who watch tech news videos also love science explanation videos? I'm not complaining, it's definitely a hit for me...

[@axtoncommander8312]

Man, With this upload you let your inner engineering German shine XD . Love your channel btw, keep up the good work !

[@Pyridius]

I remember originally coming to this channel for OnePlus and its relationship with Huawei. How far we've come!

[@ZuriPOL]

This was a great watch

[@lagmonster7789]

Well that video really brightened up my day 😁👍🏼

[@bruhder5854]

Nilered be like "today I made this quantum dot display from uranium I found lying around in my sofa"

[@misterhat5823]

He used his mom's piss.

[@PaulBunkey]

At 0:45 you acted for a stock video "chemist with chemicals" lol

[@himbeertoni08]

And as chemist, I would never face the UV flash light straight into my eyes direction. 😅

[@PaulBunkey]

@@himbeertoni08 And "face the UV flash light straight into my eyes" is expected from stock videos ;) This reminded me the famous stock photo of "Assembling computor" where a girl holds soldering iron above motherboard... holds by the "hot" part 🤣

[@spyrossrules]

damn, kinda crazy that this isn't too difficult to make

[@maz3808]

Thank you for this educationl video. A colleague of mine is working on Carbon quantum dots. I'm not sure if this company sells Carbon QD's? Also can I buy that catalogue @ 4:27 separately?

[@TechAltar]

Go to plasmachem's website, they should have it there IIRC

[@YdenPL]

so it's kind of like a CRT at the end of the day? except that luminophores are replaced by quantum dots, and the electron ray is replaced by blue light

[@lianneangelcortes4079]

Hello! We are high school seniors studying carbon quantum dots. May we know the procedure on how you were able to powderize your CQDs?

[@Gecko730]

I have a QD Oled monitor, compared to the best oleds in the world, even tough qd oled is not as bright, it just looks better. The viewing anlges are perfect too.

[@JusticeForQ]

I thought of the first title and thumbnail was much more enticing to watch. I probably would not have clicked on this video if I didn't already know what the last one looked like.

[@trex5333]

Wow i rili learned something new today 👍 Chemistry is fascinating

[@NothingXemnas]

9:30 I wonder if, instead of narrowing the color band, widening it would have greater use in visual systems like screens. Ever since the invention of color films and colored TV CRT screens, the light emissions were hyper narrow, so finding the right color combination (definitely not as simple as "red-green-blue") that properly matches human visual perception has always been tricky. However, human cone cells DO NOT function in specific emission wavelengths. In fact, the very reason we can see purple is BECAUSE of certain anomalies in the cone cells (red and blue are in the opposites of the light spectrum, so a substance that ONLY emits violet light closer to 400nm should solely look blue, but red cones have a weird bump in stimulus near that wavelenght).

[@HPP-Alexei-Antipov]

Absolutely. With QDs one can get also wide emission peak. Some types of QDs can yield peaks of 150+ nm width.

[@r0llinguphill483]

FANTASTIC! This saved me so much time I didn't want to spend reading about them.

[@smugwolff6828]

premium edition highlighter fluid

[@poptartmcjelly7054]

can quantum dots be used as ink for tattooing ?

[@TechAltar]

Many quantum dots are toxic and most are unstable when not sealed extremely well so I guess putting them in your skin would be difficult

[@desi_bhai_]

one of the few actual tech videos on this channel, otherwise its a tech companies buisness analysis channel

[@gsestream]

so only an emissive color paint in nano particles. like emission spectrum of a material when illuminated with electrons or photons. ie crt pigment. or just laser pumped crystals with certain band gap to push out wanted color photons when de-excitated. or just plain certain color nano/micro leds on a wafer.

[@paperogallo]

Neat! The process strongly reminds me of how synthetic opal is made

[@Pampali]

Fascinating. It could revolutionize digital ink jet printing. Potenciali ink made with quantum dots should not clog printhead nozzles, it make possible to print on any substrate not only white, prints colors perception could be less dependent on environment lighting...

[@tookitogo]

How would quantum dots fix those problems? Inkjets can clog even with dye inks (containing no pigments). As luminescent pigments, quantum dots wouldn’t work for reducing brightness, like inks do. We already have inkjet inks that can print on non-white substrates. And the wavelength-dependent absorption of quantum dots means that color reproduction would be highly dependent on the ambient light.

[@HPP-Alexei-Antipov]

Indeed, one can easily produce QDs-based inks. One can even make "invisible" print outs that shine only under black light.

[@matj12]

How does quantum-dot luminescence differ from fluorescence? It seems that displays could be made similarly with fluorescent materials instead of quantum dots. That is done in CRT monitors AFAIK.

[@Sigmatechnica]

Wonder if one could build a dye laser with quantum dot solution

[@misterhat5823]

How do quantum dots vary from phosphors? Sounds like a more difficult way of doing the same thing.

[@GasLei]

Amazingly educational video! Bravo!!

[@tatan321]

“Not only are they some of our earliest proof that quantum physics is real” I would have to take issue with this, we’ve had “proofs” of quantum physics from even before the discovery of quantum physics in the form of the double slit experiment (1801). Not to mention things like the atom bomb. Quantum dots were first synthetically produced in 1981 and I would say that the reality of quantum physics had been a settled issue for at least 40 years at that point.

[@squelchedotter]

There is a difference between experiments that show quantum effects vs ones that show our understanding of quantum physics is correct. E.g. the double slit experiment was successfully explained using various different models for decades, a lot of which were decently close (e.g. pilot waves). It's just that those theories did not explain other experiments as well as quantum physics ultimately would. Another case in point, the standard model of particle physics was also widely accepted decades before the higgs boson was actually found. But measuring it was still important because it conclusively validated all of the predictions.

[@1495978707]

Well, settled that it is real. Not so much settled how tf to interpret it, and entanglement

[@MasterChaoko]

I interpreted that statement as referring to the scientific exploration of black body radiation which began back in the late 19th century. Of course, that's still nearly 100 years after the double-slit experiment... but hey it's still better than being 200+ years wrong 😂

[@pa1kumarbhukya]

Can I add a quantum dot layer to my existing dled tv?

[@StarkRG]

ELQD (or is it QDEL?) sounds awesome.

[@raskerwar2508]

That would be an awesome ink for artist maybe

[@HPP-Alexei-Antipov]

One can even create a two-layer painting with one layer being visible only under the black light.

[@OscarRobbing]

Epic video as usual

[@devanshdas0404]

This video is awesome! Please make more content like this.

[@pashnyovv]

hm, can it be used in solar panels to make all spectrum from the Sun converted to green that actually needs for solar panels

[@TechAltar]

yeah, they are working on solar panel versions, though that tech isn't super mature yet

[@himbeertoni08]

And they're using the same concept to down convert green light into red for green houses, giving a decent increase in growth rate increase of plants. Leaves don't harvest green light, but reflect most of it.

[@FauzanARB]

Wow, your videos are amazing!

[@radun.9203]

Thank you! This film really clarified things for me!

[@hewlett6792]

Title change got my attention. Wasn't compelled at first to click. Nice one.

[@pashnyovv]

and, can low energy red light be converted to green or blue?

[@himbeertoni08]

That's possible by a two photon process, where two photons of lower energy - such as red - double excite one nanocrystal, which then emits photons of higher energy such as green or blue. However to my knowledge that's different types of nanomaterials, not quantum dots.

[@tallkaran]

this is such a good video 😭😭😭

[@Candy-uo8sv]

Does this mean if we get the right size we can get xray machines now without any radioactive materials????

[@HPP-Alexei-Antipov]

No, normally QDs need to be excited by light. But X-rays can be generated without radioactive materials, for example in an X-ray tube. Basically, any high voltage vacuum tube is a source of x-rays.

[@Eremon1]

Cadmium Telluride sounds like something that would end the world. Meanwhile it's just tiny crystals that refract light at slightly different wavelengths.

[@ArvidOlson]

This is so cool

[@truthsmiles]

I wonder if this has implications for solar panels… could photons be used to directly create electrons more efficiently?

[@MrRedLogan93]

Waiting for the NileRed video in which he turns a Tuna fish into quantum dots

[@lowlsqwid]

the first thing done after unlocking a new level of quantum mechanics is put it straight in a TV.

[@travelandbeyonds]

First Tech Altar video that I didnt understand at all.. 😅😅

[@metalbob123]

this video should have been sponsored by brilliant

[@Soraviel]

Qdots are interesting 🤔, especially in how they work to produce images (pictures and videos, sub pixels)

[@souravmp7851]

We are back to cathode ray tech.

[@alleskarlo]

My Bachelor Thesis was abaout Quantum Dots. I made QD-OLEDs myself.

[@gehteuchnichtsan7911]

This is by far the best tech channel. Its not about advertising products but education about politics, economy and science. ❤

[@hanve]

I have to watch your old video again

[@Rouxenator]

Today I learned where the Kia Telluride got its name from.

[@StrykerEXE]

I always wondered how they worked

[@ArtistTheArtist05]

Slowly but surely, we are going back to CRT tvs

[@012vinc]

So, if one puts a quantum dot solution with dots of any sizes in a centrifuge, will one be able to create a perfect rainbow?

[@gringopeete]

Wow!!

[@CYXXYC]

electroluminescence sounds like we are going back to CRTs

[@TechAltar]

Well, except that there are no cathode ray tubes, no electron beams and instead we have a flat panel matrix with quantum dots 😂

[@Gilotopia]

If it's so easy why does nobody sell ready made quantum dots?

[@TechAltar]

You can buy them ready made directly from Plasmachem's website

[@barrybritcher]

Cadmium? FFS we only just banned nicd batteries

[@himbeertoni08]

Congrats, you spotted the weak point. The amount of Cd is very low to the mass of a TV, but RoHS is a critical issue once regulations will get more strict. That is the reason why Samsung and Nanosys are using Cd free dots such as InP or ZnSe, but whose performance is weaker.

[@FauzanARB]

Can you ship some samples to NileRed?

[@Inirdin]

HOW DO THEY TASTE?

[@TechAltar]

These are poisonous so I imagine not great

[@pvc988]

@@TechAltar Death cap mushrooms are extremely poisonous yet they (reportedly) taste great.

[@ET_AYY_LMAO]

I dont understand how this proves quantum physics, to me it just seems like when the crystals gets to a certain size they will emit a photon only at a specific wavelength, that is not quantum physics to me, just physics - What am I missing here? I also think that you are saying something downright wrong in the beginning, you are using blue light, a short wavelength, if you used a red flashlight, only the larger quantum dots would light up, am I wrong?

[@himbeertoni08]

Quantum dots quite nicely follow the particle in a box model, since the HOMO-LUMO bandgap is only defined by the crystal size, not it's chemical composition.

[@ET_AYY_LMAO]

@@himbeertoni08 I just don't understand why it is considered a quantum effect? Light will not interact with any particle smaller than its wavelength. Im still not convinced that blue "quantum dots" would light up if red light was used in the first demonstration, am I wrong?

[@himbeertoni08]

@@ET_AYY_LMAO Quantum dots are way smaller than the wavelengths of visible light: typically between 5 and 15 nm. Absorption is not Rayleigh diffraction, where this limit applies. The colour is made by emission of a photon upon electron relaxation from the LUMO into the HOMO and this bandgap is larger for smaller particles. Also in the particle-in-a-box model, you've less options for standing waves or on other words you go from a continuous band of energy states into only discrete energy levels. That's a quantisation or quantum effect. Usually QDs are not capable of up-converting orange light. I think, that's an UV flashlight and the orange comes from the QD fluorescence.

[@ET_AYY_LMAO]

@@himbeertoni08 Oh okay, thanks for clarifying.

[@ET_AYY_LMAO]

@@himbeertoni08 Can you explain what LUMO and HOMO is while you are at it ?

[@Willitbl3nd]

No I think you made them is quite impressive.

[@ioxmedia]

@NileRed where are you at

[@mdnghtppl0000]

so cooool!

[@typxxilps]

hydrogen cells should be here within 5 years we had been told since mit 90s when Mercedes released a van based on an outdated MB100 (based on a chassis from the 60s developed by Hanomag Henschel). Then they introduced the A-class with enough space in the floor for battery and hydrogen cell. And since then nothing has been achieved and almost everything has been lost since then. Hopefully they are not using the same marketing trick we have seen before for hydrogen cells.