LEDs in liquid nitrogen

Рет қаралды 237,229

tesla500

8 жыл бұрын

Running some small LEDs as well as a 100W white LED in LN2

Пікірлер: 230

@landonferguson7282 7 жыл бұрын

clear led's are the only ones that change color because they don't have to go through a filter of colored plastic. The colored plastic ones change color in the diode but change back when they go through the colored plastic.

@quistan2 7 жыл бұрын

correct, I was about to type all that, thanks for doing it for me.

@landonferguson7282 7 жыл бұрын

your welcome

@james10739 7 жыл бұрын

landon Ferguson makes sense i really have only ordered the clear ones myself

@GRBtutorials 5 жыл бұрын

Actually, no. LEDs are pretty monochromatic (except “white” LEDs which use a phosphor to convert blue to white), and the colored plastic acts as a filter, which doesn’t change the wavelengths emitted, it just attenuates some of them. So it would just look less bright. Try it: run too much current through an LED, but not enough to burn it, and you’ll see it changing color (I heard green ones work well).

@markbell9742 8 жыл бұрын

Safety Note: Wrap your glass dewar with cloth medical tape so when (not if) it implodes you will only be showered with liquid nitrogen not glass shards. Cheers, Mark ******************************

@tesla500 8 жыл бұрын

+Mark Beeunas Are these vacuum flasks known to spontaneously implode?

@markbell9742 8 жыл бұрын

+tesla500 Well, yes and no. Probably not spontaneously, but if you bang into it with the supply dewar when filling, or when you loss hold of your test piece and drop it through the bottom, or if you knock it over. I have had a few dewars inexplicably implode while filling and my guess is some type of flaw was present possibly just a scratch. We also either plastic coated or caged glass vacuum vessels larger than about half a liter. Cheers, Mark *******************************

@TheRealFobican 8 жыл бұрын

Would that liquid nitrogen work better than most options of energy containment if you want great density for an EV?

@markbell9742 8 жыл бұрын

@Teth47 7 жыл бұрын

Are you talking about having a closed loop LN2 cooling system? No point, water has a higher specific heat capacity and batteries don't work at those temperatures because chemistry basically stops happening.

@goyabee3200 7 жыл бұрын

Probably would have been cool to point a spectroscope into the flask and observe the change in wavelength.

@motormaker 8 жыл бұрын

When my father was a boy "1955ish". A man came to their small country school and did a science show for the kids. He cut a strip of rubber from an inner tube froze it in liquid nitrogen and drove it into a board with a hammer. The hammer head was made from Mercury. He had a small hammer head mold that the hammer handle fit into, he then poured the mercury and dunked the whole thing into the nitrogen. So yeah. Can you pound a rubber nail into a board with a Mercury hammer? I've heard this story many times since I was a boy. I hope to see it some day.

@maxbrewster245 8 жыл бұрын

I did this same experiment a few years ago. When we dipped the LED into the liquid nitrogen, we increased the current through the LED, I can't remember the exact amperage figure but when it got to a few amps it suddenly transitioned to much brighter. My co-worker who arranged this experiment had read that after this transition the LED light becomes coherent (ie: laser light). We were using regular colour LEDs, not the white ones with the phosphor coating.

@DextersTechLab 8 жыл бұрын

how about frequency changes in quartz crystals? If they survive the thermal shock!

@ketturi 8 жыл бұрын

+DextersLab2013 I was going to suggest that too

@ketturi 8 жыл бұрын

+DextersLab2013 I was going to suggest that too

@mikeselectricstuff 8 жыл бұрын

LN2 versus hot object on high speed camera please!

@aaronwaffles 8 жыл бұрын

+mikeselectricstuff RHNB? +carsandwater

@alllove1754 Жыл бұрын

Bravo. Seriously, thank you. You answered questions i was just positing. Cant wait for the S/LEDs... dip em when they come

@ProDigit80 7 жыл бұрын

In Liquid Nitrogen, you could overvolt the LEDs. I remember connecting those 3V 1970's leds to 9V, and for a while they would work in cool water. But in nitrogen, they should work a lot longer, and a lot brighter.

@vcannoodt7891 7 жыл бұрын

sometimes you can 'repair' broken rows by gently applying force along the row with a tine screwdriver. I had a 100W LED that had some bad rows and it did the trick

@emerybryant 8 жыл бұрын

:o that led thing looked awesome!

@kacieisaacks3033 7 жыл бұрын

Cool video..I work with N2 everyday and yes you can get about 7 months out of that tank as long as you don't set it on concrete..also instead of the metal thermos you may have better luck with a styrofoam ice chest that's what most of the ranchers use when they poor there n2 out of the tanks to work with embryos and what not...it will hold the nitrogen longer than the thermos..again very cool

@davidgustafik7968 8 жыл бұрын

Hi, it's possible that you did not see a change in color in the LEDs because most of the color is guaranteed by the plastic body of the LED. Try dipping some clear body LEDs. Also, do this ONLY in a very well ventilated room - a small volume of liquid nitrogen can displace vast quantities of air and you get oxygen displacement, which is nasty.

@fen4554 7 жыл бұрын

You might mention this somewhere in the video, but the LED brightness might be fooling you. I understand that supercooling can lower resistance, but when you put the led in the base of the flask, you're half-building a flashlight.

@ParadoxTheHybrid 7 жыл бұрын

Now this is some proper torture testing, I like it!

@peteladue432 7 жыл бұрын

Wouldn't the change in the brightness of the LED diode be controlled by the how the light is reflecting through the AQ Ni. ? and the flask it's self is very reflective?

@boydbros.3659 6 жыл бұрын

dude, this was really cool ...

@josh580 6 жыл бұрын

jeezus ... that high frame-rate is really trippy o.o Also I think the reason the more modern ones get brighter is because of thermal efficiency equaling to less resistance.

@varikvalefor 6 жыл бұрын

The ending made me chuckle.

@timeremapperegor1249 7 жыл бұрын

A big LED giving much more UV light, you can see a blue color through the luminophore,which making white light out of UV. Interesting video, thanks!

@bruceheadley7191 11 күн бұрын

Did this a work a few times .. it's impressive how much light an HP high efficiency red LED could emit, and how long it could do so .. i think we got it up around 4 Amps, as long as it was submerged

@christianrosing8929 2 жыл бұрын

The led matrix nearly looked like a reactor core inside the nitrogen 😊

@frontporsche 7 жыл бұрын

Why are you using LED encased in *colored* plastic? That (obviously) would make it hard to see a color change of something *inside* the plastic.

@JeepVideoGuy 8 жыл бұрын

Very interesting video!

@Alexelectricalengineering 8 жыл бұрын

Awesome, I want see transistors (IGBT, MOSFET, etc.) in liquid nitrogen !! Thumbs up :D Alex

@Barrybados 7 жыл бұрын

Well i boiled water with a 10 watt led but this is the other end of the scale : ) .

@Ozziepeck11 8 жыл бұрын

Led's are basically a short circuit, by cooling them down you mess up the circuit that goes with them, (by affecting its resistance) the circuit normally prevents the Led from drawing in infinite amount of current, probably why the 100W led started drawing a high voltage level.

@MrKillerpics 8 жыл бұрын

i would love to see High-temperature superconductivity experiments ^^ Maybe too expensive and/or hard to get or noise performance experiments with CCD and CMOS sensors

@MrKillerpics 8 жыл бұрын

+MrKillerpics Peltier effect videos would also be nice ^^

@1337Shockwav3 8 жыл бұрын

Does liquid nitrogen not conduct ... or is that the Leidenfrost-effect doing it's job? Didn't mention any special isolation, so I'm a bit confused.

@ceasefire066 7 жыл бұрын

LEDs are made from semiconductor .the semiconductor has negative temperature coefficient.So as temperature decreases the resistance increases(opposite to conductors).. and as resistance increases the voltage drop across it increases and thus it has gone brighter..

@vancouvercameracyclist5109 7 жыл бұрын

From LED datasheets, heat tends to decrease the brightness of yellow LEDs the most. If the junction temperature is very high, its lumens can decrease to 10%. You would need light measurements to find out if the luminous efficacy increases with liquid N2.

@richbones8419 7 жыл бұрын

interesting how its cracked to temperature shock and came back on after warming up.

@eivilcow33 7 жыл бұрын

Hmmm will the plastic change color when I cool it down? No? I have no idea what's happening!!

@Teafoam 7 жыл бұрын

I heard sitting in liquid nitrogen is the best way to get rid of crabs.

@TheFlacker99 7 жыл бұрын

Interesting. Very nice audio quality, it makes me think what would happen if you put a microphone in liquid nitrogen .

@adamthedog1 7 жыл бұрын

TheFlacker99 (Flak) Nothing really, AFAIK.

@nickhill9445 8 жыл бұрын

Appears optimal LED temperature is well above LN2 boiling point but apparently below 0c.

@JVerschueren 8 жыл бұрын

As a matter of interest, what was your thinking behind this video? -did I miss any tricked videos where this colour changing effect was supposedly demonstrated for the non-white LEDs? I mean the colour of emitted light in those cases is tied to the very nature of the doping element involved and temperature, as far as I'm aware, doesn't change the absolute level of excitation which needs to be overcome for them to emit a photon of a particular colour, hence only the brightness is affected by temperature. QED. It's only when you bring a secundary effect into the mix, i.e. the phosphorous translating blue light into white light, a second, temperature dependant (things need to vibratre at a certain amplitude to excite the main, light emitting, material) phenomenon manifests itself. Not wanting to critisize as such, but this result was to be expected. It's cool and all, but: why?

@tesla500 8 жыл бұрын

Here's a video where they put an orange LED in liquid nitrogen causing it to turn green: kzfaq.info/get/bejne/at1he8yXq8fdfok.html

@JVerschueren 8 жыл бұрын

Mmmyeah, and the 1st 5 comments on that video are from people saying they can't reproduce the effect. I don't know whether they're using a bi-colour led (which glows orange when both substrates are driven) and the cold shifts the output such the green can overpower the red, or somesuch, but the phyisics behind this is the electrons in the dopant can be in a finite number of states and the fact of exciting them to the higher ones and having them drop back down emits a photon of a certain wavelenght. This takes a finite amount of extra energy and is thus, in theory, independant of temperature other than it will happen more at lower temperature as there's less "noise" due to temperature.and overal conductivity is increased. I might be missing something, but unless there's a video explaining the phenomenon instead of merely showing it, I'm going to err on the side of the colour change being a trick.

@Hoch134 7 жыл бұрын

I think the problem was that you didn't use clear LEDs. There are clear LEDs which have different colours but a clear type of glass around. The ones I found in a quick search were called "waterclear" or "transparent". Buy a few of them on ebay and I am sure they will work.

@GRBtutorials 5 жыл бұрын

It does work, you just need the right type of semiconductor, and it also works with lasers! Watch this: kzfaq.info/get/bejne/a7ahqK2VrrHDqmw.html.

@TheError404 7 жыл бұрын

It would be interesting to see a small brushed motor run in liquid nitrogen

@Brant92M 8 жыл бұрын

How do voltage references/regulators perform in LN2? What about ceramic caps and other passives?

@MakeTestBattle 8 жыл бұрын

That was really neat. :D -Justin

@thesmallestatom 8 жыл бұрын

Dude, you're awesome!

@ddrl46 8 жыл бұрын

Perhaps a CCD in liquid nitrogen?

@DanFrederiksen 8 жыл бұрын

maybe how copper lowers in resistance. see if copper can be used as a flash nmr imager

@pauls5745 6 жыл бұрын

interesting :) but shouldn't you take all precautions when handling LN2?

@eligonzales186 2 жыл бұрын

How long does liquid nitrogen last when exposed? Let's say I put it on a plastic cup?

@octaviobermudez7426 7 жыл бұрын

why the voltage increase with low temperature ,in semiconductor material the resistance is going down with high temperature? dont find logic .

@DJRobbie54 8 жыл бұрын

WOW That was COOL. Nice Video. YOU GOT BALLS.. lol lol lol

@witeshade 8 жыл бұрын

Ah and how about seeing if you can turbocharge a peltier element. See how much power you can generate by, for example, having a power resistor heating up one side and having the heat sink on the other side dipped into the nitrogen.

@christopherleubner6633 Жыл бұрын

Try LN2 cooling 635nm laser diodes. They lase orange at anywhere from 625nm to 607nm depending on which type is used.

@Patchuchan 8 жыл бұрын

Put some laser diodes in LN2 though I suggest sticking with the little 5mw ones as the goggles may not stop the frequency shifted output.

@WestCoastPicks 7 жыл бұрын

Is Mode any better than RP? I also live in the lower mainland.

@Spirit532 8 жыл бұрын

What power supply are you using? Also, joining the rest of the bunch in the comments - could we see some high speed LN2 action?

@tesla500 8 жыл бұрын

+Spirit Power supply was a dual 30V 3A bench supply in series mode for 60V.

@thekaiser4333 8 жыл бұрын

+tesla500 -- Orange has a SHORTER wavelength than red. But I don't think you would observe any relativistic effects here. Quantum effects at most.

@redloki_53 7 жыл бұрын

fascinating stuff.. may give a mini cameramodul a little dive while its recording,when its working you can use it for macros :)

@nielsdaemen 7 жыл бұрын

9:07 12:23 What you are seeing are tiny droplets of liquid water or: mist. water vapor/steam is invisible.

@SirBasslineJunkie 7 жыл бұрын

r u telling me vapin is a sham all along

@yucannthahvitt251 7 жыл бұрын

Yeah bruh, they just didn't want to call it "atomizing" because that's what perfume dispensers are called.

@Ezzell_ 7 жыл бұрын

i have not read all the comments...but in case any one is wondering why the leds got bright and volts went up when they were in the nitrogen...as conductors cool down..their resistance decreases.

@gianvitodifilippo 7 жыл бұрын

Actually, I believe the low temperature increases the semiconductor's energy gap. In other words you need more voltage - with a constant current - that is more energy, to overcome the potential barrier and let electrons combine with electron holes, and therefore to stimulate the emission of photons.

@BenBradford1 7 жыл бұрын

How about a little electric motor submerged in LN2 turning?

@korsanders3109 7 жыл бұрын

JayzTwoCentz tutorial on how to overclock your LED's

@HDXFH 8 жыл бұрын

Interesting idea

@compwiz00 6 жыл бұрын

I wonder if IR LEDs can become visible...

@Madarpok 8 жыл бұрын

overclock a Raspberry Pi with LN2?

@Coolkeys2009 8 жыл бұрын

Nitrogen in sealed containers high speed camera action. More semiconductor behavior at low temperatures(overclocking as others have said), superconductivity, any other weird interesting physics affects that can be achieved at those temperatures.

@SproutyPottedPlant 8 жыл бұрын

What about a speaker or would that all crack apart?

@JustinAlexanderBell 8 жыл бұрын

I wanna see some arcs through liquid nitrogen, or something silly like that.

@AlexanderChilds 7 жыл бұрын

The LEDs get brighter due to the lower resistance allowing more power to be pushed through. It's not that they change color, necessarily, it's more that they emit more of the original color/light being produced and brings the light out of balance with the specs of the LED (hence the white light turns blue, according to your explanation of blue LED covered by a yellow phosphor coating making white). I don't think red, green, or blue would change color, just get brighter. Good experiment though! I enjoyed watching.

@verdatum 8 жыл бұрын

I've been dewar shopping on and off for years now. Did you go with new or used? where did you buy it? would you recommend?

@tesla500 8 жыл бұрын

+verdatum I got mine used from ebay. I researched many common dewars found on ebay and this one seemed the best of what was available at the time, it has a very long holding time. There are many new dewars that seem reasonably priced from China, but I'm not sure how good those are. There are a lot of Union Carbide/Linde dewars available used relatively cheaply, but there's very little info on them. I was able to dig up a site that said they only have a 30-40 day holding time, so those are out of the question unless you use LN2 quite quickly. If you're searching, try other terms like "Nitrogen Tank" or "Semen Tank", these are often used for transporting semen for artificial insemination of farm animals. Other than that, probably go for something not too old as the vacuum will leak out (in? which way does vacuum leak?) over time and the holding time will get worse.

@verdatum 8 жыл бұрын

tesla500 Thanks for the detailed response! Yeah, the, uh, specimen, tanks seem to be one of the more common things to come up on ebay. I've mostly just been looking for one that is a reasonable volume, doesn't look too weatherbeaten, isn't ridiculously priced, and I've got the discretionary income lying around. Those just haven't synced up for me yet; but it's been an on and off search.

@calfeggs 6 жыл бұрын

The resistance increases the colder it gets, and decreases the hotter it gets.

@DrTune 8 жыл бұрын

When the LED gets brighter is it actually getting more efficient or is the current increasing? (i.e. did you use a current-limited PSU or a series resistor)

@GreenAppelPie 8 жыл бұрын

Getting much more efficient, brighter and the change in color indicates the energy it takes to 'cross the gap' is becoming less.

@tesla500 8 жыл бұрын

+Dr Tune The current was constant, but the voltage did rise by 30-40%, so the power was higher when it was cold.

@Ozziepeck11 8 жыл бұрын

+Dr Tune I presume its because its getting colder,lowering the resistance, meaning it can operate more efficiently and give out a brighter light. That would seem logical.

@girlsdrinkfeck 8 жыл бұрын

+tesla500 yh ,higher resistence right ? so needed to pul lmore volts

@GreenAppelPie 8 жыл бұрын

+Dr Tune After Your absolutely right, we can't come to provable findings until we know if the PS increased the voltage or if the Voltage drop across the LED dropped. Please repeat this experiment.

@myxbigxfruitxstickx 7 жыл бұрын

Hard drive in liquid nitrogen. Magnetic and SSD?

@testa9882 7 жыл бұрын

Nice safetygloves ;)

@GreenAppelPie 8 жыл бұрын

I'd like to see more LEDs, try UV, IR, blue, green, pink.

@brandonfowlkes4406 8 жыл бұрын

+GreenAppelPie an infrared LED might be cool to watch, because it might raise higher up into the red spectrum. However, an ultraviolet LED would be fairly boring, as we cannot see ultraviolet with our eyes (neither can *most* cameras) and the wavelength of the UV would just go farther into the UV spectrum. Near UV would be interesting though.

@GreenAppelPie 8 жыл бұрын

+Brandon Fowlkes I didn't assume anything would be directly visible, I'd just be interested in any current or voltage changes for the different wavelengths.

@2awesome292 7 жыл бұрын

Try it at like 1mA and go up untill it gets visible?

@marcferretti 4 жыл бұрын

Does this increase the efficiency of the led?

@DjResR 8 жыл бұрын

Usually heat causes the phosphor to lose effect.

@soski7200 3 жыл бұрын

New idea: RGB liquid nitrogen products.

@steven4601 8 жыл бұрын

What about an induction. I could imagen the PF getting really bad (which should indicate there are fewer losses) on a unloaded motor nearing fully reactive operation. (if the bearings don't start to bind up)

@steven4601 8 жыл бұрын

+steven4601 +motor.

@ruthosorio9913 7 жыл бұрын

Can you explain why a white LED produced a blue colour when submerged in the Nitrogen?

@shana_dmr 7 жыл бұрын

Because white LED is really a blue LED with yellow phosphor:)

@SeanBZA 8 жыл бұрын

Chill some steel bearing races and drop them to see if they shatter, or use some cast iron, which should be very brittle in lH2. Aluminium rod should also just snap like a straw, depending on the alloy used.

@samu5167 7 жыл бұрын

Ever wondered..how do you make it?

@jwuethrich8385 7 жыл бұрын

how much does LN cost per liter and where does one find it? being able to replace just the glass on an lcd/oled panel is a money maker but the newer panels and esp curved panels are a bitch. great thing is they embrittle with around the min temp of dry ice. ive tried dry ice but it wasnt ideal and i dont want to spend the 10k companies in china want for a ln circulating cold machine. hoping 300 bucks can get me a filled 3l tank of ln

@scottfranco1962 7 жыл бұрын

So you got the dewar on ebay, where did you purchase the nitrogen?

@tesla500 7 жыл бұрын

Air Liquide, a welding and industrial gas supplier, for about $2.50/liter

@Dosbomber 7 жыл бұрын

That's not a terrible price... I'll have to look into a dour jar. I have a few experiments I'd like to try out. LN can be used to make some amazing ice cream. :)

@TrollFaceTheMan 5 жыл бұрын

You need to use clear LEDs to see color changes.

@shazizz 8 жыл бұрын

Very interesting.

@sc0tte1-416 8 жыл бұрын

How does the liquid nitrogen evaporate if there's a cap on the container?

@brandonfowlkes4406 8 жыл бұрын

+sc0tte1 The container doesn't have a "cap" per say, it's more like a piece of Styrofoam that sits on top to provide more thermal insulation. This allows the expanding gas to escape, otherwise there would be pressure inside of the container that would need to be vented every time you opened it anyways, which defeats the purpose of even sealing it. The reason that liquid nitrogen does this, is that at room temperature, nitrogen is a gas. Nitrogen has to be cooled down in order to become a liquid. When the liquid nitrogen warms up, it boils just as water would.

@uTube486 8 жыл бұрын

That was great..Thanks

@Kyrazlan 7 жыл бұрын

expecting a colored lens to change color :/ That doesn't make sense. Try it with a RGB clear lens LED

@TecKonstantin 8 жыл бұрын

You should try SMD LEDs in my experience they work quite good for showing it. Somethings else to mention, at low temperature u get an increase of the band Gap so the wave length gets lower. But if u try out a green one in it gets orange, that would be the wrong way around. The explanation it a bit complicated but if u are interested i can try to explain it. Just try some SMD LEDs if u have different types, lasers could be also interesting, but don't put something in N2 u don't mind destroying. Have fun, u properly will have

@wudude3545 8 жыл бұрын

The voltage/brightness increased because the liquid nitrogen lowered the resistance of the wire

@unclebubba1872 7 жыл бұрын

How about dropping in some disposable lighters? Of course, in a safe environment. There are also a number of foods that can be quick frozen and are completely safe to eat immediately afterwards. I'll leave the selection to you. New subscriber here. :-)

@CauseImYourFat 7 жыл бұрын

this guy gonna make explosive lol

@stefantrethan 8 жыл бұрын

I think you might have gone slightly outside the specified operating temperature range there, better ask the chinese vendor if negative 195 C is still OK ;-) Crazy that the silicone would shatter like that, maybe throw some other silicone stuff in? I assume you saw the video Shahriar made? He got nice colour changes. Does anything interesting happen to magnetic materials? Ferrite maybe? What about capacitors?

@paulstubbs7678 7 жыл бұрын

How about trying it with a laser diode.

@JustAGuy93-G 7 жыл бұрын

Would it not become brighter due to the copper becoming superconductive?

@SilvaDreams 7 жыл бұрын

Correct-ish, the conductivity increases as the temperature drops as there is less resistance. It didn't change color though because the LEDs weren't actually orange/red just the plastic casing around them were.

@Kycilak 7 жыл бұрын

The conductivity sure rises, but for superconductivity of metal one needs temperatures in units of K.