Regular "glow in the dark" material can give you some extra light with heat. if heated already didcharged it will glow for some time again, like, it lets some trapped light to get out faster.
I remember when I was 14 my friend and I found some phosphorescent fungus on a stick when hiking at night. It glowed for hours. It was the coolest thing we had ever seen.
Your are sometimes soo close from research level that maybe you'll discover something new one day! You don't have enhanced devices but you manage to do workings things soo fast, even complex sometimes and you try a large diversity of subjects. Is it your own subjects each time? You're the only one that don't do what others make, you're a real source of knowledge, especially because you know the theory behind things.
@BUST ON ME NIBBA that’s like like like saying really good teachers aren’t doing anything special because the things they’re teaching are already known. Because it is. Also, what chain of events lead to you thinking using that username was a good idea?
What happens when you heat up a phosphorescent material. Does it glow for less time? It seems there's only one thing: phosphorescence with varying times of glow dependant on the materials temperature. Fluorescence is just one form of phosphorescence.
I can tell you from printing a fluorescent plastic that you can heat it too much and ruin the fluorescent effect while still maintaining the bright color in ordinary room light. If I print that stuff at 210C it is incredibly bright flourescent, even a near-uv light sets it off like a light bulb. Take it just 10C higher and no glow, even right on top of the uv source. Definitely some chemistry changing as a result of temperature.
They use lasers to cool atoms down to almost absolute zero, you could call that cold light. I don't think that will work on a human scale since it works similar to noise cancelation, imagine trying to cancel all waves in the individual atoms on the skin of your body.
@@AndreVanKammen Yeah and also you need multiple lasers from different directions which our skin would block. Even if you could manage powering 10^24 lasers..
Bumping into other atoms has nothing to do with the energy levels of the electrons. It works by absorbing UV that bumps it up _two_ levels; then it falls back down one step at a time. What you are seeing in plastic has to do with _excitons_ which are a bound state of an electron and a hole. Molecular vibrations will indeed destabilize this, so it works better when colder.
This might be the best example of what makes your channel so great. You demonstrate some obscure phenomenons that under regular circumstances, are so uncommon or implausible, nobody talks about them or even considers them. Like ignoring friction in beginners classical mechanics, but to an extreme level. So this adds unnecessary obstacles in front of anyone trying to understand such physics concepts. Physics course put too much importance on what's useful, they discard most of what makes it logical, consistent, and true
I love this one. One of the cooler things you've shown on your channel. Sometimes your lack of safety gear for some experiments kills me a little inside though lol.
Everyone listen before putting the cap in Nitrogen i.e,The Normal Highlighter You can see that it Glows after the light is turned off. When you put video speed to 0.25X Speed BUT FOR A MILLISECOND IN 0.25 Seconds also
@@TheActionLab i love ur channel thanks for putting the effort into making ur videos just to entertain and impress us, wish you luck, you never fail to impress me and you are a great RU-vidr.
Note that the emission you are seeing is from molecules, not atoms. This adds the effect of vibrational and rotational excited states which are impacted by temperature.
I didn't have liquid nitrogen to experiment with but from my mom I did have an old powerful soviet flash. One which works from 220 AC and turns you completely blind when used in the dark. And I found out that many things exhibit similar behaviour. The effect lasts much shorter, somewhere around fraction second so in order to see it I closed my eyes as tight as possible stuck the flash to the object of interest, made a blast and immediately after that watched for the result. And the surface of the object where it contacted to the flash was noticeably glowing even though the effect lasted less than a second as I was saying. So it should be something like a triplet phosphorescence. Thanks for the info.
Whoa. That is profound. I heard of exotic lasers that have to be kept cold like that to function, but this demo showcases this to an extent I never dreamed of.
It's not a single photon taking years to escape. The emitted photon heats up the nearby material. The _energy_ diffuses slowly, using thermal convection, more radiation and absorption, and phonons. Hot things glow. So you see the hot surface.
This really helped me understand that when we see things in visible light, they're literally actually glowing, absorbing light and reflecting it out. Cooling these objects shows basically what is happening in super slow motion.
Most things just reflect light (bounce it off), fluorescence & phosphorescence are a different/special process. Although, even things that don't fluoresce or phosphoresce in the visible range typically still emit lower energy infrared radiation as a result of molecular vibration.
I remember when I was a kid, we've bought those glowing bracelets (basically thin, bend glowsticks, shaped like a ring) and someone told us that if they stop glowing, all we need to do is just freeze them overnight. I've never tried that because I've lost mine, but now I understand where this idea came from.
im interested but confused. as usual sometimes but always cool! thanks for taking your time to do research and give real information, and then setting up a video for it just so we can sit at home, or work, or play, and watch youm
I'm curious why the highlighter cap changed color to red when cooled. Is it because there are two compounds that give off photons, one green and one red, and somehow the green one is losing its higher energy state before the red one does?
At 7:16 you can see the the same spike of light happening when there's no cold object so I'm thinking the ultraviolet light bulb is giving off some lower frequency light and that's what's visible on the cold objects so maybe that has something to do with it
This makes me think of super conductors. We have to cool them to allow for the superconducting effects. Idk what if the process to make glow in the dark like on floresent materials could work for making room temp superconductors
Naw the two effects aren't really comparable, superconductivity happens from a substance getting cold enough that electrons can form Cooper pairs, to make higher transition temperatures for superconders you gotta make Cooper pair formation more favorable, but when making a glow in the dark substance you are trying to get electrons to absorb higher energy photons and release lower energy photons after a delay so to make a higher "transition temperature" glow in the dark material you're trying to find chemical compounds where the electron fields can form very metastable excited states. While both effects are very awesome and are affected by temperature they are very very different and we aren't even super sure about all the details about how superconductivity works yet so phosphorescence isn't a helpful model anyway lol
Another brilliant video! I’d love to see you demonstrate nonlinear optics where the emitted light is of a higher frequency, as in blue laser pointers where a crystal is bombarded with IR light and emits visible waves. I only barely know that it exists and don’t know how it works; you could probably translate it for your viewers!
Fascinating! Some basic research grants to be had... Also makes me consider bioluminescence, especially since many deep sea creatures exploit this chemistry at high pressure & low temps. Thank you for continuously experimenting!
the residual cold is putting a compressive effect on the matter which is many step changes slower time light .. the pre lighting then compressing the edge is pulling light out between change ratios. cool experiment. compression will emit light in relative ratio effect
When i was a kid and black lights and UV posters were really popular, i used to take a highlight marker and squeeze the ink in a glass bottle with water. like an old coke bottle, jones soda, or a sobe drink...then turn on the black lights and they looked like little toxic lamps haha
Amazing effect! I had no idea, but at the same time it makes sense that slowing it all down (i.e. cooling) would also slow the effect of fluorescence.. Broccoli !!! Try broccoli under UV.. it kinda fluoresces red/pink ish..
I have a bit of a critique for your title as this is cryogenically activated phosphorescence. The emission is induced by absorption of the UV light, not the temperature change which activates the photoelectronic pathways instead. Unlike triplet phosphorescence and fluorescence, the mechanism for persistence phosphorescence is poorly described even though it is well known within the spectroscopy community. The lack of a mechanistic description is mostly due to the complexity of the pathways. It is known that electrons and holes are trapped apart and slowly migrate back with the fast non-radiative decay pathways available at room temperature being inhibited by the low temperatures. It is interesting that the emissions appear to be mostly one colour suggesting that the recombination leading to emission is involving a limited number of phosphors (possibly only one). Enhanced triplet phosphorescence is very well understood and is due to exactly what you said, an inactivation of non-radiative decay pathways. It also makes some low energy states available for decay into which are usually inhibited by the systems thermal energy. It is also diagnostic of phosphorescence vs TADF (thermally activated delayed fluorescence). The relatively fast decay of the triplet phosphorescent bulb is likely due to the efficiency of the triplet emission pathway acting as a sink so that limited persistent phosphorescence could occur.
We cryogenically cool light sensors all the time, so the effect is understood, but materials are used which don't interfere with the measurements. Cool video, though I thought you were going to talk about super-cooling atoms using laser light.
I needa know, are you a teacher or a professor? because your very smart and i doubt someone with such brilliance would just do youtube with it and not have another job thats sciences.
Pretty cool experiment excuse the pun, I knew temperature changes how florescent things act but things that we do not consider florescent at normal temperatures I had no idea about
@just some guy tired of life I think that more heat means more agitation of atoms and molecules (electrons have little effect - because they vibrate and spin way faster - except if dramatic heat difference like several thousand of degree C°). The decay of fluo-phospho-rescence depends on the quenching due to other atoms shocks against the excited atom...in organic chemistry it is often dioxygen (or water containing O2) that reduces the fluorescence. It seems logical that if you reduce the amount of vibrations/moves of atoms and molecules...you strongly reduce the amount of inter-atomic-molecular shocks and thus you slow down the quenching/reduction of fluo-phospho-rescence...as a result decay last longer and is less intense. It is interesting to observe the emitting radius around the fluo yellow pen (like 15 cm) reduced when frozen (to about 2 cm)... so freezing reduces brightness a lot and extends brightime much more) One may conclude that at absolute zero °K... brighttime will tend to infinity and brightness to zero. Would be interesting to see the effect with a superfast camera... then you would see fluorescence the same way as when frozen. Also the stange orange glow of the yellow plastic pen and the longer glow for the yellow rope may/must be due to multicomponent system...with different fluorescers/phosphorescers with different decay time... I guess the experiment would be very interesting with a mix of different fluorescing/triplet state phoshorescing stuffs (like overlapping draw lines of fluomarkers or dried solution of various mixed fluo dyes) in super slowmo unfrozen and frozen... there should be various color changes as a function of decay times and brightness of each dye...some will extinguish faster and other slower with varous color additive effects. I also wonder how ruby would react being fluo flash pink fluorescent. PHZ (PHILOU Zrealone from Science Madness forum)
These demonstrations really were... SO COOL! Curious, you refer to them as "cryogenic" but wouldn't they be more "cryonic"? Is there a difference between the two? I could easily look it up but it would make it all the more awesome if the explanation came from you :D
You should try this with a few cubes of different material/density and paint a few spots on them with venta black and check. Maybe it lasts longer since it absorbs more energy. :)
Triplet phosphorescence is the reason why dye lasers cannot opperate truly continously. The dye must flow or the laser must operate pulsed. In practice the dye usally flows in both types, even pulsed lasers. The triplet state delay will not allow the dye to reach the upper lasing level.
Please, may you do it with rock or dust or sand? If it would work, it may means, that we can detect a dark items in space (meteorites, or so) by emitting a black light and watch for flickering of near objects :-D . Afaik, Space has a temp about 2 K, liquid nitrogen is much more hotter
That means for conductor objects and insulator objects when you put in freeze temperature with black light, so either it will show non-fluorescence, to fluorescence, to phosphorescence, so it is a range of holding the heat within which it can resist well to object so base on cold radiation of an object which insulator last longer so it resists heat well, so hot radiation resistor relative to cold radiation of an object, so when put in cold liquid, it last longer the cold light so it holds the heat of colder temperature, like a conductor that holds heat, so insulator holds heat, plastic hold the heat longer then it disappears. Well, it is a good to test for which is a conductor or insulator for resisting the cold and resisting the heat.
