Ultraviolet LED with phosphor paint

[LimaAlphaPapaSierra]

Your drum scanner idea was how the first wire photo systems worked! AM modulating a tone with a photoresistor scanning an image and sending it down a phone line to a lamp scanning over photosensitive paper wrapped around a drum synchronized with the transmitter...

[jayandersons]

i was looking for the most effishant way to lite up phospher to improve lighting im hering of blue lasers being more effishent then led

[wbeaty]

@jayandersons Yep, violet 400nM lasers used in blu-ray work well. They're better than blue-colored 445nM lasers from Casio projector.

[jayandersons]

looking for much brighter like laser on yellow phophus

[wbeaty]

@jayandersons Just buy a violet laser pointer on eBay. The violet ones can charge up your glow-paint. And they're WAY brighter than violet LEDs.

[ken25taylor]

very cool, I love using a photo flash to power up glow in the dark stuff

[PandawdyBob]

crayola totally stole this idea

[demolishunDOTcom]

I know it is on the opposite end of the spectrum, but have you tried infrared? I am looking for something that will respond to an infrared laser.

[wbeaty]

@demolishunDOTcom that red orange IR phosphor does it. Expensive stuff. Radio shack sold IR detector cards with a small spot of that phosphor. You charge it up with blue light, then it glows orange when IR hits it.

[demolishunDOTcom]

@wbeaty

Yeah, I would imagine. It seems upconversion materials are pretty rare. It takes more than one photon to produce a single higher energy photon. However, I wonder if one can add energy to a photon by hitting/effecting it with a charge from an electron. That is probably even more exotic. At any rate, it is fun to think about! Thanks for getting back to me.

[bojangles465]

i did this with blacklight on my walls with glowing halloween stuff

[mousaey]

You could make a seismograph!

[039dalekmoore2007]

I am about to start a Slow scan television using your idea of a fax machine type system using glow paint ....hope the paint i have works

[ThisSkyermusic]

I agree with last post. Underground technology for the holocaust

[iamamaggot666]

i think you should try that thing you suggested at the end...

cuz i dont fully understand:P lol

[jfurman47]

response to teazer999999 : it's necessary to expose the am241 since the alpha particles are blocked by most solid barriers, and even a few cm. in air. In a sample of two different smoke alarms obtained from thrift stores, the am241 is mounted in a metal button that's riveted inside the shield can. I found this button may be removed without touching the actual am241 which is mounted in a depression. The plastic sheet is from a cd case; glow in the dark paint may be scarce so close to halloween.

[sevyn7up]

if you have kids they must think your so cool

[jfurman47]

I've used glow in the dark acrylic paint from a craft store chain to make a spinthariscope using the mounted piece of AM241 removed from an old smoke detector. I stuck the mounted AM241 on the end of a long screw mated to a threaded spacer in order to roughly estimate the range of the alpha emissions in air. The thin paint coating on a clear plastic sheet faces the alpha source. You must have your eyes dark adapted; the painted screen must be stored in darkness; use x10 linen tester to view.

[teazer999999]

@jfurman47 Dang, you got to make a video of that and post it. Sounds cool. Did you have to open the AM241 can to take out the source?

[wilfeatscheese]

i dropped my soldering iron on a fire evacuation sign and found out heat energy is stored also in such phosphorescent paint.

[LordDonutz]

I've seen a couple of your vids, pretty cool stuff sir.

[blastedude32]

Does the paint have to be wet for this to work?

[wbeaty]

> paint have to be wet

Nope, never tried wet paint.

[JamesMRaymond]

Am I right in thinking that this is almost how CRT screens work?

[nhojmabon]

@JamesMRaymond There is a similarity, CRT screens also use phosphors that turn energy into light (Separate red, blue and green phosphors packed closely together), however in CRT screens the energy that lights up the phosphors comes from high speed electrons that are shot into the phosphors, not from UV light like in this video. You could in principle make a CRT-like television that used a UV laser instead of electrons.

[futurestuntman]

have you done this yet? with the photo transistor? with the two cans rottating? if you have, could you let me know because i really wanna see it.

[wbeaty]

> have you done this yet?

Nope. It's a suggestion for Science Fair. You be first!

[sp4zzpp2]

what led did you take exactly?

[wbeaty]

> what led

One of those "ultraviolet" UV LED keychain flashlights, the kind people use to detect forged $20 bills. They're also called 400nM LEDs.

Violet or UV laser pointers now are very cheap on eBay. But blue ones don't work, you have to use the 400nM kind.

[odv000]

nice!

TV without vacuum

[intFILMDESINING]

Is this real.. ?

[alwinovich]

yeah

[wbeaty]

> real.. ?

It's just glow-in-the-dark stuff, yellow-green phosphorescent paint. Ask for glow-in-dark paint at a large art store. (NOT ultraviolet fluorescent paint, it has to be zinc sulfide glow-in-dark phosphorescent type.)

The violet frequencies of light will charge up the glow-paint. That's why a red or green light bulb won't work.

[hambone950]

i need help i sound dumb but w.e what is diffrence and why would you want UV compared to regular LED?

[wbeaty]

Green LEDs won't charge up the phosphorescent paint. Neither will blue LEDs. You need violet ones.

[PistonHonda319]

What would happen with a laser? You said the Phos-paint "stored" the light. I would think with a laser the light would be really focused.

unless it only works with certain wavelengths of light. (hence the UV LED) but you said you could charge it with incandescent light?

Sorry if im making a stupid comment, i dont understand much about it.

Wikipediaing now.

[wbeaty]

Yep, it works well with a 405nM violet laser pulled from a dead blue-ray. The LEDs and that laser aren't really UV, that's just marketing hype. It's visible violet light. Blue and violet light can cause fluorescence. The edge of actual invisible UV starts farther out, around 380nM.

[PistonHonda319]

by nM you mean the actual length of the light wave?

i never put that together - that "wave lengths" of light are only visable in a particular spectrum due to their size.

i seriously learn and understand more by watching/reading youtube/wikipedia than i did in highschool

Because its INTERESTING (TO ANY TEACHER READING THIS).

[crazyfreakypunk]

CAn you make a vid of you placing it in the microwave?

[ishotthesherifswife]

with your doc.who sonic screwdriver, you make things go GREEN

[saivert]

this also works on a CRT TV or monitor (tube) if you still got one in this LCD era. It doesn't glow as bright as this phosfor paint (glow in dark paint) but you can still see it if you have a really dark room.

[adamthecg]

way cool, im going 2 make one!

[arkhamasylum2k9]

YOUR CUTIE

LOL

[david1991rules4life]

UV...wait; won't that give you cancer?

[hidnshadows]

wouldn't the nuker spark? or get ruined? ALSO, what happens when you put dry ice in A a fire B the nuker C in various cleaning agents?

[MRoSCONEZ]

fun =]

A) in fire it just evaporates really fast

B) i have no clue what a nuker is

C) well in soap and stuff like that when you pop the bubbles fog comes out and i think the other stuff wuld just get really really cold and u can make ice cream with it =D

[hidnshadows]

B microwave.

[MRoSCONEZ]

oooh uuh im not sure wat wuld happen in tht case

[mshekleton]

that's so cool

[doubaz]

of course he has cats lol

[NullPoint84]

the applications are endless. thx

[bestSVMS]

find a uv laser and you could paint from far away

[gaussman08]

and much more intensive

[chaumas]

So could you get an actual 3D map of the hot spots in a microwave by nuking a translucent suspension of zinc sulfide?

[Scientiaful]

Are you Lenin?

[Nicaveli]

that cracked me up Scientiaful, good post

[Robskeetskeet]

is this something similar to why I switch my TV off I can see it glowing slightly for a while afterwards?

[hidnshadows]

flourescent powder, the powder that gets everywhere if you crack on of the EEficient bulbs open, glows when it gets near high voltage, and stays glowing for a little while.

[NapoleonLouverture]

if you did that, I hope you were wearing gloves and mask, mercury poisoning occurs when you crack one of these open...

[imboor3d]

i fucking hate youtubes adds, screw google

[UnderManiac]

Use an electron gun to draw an image.  Pulsing it and using magnets to move the electrons would cause an image to appear. To get an electron gun with magnets, smash a TV tube (or CRT).

However, the image would only be green and would be very blurry for moving images.

[UnderManiac]

Hey, making my underwear glow bright while hanging out at spenser's gifts. Now that's a great idea. Thanks.

[MrBIGBOY762]

???

[Kafrotox]

It works like a radar screen.

[oisiaa]

You are so great. I love how you conceive the idea of making your own fax machine based on the materials in front of you.

[3point14Films]

What type and what quanity of UV LEDs would I need to create my own garden?With 2012 nearing I want to plan my fallout shelter as best as I can.

[blahdob]

HEY GUYZ ges wat SUM1 SED WORLD ENDZ IN 2012 I FINK I SHUD SPEND ALL MY MUNY NOW

[CrazyMonkey124]

Yeah, send it to me....

[CrazyMonkey124]

I hope a plan falls on your house and you get locked in your shelter for 30 years. (find my reference and get a cookie.)

[lawwid228]

Its a "Blast from the Past" reference. now where the hell is my cookie.

[CrazyMonkey124]

*gives cookie* Hope you can handle arsenic...

[jshaw6000]

I got a pack of 20 UV leds from dealextreme for $3. They also sell a UV led flashlight. I prefer to build my own though.

Where did you get the phosphorescent paint from?

[wbeaty]

> Where did you get the phosphorescent paint from?

An arts/crafts store with silkscreen printing inks.

[sassharkster]

Your idea at the end is very neat, but, wouldn't the light "dim out" before the drawing was completed?

It'd be cool to do it on with a regular marker/paper though! Copy machine :D

[wbeaty]

It lasts five or ten minutes in a fully dark room.  Make a rotating arm with 100 close-spaced LEDs

[mikahgiacchetti]

fluorescent is uv light reactive...

phosphorescent is glow in the dark

get your terms right pls.

[remi009340]

ya 5 stars for the cat on his lap!

[TheAwkwardBanana]

So cool!

[saintaureus]

This is a great demonstration--gives me an idea for a monochromatic projection television using this paint and a computer-controlled laser.

[therealpd12001]

I so want to do an animation using that stuff (^___^)

[csfreak50]

i'd be using that all night when its dark, and when i'm loaded

[Saviour86]

Good idea, a possible idea would be to paint all the insides of the case, then install a UV LED light with a timer to turn on and off and constantly color the whole thing up.

[siriusblack9999]

TV remote isn't UV, it's infrared, the fact is, the cameras are converting the invisible light(UV and IR into visible(purple-white) light

[ubuntututorials]

It's blue because UV's near the top of the visible spectrum. The white is probably caused because the camera is being overexposed to the IR light - it's very sensitive to this.

[saintaureus]

Naked CCDs will pick up a range of wavelengths including infrared and ultraviolet. That's why good digital cameras have filters for these invisible bands.

[caesarvegastube]

IS EX-CIA or KGB???

[Patchumz]

Subscribed ^_^ Love all these nerdy science-y type videos.

[Dragracelover22]

Thats Awesome!

[Trublhappn]

... ---... stop ...---... stop ...---... stop

if that means anything more than gibberish to you, congratz, you MIGHT survive without modern technologoy

[dudeimamazingbeef]

lol

[Trublhappn]

aww someone rated me down on my comment. Which is funny o.O... cause of what it means. Give ya a hint, it's morse code :P

[jake0d0magic]

great vid! ( 1:48 looked like something dirty=P)

[cherilyndria]

This video makes me want to grafiti things with glow in the dark paint, lol!

[fizzpopbangcrack]

dude, go patent it; its awesome, and i would buy one lol.

[theiceman259]

actually the same basic principle is in a fluorescent lamp

[mdemenok]

Whoa, the "fax machine" idea is pretty awesome. If I was crafty and could program a LED lettering controller, I'd make one. All I would need to do is get a LED controller for those single-letter LED displays, create a bigger version of that letter with UV LEDs and a cardboard hood to make it sharper, put it above a rolling sheet of paper/plastic painted with glowing paint and then flash the right LEDs at the right time. Would look really cool.

[livedandletdie]

UV BLUE GREEN RED IR and that it for seeable light. So red won't work

-380nm Uv -495nm blue -570nm green

-750nm red +750nm Ir. The lower length th higher strength blue has between 668 to 789 THz while red only got about 404 to 484THz. nm=nanometers Thz=Tera Hertz.

[lisaemel]

dude this guy is a freakin genious. HAHAHA i love it.

[IVViLL]

and you are not.

[BMM51]

Will it work with red laser?

[deadly990]

no. red lasers wavelength carries less energy per second than the larger frequencies so it would store energy much slower. (i think wbeaty can correct me if he wants)

[soklot]

nice vid.

[GraphicsLizard]

I love your vids. Especially the holograms I wan to try those.

[gallardo228]

This is in I think the Calgary, AB ,Canada "Telus World of Science" and Science centre for short

[treonsverdery]

OMG what I really want to see on youtube is an optical computer made from an overhead fan plus the reflective surface of a spoon Depending what part of the spoon you are looking at the rotation images seem to have different frequency

That kind of suggests that a spoon reflecting a spoon reflecting a fan could create additive frequencies n do computations watch?v=leI7sfmipuI

[treonsverdery]

That is super awesome to find out that phosphorescence goes way up just with touch temperature

I'm trying to think of a chemical to put on roofs that Reflects more IR durring warm summer than cool winter thus saving energy

[CakesPix]

ok trying again. LOL.

a deciduous vine? so it would lose it's leaves in the winter.

[sleepydood]

I get where you're going with the toucans, but I think it'd be awfully hard to paint and keep them still enough for this to work! XD Sorry - had to go there. Cool vid! Thanks!

[wbeaty]

> I think it'd be awfully hard to paint and keep them still enough

Insert flourescent jellyfish genes?

:)

[mnc2fan]

Now thats pretty cool. Similar to the way a cathode ray tube tv creates images. Except the cathode ray is way more complex, but uses a phosphorus material (or screen) to hold the different wave-lenghts of light hitting it. The way the violet light energy is stored in the phosphorus paint.

[ThePCpoet]

nice vid, I wonder what different uv nm lengths would do to it.

[randomlugia]

Any wavelenght lower than the color of the GITH. Since it's green here, you could probably do it with anything less than 510nm.

[wbeaty]

> Any wavelenght lower than the color of the GITH

Good point. But for practicality, a 400nM violet LED gives an enormous effect, while the results from typical superbright blue LEDs is barely visible.

[supergsx]

Try it with a blu ray.

[pssyco123]

you are so cool :) i mean it you are very cool :)

[mivec4g64]

that morse code said im a gay fag

[jaamez1]

wow man id love to see it tossed in the micro-wave if it turns 3rd

[bamboo4tameshigiri]

OMG I know how to build my next trip toy now.

[AllRoundMangaFan]

lol thats tight but you must have been bored :P

[Nrich46]

ok is Zinc-Sulfide phosorescent? and i think you should shine your UV LED through a magnifing glass on to the paint.

[quiteobserver]

cool but it glows shortly

[54spiritedwill54]

That's awesome!!

[aleinXinsect]

I think you could use just a regular laser beam and get the same effect

[ANormalGuy]

yeah

he said you dont need LED ultra violet stuff

[crapkillerz]

Your so cool.

[hernanortiz]

wbeaty you have been a nice teacher to me

I hope one day i will meet you. for starts a friend of mine told me where you buy the beer can you melted in another experiment.

keep going with science my friend

hernan ortiz

[BlueMoon3113]

Haha! UV Flashlight + Glow in the dark phosphor paint= A great/somewhat dangerous gift for your kids. =D

[wbeaty]

It's actually just violet light and not UV. It's all just advertising hype. If it was real UV, it would be invisible. And a real UV flashlight would be like germicidal merc vapor lamps, and have government warnings, and not be sold to the public. But even violet light can cause cornea irritation if you stick the LED against your eye for many seconds.

[deviouslife]

Well, this isn't the type of Ultraviolet you're thinking of. It's not "ultraviolet", but its pretty close, ands has a lot of the same effects as ultraviolet, seeing as they are closer to the same properties as each other than red or green would be.

[xNightwraith]

what really happens if you shine the uv in ur eyes?

[DAKODA65]

um it hurts i have one but yeah it hurts

[INTRUDERVTWIN]

Heah. Great video! This would be great for kids. My question is. If kids were playing with this and shine it in their eyes accidently can it damage their eyes?

[PhDcuXx]

no, it is not dangerous. It is not a laser.

[wbeaty]

It's a violet light (not actually UV.) Also, it's not as bright as the UV tube lamps sold for fluorescent posters (like Spencer Gifts.)

[DAKODA65]

can you still see cat urine?

[englsprogeny]

So cool!

[RoadRunnerLaser]

I have a 405nm (BluRay) laser which performs well for this function. I think I'll hunt out some of that 'paint'. I've been looking for a reasonably priced source.

[DJGOODWEED]

if you had a low power ultra violet laser doing geometric patterns though mirrors, like a rave, in a room full of that paint.. it would be the craziest shit ever, you'd have to think you were tripping

[electroluminescent]

phosphors is ZnS:Cu ,cool,

[Dragonstud]

i made my self a uv torch like yours for checking floresance in corals ....

[wbeaty]

It's just "UV Fluorescent" paint. Yellow-green is pretty bright. So it "hot pink" fluorescent paint.

[jroy777]

The 2 can idea is actually pretty cool sounding. Were you doing to try that sometime?

[Lorddias]

You sound just like one of my old instructors from College..

[itsmeankit]

hey great vid, why did u put this link on the ebay feedback for the guy selling leds? did u even use the leds from the store to do this project? if you bought the single leds from teh store(used in cars) how do they work because i want to light a lot of my car with them and i dont know if they will work well.

[wbeaty]

What ebay link? I highly recommend that you DON'T buy UV LEDS from ebay under any circumstances. Those people are dishonest.

[itsmeankit]

o i guess someone took the liberty to post the link of this video in the comment for buying uv's from a ebay seller. anyways good vid.

[qwertypgd9991]

Thanks! That's awesome!!

[niekas]

Thanks for the video. That was pretty cool.

Zinc based glow paint is not very effective. Next time try getting some of the strontium or europium based paints. They are more expensive, but they glow at least 10x brighter and the glow lasts up to 16 hours depending on the color.

[wbeaty]

Good point. I have some strontium aluminate europium. It glows for wa longer than ZnS, but it's much dimmer when charged up by 400nM violet LEDs. I doubt that it would even show up on camera. Having shorter wavelength blue glow, it probably requires much shorter wavelengths than 400nM in order to "charge up."

[Sedokun]

Try to add in paint some phosphore for fluorescent lamp, it catches uv well. There is spectra chart on wiki (Fluorescent lamp article).

[Sedokun]

Oh. That was about europium based paint.

[MatthewKeehan]

that was damn cool! thanks!!

[pjdude]

That is really cool, thanks :-) I will try that.

[Russoft]

cool stuff!

[kyromaster]

that was really interesting, thank you!

I'm going to order my UV led or UV laser diode to try that!!!

Next step will be to build a computer modulated X-Y scanning UV Laser stage....and paint a big board with this phosphors