Instructables
I think the hardest part about this instructable is spelling the word, "phosphorescent".  Thankfully the word GITD works just as well.  GITD is an acronym that stands for Glow In The Dark, and if you're familiar with anything Glow-In-The-Dark, then you know what phosphorescence is all about.  Basically there are certain materials which can absorb light, and then re-emit light slowly. 

Typically the re-emitted light is not the same color as the absorbed light, and Step 6 has some pictures, and explanation, of how that works.  But it doesn't matter if you slept through Quantum Mechanics, or even if you never had to take that class in the first place.  For this 'ible, it is enough to know the color of the absorbed light is blue, provided by a blue LED, and the color of the re-emitted light from the GITD material is green.  Visually the effect is very pretty.  Especially if you like the colors blue and green.

Aside from the underlying physics, and using big words like "phosphorescent", the next hardest part is actually finding phosphorescent (aka GITD) material, in the form of a flat sheet big enough to doodle on.  The best thing I found was this:  glow-in-the-dark printer paper.  Yes, they actually make GITD printer paper.  However there's no monger who sells it near where I live, so I had to buy it from an online retailer.  There's more about sources for GITD paper in Step 4.

Another trick is fitting a blue LED into the tip of the body of what used to be a ballpoint pen.  As an added complication I want the LED to turn on only when it is pressed against the pad.  That way it "marks" in the same manner as a pen or pencil, which marks only when pressed against the paper. If the LED is always on, I get an effect that is more like spray-paint, and that isn't the effect I want.

Another feature I want is for this contraption to be powered from a single AA battery.  To facilitate this,  I hack apart a cheap single-cell LED flashlight, and pull out its little magic LED-driver module, and then insert said module into my circuit.  See Steps 8, 10 and 11, for more on the magic LED-driver module.

When I put all these elements together:  GITD sheet, plus clipboard, plus page protector,plus blue LED, plus hacked LED driver module, plus pressure actuated switch...  the result is the Phosphorescent Notepad

It's a toy that I can use to draw doodles in the dark.  And it's great fun at parties! Particularly those parties that happen at night.

The last feature/flaw:  Drawings on the Phosphorescent Notepad erase themselves!

Given a few minutes the GITD material fades back into equilibrium with the ambient light/darkness.  The drawings don't last, unless I take a picture of them, and that is somewhat tricky because it must be done in low light.  A picture of a few "saved" doodles are attached to this Intro, and Step 13 which explains the trick to taking these pictures.   (Note:  If the camera flash goes off, the resulting flood of white light obliterates the drawing.  Thus, pictures of phosphorescent doodles must be taken with the camera's flash function turned off.)




 
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Nyxius2 years ago
If it were TRUE UV you would not be able to see it. It is more likely VH Violet (aka Black-light). Actual Ultraviolet is energetic enough to break carbon bonds, thus sunburn. Black-light is energetic enough to stimulate secondary emissions, but not energetic enough to cause wide-scale damage. That and 15 mWatts of power isn't going to cause anywhere near a dangerous level of damage to you eyes. You eyes receive orders of magnitudes more damage just by stepping out side, from reflected UV in sunlight. On average over 1400 watts/meter of sunlight bounce off the ground, and your eyes can handle the damage from that, so I think you're safe.
Nyxius2 years ago
IF you check NurdRage on YouTube, she shows how you can make the paper yourself. (Ok, not the paper, but the dye used to make the paper)
Andriffic3 years ago
I thought of this and painted a small plywood board with glow in the dark paint, and I have a blue laser. I was going to make an ible, but you beat me too it! :-) Anyways, a blue laser is concentrated UV (blacklight) light, so it does glow very bright. I put a tiny foam circle on the end of my laser so I can directly touch it to the fairly delicate board when drawing. It's fun! Also, I haven't tried it yet, but you can take a shadow picture of yourself with a camera flash. Seriously, get a $6.00 blue laser off ebay, they're cool!
bonnie133 years ago
Very creative and original idea. This project required a decent amount of technical knowledge and re-engineering.

Hope to see more
husamwadi3 years ago
Very cool!

Did you know if you use a blue laser the phosphorus will glow 10X brighter, and you can draw from a distance?
Jack A Lopez (author)  husamwadi3 years ago
I don't have a blue laser, but that would be something fun to try! Although, I think I've seen it done, not IRL, but in this 'ible:
http://www.instructables.com/id/DIY-glow-in-the-dark-frame/