Sciencemadness Discussion Board

Glow in the dark beads

sarinox - 31-10-2024 at 09:59

Hello all,

Please examine the attached image of a bead. The left side shows the bead under ambient room lighting, while the right side captures it in a dark environment after UV exposure, demonstrating its photoluminescent properties. As observed, the bead emits visible light in darkness following UV excitation.

I have a few technical inquiries regarding this material:

1- Does anyone have insights into the specific photoluminescent compound or class of chemicals likely responsible for the light-emitting properties of this bead?

2- The bead material appears to resemble a thermoset polymer. but the link here: https://www.amazon.com/Misright-Necklace-Decoration-Birthday... says it is acrylic!

3- Would it be feasible to dissolve or chemically modify this bead material and subsequently reform it into a new shape using a mold? If so, any guidance on potential solvents or processes would be appreciated.


-Sarinox

photo_2024-10-31_21-01-01.jpg - 126kB

Sir_Gawain - 31-10-2024 at 13:09

The photoluminescence compound is probably strontium aluminate, or possibly zinc sulfide. If it is acrylic, it should dissolve in DCM.

Fulmen - 31-10-2024 at 13:18

Back in the day I bought phosphorescent powder from fishing supply stores. This can be added to clear epoxy or whatever castable polymer you prefer, there are many to choose from. I used it on boomerangs for nighttime throwing.

sarinox - 1-11-2024 at 00:22

Quote: Originally posted by Fulmen  
Back in the day I bought phosphorescent powder from fishing supply stores. This can be added to clear epoxy or whatever castable polymer you prefer, there are many to choose from. I used it on boomerangs for nighttime throwing.


Hi Fulmen, and thank you for your reply.

Do you happen to know what type of powder this might be? As far as I remember, I have not encountered such phosphorescent powder in any local fishing supply stores. I do have some phosphorescent acrylic paints, manufactured in China, though they appear to be of lower quality compared to the bead I shared. Specifically, the paints do not glow as brightly, and their light-emitting properties fade significantly faster.

sarinox - 1-11-2024 at 00:24

Quote: Originally posted by Sir_Gawain  
The photoluminescence compound is probably strontium aluminate, or possibly zinc sulfide. If it is acrylic, it should dissolve in DCM.


Hi Sir_Gawain, And thanks for your reply.

By DCM you mean Dichloromethane (Methylene Chloride) right?


Fulmen - 1-11-2024 at 00:44

No sorry, I have no data on it. IIRC I found it in the ice fishing supplies.

sarinox - 1-11-2024 at 03:28

Quote: Originally posted by Sir_Gawain  
The photoluminescence compound is probably strontium aluminate, or possibly zinc sulfide. If it is acrylic, it should dissolve in DCM.


After doing more research on YouTube, I think Strontium Aluminate compound and its variants will show lower rates of fading.