The Crystal that Glows for Hours after Exposure to Sunlight; How this Occurs

There is a crystal which upon exposure to sunlight will glow in the dark for hours. This occurs via a highly unusual compound, with the reaction being triggered in part by a rare earth element. This video will discuss how phosphorescence occurs, and how certain ions can substitute other atoms in crystal structures.

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Sources/Citations:
[1] Ailioaie, Laura & Litscher, Gerhard. (2020). Molecular and Cellular Mechanisms of Arthritis in Children and Adults: New Perspectives on Applied Photobiomodulation. International journal of molecular sciences. 21. 10.3390/ijms21186565., CC BY 4.0
[2] Wikipedia, https://en.wikipedia.org/wiki/Ionic_r..., CC BY SA 3.0

0:00 A Glowing Crystal
0:24 Strontium Aluminate
1:56 Light Wavelengths
2:18 Fluorescence
2:55 Phosphorescence
4:08 Atom Replacement