Tuesday, October 9, 2018

photochemistry - Do materials exist that absorb Visible light and emit Near InfraRed light?


I am thinking about the possibility of making a hat or other clothing item that might show up funny on cameras, as they are more sensitive to infrared light than human eyes. Therefore, I was wondering if there are any (non hazardous) materials that emit InfraRed light when they are exposed to visible light.



Do these exist, and would they be suited for this kind of application?




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periodic trends - Comparing radii in lithium, beryllium, magnesium, aluminium and sodium ions

Apparently the of last four, $\ce{Mg^2+}$ is closest in radius to $\ce{Li+}$. Is this true, and if so, why would a whole larger shell ($\ce{...