3 ms·
Yes, I meant that the upconverting fluorescence was unlikely to change the medium, but as you say, the blue light of course must.
by impossiblefork 5y ago
Yes, I meant that the upconverting fluorescence was unlikely to change the medium, but as you say, the blue light of course must.
- ncmncm 5y agoOK, yes. They have particles floating loose, with two different chemicals encapsulated in silica, that process the light, and end up bound into the hardened resin. One chemical absorbs red light, and delivers "excitons" to the other where they become "annihilation exciton triplets". If a second one of those gets in before the first decays, the two may "annihilate" and a blue photon shoots out. This all happens in the electron clouds surrounding the molecules, without otherwise affecting them, or anything outside until that blue photon shoots out. The red light absorbed to make the excitons leaves a bit of heat, but not much. It doesn't say whether the excitons that don't annihilate re-emit a red photon, or just devolve to heat; probably the latter. A clear majority of the red light is not captured, and spreads out beyond the focal point. Truly we live in a time of magic.