Fluorescence means emitting light after absorbing it- higher fluorescence means that less energy is lost.

Fluorescent lightbulbs drop ultraviolet light down to visible light typically via a phosphor coating. White LEDs are also often phosphor (or similar) based.

Note that in neither of these cases is the phosphor considered a "dye". I suspect that any application of a fluorescent dye on the LED itself would still cause a fairly significant luminosity loss and buildup of heat compared to simply coloring the plastic or glass enclosure that the white LEDs are built into.

I am not a materials scientist or engineer, just a person who likes to wildly speculate on the internet when I don't get enough sleep.

> I am not a materials scientist or engineer, just a person who likes to wildly speculate on the internet when I don't get enough sleep.

I remember a series of science fiction stories where the protagonist would have some problem to solve, get wildly drunk and... the next morning there would be some weird device in his living room. It was the solution, but he would have to untangle what his drunk self came up with.

EDIT: Robots Have No Tails by Henry Kuttner

If you replace wildly drunk with insomnia, then I have to say that that sounds all too familiar :) Thanks for the recommendation!

one note: it is NOT hugo/nebula material, more like old-school pulp scifi. :)