Re: Excitation and Emission Spectrum


raconte@xxxxxxxxxxx wrote:
> Attila the Bum wrote:
> > Blue shifts come from two-photon absorptions,
> > hence their "weak" (low probability) nature?
>
> Right, that's more or less what I meant. :) Remember, lab monkey, not
> Ph.D physicist.
> >
> > Got an example/published report?
> >
>
> No, but there are also phosphor screens manufactured (for example by
> Kodak) as replacements for x-ray film. If the phospors are exposed to
> x-rays or gamma rays, they become "sensitized". Red laser light causes
> a blue emission of the sensitized areas. The screen is reusable, just
> "erase" with blue light.

Just came across anti-Stokes phosphor while searching for somehing
else; this phosphor converts IR into green light. "YF3 host doped with
Yb3+ as a sensitizer and Er3+ as an activator can convert incident IR
radiation into green luminescence"

See, if interested:
http://www.radiochemistry.org/periodictable/la_series/L9.html

.

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