The Upconversion luminescence.
Is it possible to get the emission in UV region aftewr exciting the material by 600 or 650 nm laser?
I've never read about red to UV upconversion - maybe if you have enough high energetic excitation, Tm3+ or Er3+ will show this phenomenon...
Yes, this may be the case for several systems. For example, look at:
M.F. Joubert, S. Guy, S. Cuerq and P.A. Tanner, "Room-temperature blue upconverted luminescence via photon avalanche pumping in Cs2NaGdCl6:Tm". Journal of Luminescence, 75, 287-293, 1997.
C'est possible avec un système (terre rare )qui a (2 ou plus) transitions à 600ou 650nm (du niveau fondamental et excité) donc absorption à n photons possibles et qui peut émettre dans l’UV +incorporé (dopage) dans une matrice qui transmet bien dans l'UV. wwss
Photon upconversion (UC) is a process in which the sequential absorption of two or more photons leads to the emission of light at shorter wavelength than the excitation wavelength. It is an anti-Stokes type emission.
This paper reports on NIR to UV upconversion.
http://pubs.rsc.org/en/Content/ArticleLanding/2015/TC/C4TC02791D?utm_medium=email&utm_campaign=pub-TC-vol-3-issue-13&utm_source=toc-alert#!divAbstract
It is possible only at high capacity of radiation when the nonlinear response of the environment is possible.
yes, Haigui Yang, Zhenwen Dai, Zhiwei Sun. Upconversion luminescence and kinetics in Er3+:YAlO3 under 652.2 nm excitation. Journal of Luminescence, 2007, 124, 207
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