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| - Single Molecule Study of Perylene Orange Photobleaching in Thin Sol−Gel Films
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| - The paper reports on photobleaching mechanisms of perylene orange embedded in thin sol−gel films, derivedfrom single molecule studies. The experimental configuration uses wide-field illumination and one photonexcitation of the molecules. Measurements have been performed both at ambient conditions and under vacuumin order to get information on the influence of oxygen on photobleaching in such porous samples. We havealso recorded the evolution of photobleaching with respect to the excitation intensity. The results demonstratethat photobleaching from excited states higher than the first singlet and triplet states has a nonnegligiblecontribution as soon as the excitation energy exceeds a few hundred W/cm2 and that this process is favoredin the presence of air. The study also demonstrates that perylene orange in sol−gel films is not a very efficientemitter but that photobleaching can be slow, which explains the interest for perylene orange as a good candidateto produce long lifetime solid-state lasers when embedded in monoliths of sol−gel.
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