Dyeing for excitement? Laser excitation of rhodamine 101 doped 2D hexagonally ordered SBA-15 mesostructured silica thin films results in anti-Stokes luminescence with high quantum efficiencies; the emitted light is higher in energy than the absorbed one (see picture). It is shown that this effect is attributed to an energy up-conversion that involves a direct single-photon absorption process from high-energy vibration–rotation levels of the ground singlet state S0 to one of the vibration–rotation levels of the first excited singlet state S1.
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Bartl et al. (2003) studied this question.
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