Fluctuating fluorescence of single color centers in lithium fluoride crystals
Dresvyanskiy V. P. 1, Zilov S. A.1, Martynovich E. F.1
1Irkutsk Branch of the Institute of Laser Physics SB RAS, Irkutsk, Russia
Email: nadvp@list.ru, femto@bk.ru

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Single F2- and F3+- color centers in the LiF crystal were studied by confocal fluorescence microscopy. The time dependences of their fluorescence intensity were analyzed and statistically processed. Our studies show that, the F3+- color center, being photoexcited, is able enter the triplet state, while in ground (singlet) state it changes orientation with a frequency of 1.5-2 Hz at room temperature, due to reorientational diffusion, unlike the F2- center, which is reoriented only being in the triplet state. This subtype of rotational diffusion of the center does not lead to its translational diffusion. Keywords: fluorescence, spectroscopy, single color center, confocal microscopy.
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