Luminescent centers in nanolayers of LiF crystals with embedded silver ions

Abstract

Abstract. The paper presents the results of studies of luminescent centers induced by irradiation of LiF crystals with flow of silver ions of a fluence varying in a range of 2×10 13 -5×10 17 ions/cm 2 and energy about of 150 keV. Two bands with maxima at 250 nm and 420 nm in the absorption spectra of the exposed crystals were observed. The former was due to the absorption of F colour centers and the latter consisted of F 2 (F 3 + ) colour centers band and a plasmon resonance band arose due to the embedded silver ions. The peak of the latter remained stable after annealing the sample at 400 0 C unlike the colour centers bands. The luminescence spectra of the crystals under excitation with a laser irradiation of 375 nm wavelength showed a band with a peak at 450 nm along with the bands with peaks at 530 and 680 nm corresponding to F 3 + and F 2 colour centers, respectively. The peak of the former reached saturation, while the peaks of the colour centers bands increased with ion fluence increasing. These results show that subnanometre sized metal clusters Ag(n+) (n=3-6) are responsible for the observed luminescence, while the Ag particles of a nanometer scale are not luminescent.

Optical absorption of radiation defects in alkali halide crystals implanted magnesium and silver ions

“…5). Similar bands due to the implantation of silver ions were observed in [20]. The wavelengths of the maxima of the LSPR bands of Ag nanoparticles in the matrices studied by us are given in Table 2.…”