Deformation luminescence in gamma-irradiated alkali halides

Mechanoluminescence induced by elastic deformation of coloured alkali halide crystals using pressure steps

“…So far as the deformation at constant strain rate is concerned, the results reported for the dependence of ML intensity on strain at different strain rates indicate the increase of ML intensity for a given time t with the strain rate [34]. The ML intensity in the plastic region has been found to increase linearly with the strain rate [34,[40][41][42][43]. These results are in accordance with Eq.…”

Effect of Mechanical Factors on Fractoluminescence of KCl:Ca2+ Crystals after X-Ray Irradiation at Room Temperature

“…The spectrum in the wavelength range from 280 to 580 nm was estimated from the magnitude of the FL intensity through a number of Figure 9 shows a typical result of the emission spectrum of FL from KCl : Ca 2+ after X-ray irradiation for 10 min. Spectral sensitivity is corrected by changing the spectral response of the photomultiplier on the basis of the data from Hamamatsu Photonics Co. A prominent peak at 400 nm is found to be in agreement with that of deformation luminescence reported by Hagihara et al [3]. They attributed the emission band to a center formed after recombination of the F 2 center and the V 2 center, which is a typical hole center [9].…”

“…They attributed the emission band to a center formed after recombination of the F 2 center and the V 2 center, which is a typical hole center [9]. They have reported that an interaction of dislocations with the F center may release a free electron which may be trapped by another F center and form a F 2 center [3].…”

“…The DL is attributed to the interaction of dislocations with color centers [2]. Recently, Hagihara et al [3] have reported that the DL intensity of KCl crystals after X-ray irradiation is proportional to the F center concentration. The emission spectrum of the DL is also found to be similar to that of thermoluminescence (TL) of the crystal.…”

Correlation between deformation bleaching and mechanoluminescence in coloured alkali halide crystals

“…Ossipyan and Shmurak [17], Molotskii [18] and Molotskii and Shmurak [19] have studied the mechanism of ML excitation in coloured alkali halide crystals. Hagihara et al [20] and Hayashiuchi et al [21] have also investigated the process of ML excitation in -irradiated KCl crystals. Atari [22], Copty-Wergles et al [23], Poletaev and Shmurak [24], Eid et al [25] and Al-Hashmi et al [26] have reported the dependence of the ML of coloured alkali halide crystals on different parameters.…”