Transient behaviour of the mechanoluminescence induced by impulsive deformation of fluorescent and phosphorescent crystals

摘要: Abstract When a crystal is fractured impulsively by the impact of moving piston, then initially mechanoluminescence (ML) intensity increases quadratically with time, attains peak value and later on it decreases time. Considering that solid state ML gas discharge are excited due to charging subsequent production electric field near tip cracks, expressions derived for transient I, time tm Im corresponding versus curve, respectively, total IT, fast slow decays intensity. It shown decay decrease after tm, related strain rate crystals, ML, only observed in phosphorescent equal phosphorescence. The increasing velocity, IT tends attain saturation higher values velocity. increase linearly thickness, area cross-section volume respectively. So far as rise, attainment peak, concerned, there no any significant difference time-evolution emission consisting both ML. From time-dependence time-constant surface created movement single crack, phosphorescence crystals can be determined. A good agreement found between theoretical experimental results. importance fracto induced impulsive deformation discussed.