Abstract

In this paper the phenomenon of mechanoluminescence (ML) in CdSe:Mn, CdS:Au, CdS:Mn, CdS:Ag and CdS:Cu (cubic) phosphors is described. When the ML was excited impulsively by the impact of a load on the phosphors the ML intensity increased with time, attained a maximum value and then it decreased. In the ML intensity versus time curve, the peak increased and shifted towards shorter time values with increasing impact velocities and the rising portion of the curve followed an exponential increase and the decaying portion followed an exponential decrease with time. The total ML initially increased with the impact velocity of the load and then it attained a saturation value for higher values of the impact velocities. The total ML intensity increased linearly with the amount (mass) of the phosphors for the higher impact velocities. The ML intensity corresponding to the peak of the ML intensity versus time curve increased linearly with the impact velocities. The time was found to be linearly related to 1000/impact velocity. The ML intensity attained an optimum value for the activator concentration of 0.4% in CdSe:Mn, CdS:Au, CdS:Mn, CdS:Ag and CdS:Cu phosphors. CdSe:Mn phosphors were found to be the most intense ML and the CdS:Cu phosphors exhibited a comparatively weak ML. The ML induced by impulsive excitation in the CdS and CdSe doped phosphors plays a significance role in the understanding of the biological sensors and display device applications.

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