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|Title:||Preparation and characterization of silver doped (ZnCd)S mixed mechanoluminophors|
Tiwari, Shikha q
Chandra, B P
|Abstract:||Mechanoluminescence (ML) in silver doped (ZnCd)S phosphors is reported. Considering the basic processes involved in (ML), a theoretical approach is made to understand the mechanical characteristics of ML. The expressions derived are able to explain the dependence of ML intensity on several parameters like temperature, time, area of newly created surfaces and surface charge density. Spectroscopic studies of ML are made. The wavelength corresponding to the peak of both the ML and photoluminescence (PL) spectra shift towards longer wavelength with increasing CdS contents. The mechanism of ML is discussed and it is concluded that the impulsive deformation of these phosphors may be due to piezo-electrification of newly created surfaces. The similarity of ML spectra with electroluminescence (EL) and photoluminescence (PL) spectra suggests that although there is a difference in the process of excitation of electrons whereas the relaxation with the emission of photons involves the same process.|
|ISSN:||0975-1017 (Online); 0971-4588 (Print)|
|Appears in Collections:||IJEMS Vol.10(4) [August 2003]|
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