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Shikha Tiwari
Articles written in Bulletin of Materials Science
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Volume 18 Issue 5 September 1995 pp 503-515
Sanjay Tiwari Shikha Tiwari B K Sahu B P Chandra
When mechanically excited, initially the ML intensity increases, attains a maximum value and then decreases with time. The total ML intensity
I T initially increases with the impact velocityV o of piston and attains a saturation value for higher values ofV o and follows the relationI T=I Toexp(−V c/V o) whereI To andV c are constants. The ML intensity is maximum for 20% CdS contents in the (Zn, Cd)S phosphors due to increase in hardness which may in turn increase the fracture stress and subsequently the piezoelectric field strength. The wavelength corresponding to the peak of both the ML and PL spectra shift towards longer wavelength with increasing CdS contents. Some models are discussed and it is concluded that the impulsive deformation of these phosphors may be due to piezoelectrification of newly created surfaces. The similarity of ML spectra with EL and PL spectra suggests that although the excitation processes are different, emission process is governed by the states of similar nature.
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Bulletin of Materials Science
Volume 46, 2023
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Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
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