Preparation and characterization of gold doped (Zn, Cd)S mixed phosphors for mechano-optical transducers

Abstract

When mechanically excited, initially the ML intensity increases, attains a maximum value and then decreases with time. The total M L intensity I r initially increases with the impact velocity V o of piston and attains a saturation value for higher values of V o and follows o and 1/ are constants. The ML intensity is the relation /.r=l°exp(-V/V o) where I T 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 M L spectra with EL and PL spectra suggests that although the excitation processes are different, emission process is governed by the states of similar nature.

Luminescence induced by elastic deformation of ZnS:Mn nanoparticles

“…As ZnS is piezoelectric, this fact indicates that the ML of ZnS:Mn nanoparticles should be related to the conversion of mechanical energy into electrical energy, followed by the conversion of electrical energy into light energy. It has been reported that in the thin film electroluminescence of ZnS:Mn, the total number of photons emitted is directly related to the total electrostatic energy [57,58]. Thus, the total elastico ML of ZnS:Mn nanoparticles should also be related directly to the total electrostatic energy of the system.…”

Role of Fe2O3 in fly ash surrogate on PCDD/Fs formation from 2-monochlorophenol

“…[17][18] In the municipal solid waste incineration (MSWI), the content of iron in the fly ash varies significantly depending on the facilities and the sampling time. [19][20][21][22][23] The weight percent of Fe 2 O 3 in fly ash ranges from < 1% to ~ 30%. 23 The effects of iron content and its cluster morphology in the fly ashes on the yields of PCDD/Fs is currently unknown.…”

Progress in triboluminescence-based smart optical sensor system

“…Because ZnS is piezoelectric by nature, the TL of ZnS:Mn nanoparticles should be related to the conversion of mechanical energy into electrical energy, and then into light energy [51]. For thin films, the total number of photons emitted is directly related to the total electrostatic energy [56,57]. When TL is induced by applying a load onto ZnS:Mn nanoparticles with the time constant t r for rise of pressure P to the final pressure P o in time t, the peak TL intensity may be given as [51]:…”