Piezoluminescence in zinc-sulphide phosphors

Luminescence induced by elastic deformation of ZnS:Mn nanoparticles

“…Practically, the total emission from elastico ML of ZnS:Mn nanocrystals depends quadratically on the applied stress, [22] hence, these results support the piezoelectric origin of the elastico ML of ZnS:Mn nanocrystals. (iv) When the plastico ML including elastico ML of ZnS:Mn crystals is induced by application of hydrostatic pressure, then intense ML emission is observed [49]. As the dislocations cannot move under hydrostatic pressure [50], the part of plastico ML induced by moving dislocations is suppressed, and the observed ML emission may be attributed to the piezoelectrically-induced plastico ML and elastico ML.…”

Mechanoluminescence induced by elastic deformation of coloured alkali halide crystals using pressure steps

“…However, in practice, the rise of pressure to its maximum value takes some time due to the time constant of the pressure-applying device and, therefore, initially the pressure increases with time and then it attains a maximum value [14,17,37,38]. Thus, if t r is the time constant for rise of externally applied pressure, then the increase of pressure P with time may be given by…”

“…Therefore, the materials exhibiting ML during their elastic deformation may be very useful and find applications in pressure sensors and other electronic devices. It has been reported that X or g-irradiated alkali halide crystals [14][15][16], Mn-doped zinc sulphide [16][17][18] and a few polymers [19,20] show ML when they are deformed elastically. Whereas the ML produced by the plastic deformation and fracture of coloured alkali halide crystals has been studied in detail [1][2][3], least attention has been paid to the ML induced by their elastic deformation.…”

Effect of capping on the mechanoluminescence of γ-irradiated ZnS:Cu nanophosphors

“…Colloidal II-VI ZnS are wide band gap semiconductors, which are known for their novel optical properties and have attracted much attention over the past few years. Mn-doped zinc sulphide [18][19][20] shows ML when they are deformed elastically. Chandra et al [21] reported the theory of the ML of ZnS:Mn nanoparticles, which is based on the piezoelectrically induced electron detrapping model and made a comparison between the theoretical and experimental results.…”