Lyoluminescence of inorganic salts

Experimental and theoretical study of mechanoluminescence and lyoluminescence of Li3PO4: RE (RE=Dy and Tb) phosphors

“…The electric field E o = σ/ε o (where ε o is the permittivity of free space) produced at the crack may cause bending of the conduction band, valence band and the energy levels of electron/hole trapping centres. Near the positively charged surface of the crack, the conduction band, valence band and trapping level are bended downwards; however, near the negatively charged surface these bands are bended upwards . As the difference between the hole trapping level and valence band is less in phosphate‐based phosphors, the significant band bending may cause tunnelling of holes from the hole trapping level to the valence band.…”

Systematic study of photoluminescence, lyoluminescence and mechanoluminescence in Ce3+‐ and Eu3+‐activated Li3PO4 phosphors

“…Emission of light during the dissolution of alkali chlorides exposed to cathode rays was first observed in 1895 by Wiedmann and Schmidt who named it lyoluminescence . Nearly 60 years later, interest in this field was revived by the work of Ahnstrom and Ehrenstein among others . These workers observed the emission of light during the dissolution of a number of substances such as glucose, sorbitol, saccharose, glycine, NaCl, LiF and Kl, which had been previously irradiated by γ‐rays, high‐energy electrons or fast neutrons.…”

“…The spectral lyoluminescence of irradiated alkali sulfates such as Li, Na, K and Rb has been studied . Studies have been conducted on the lyoluminescence of various alkali carbonates and ammonium persulfate , the effect of temperature on lyoluminescence in potassium halide microcrystals in luminol solution , the preparation of (K:Eu)NaSO 4 phosphor for lyoluminescence dosimetry of ionizing radiation , the effect of lyoluminescence decay in impurity‐doped KCl microcrystalline powder in lyoluminescence dosimetry of ionization radiation and the mass and temperature dependence of lyoluminescence intensity of microcrystalline KCl powder . However, no systematic study has been made on the lyoluminescence of mixed phosphate systems.…”