A model for thermoluminescence and related phenomena in PbSO₄:Sm

Abstract

A model for energy states in a typical crystal containing substitutional cations is reconsidered with emphasis on the behaviour of electrons normally occupying states in impurity levels in the forbidden band. The model is used to explain thermoluminescence after irradiation and field excitation, the fading of colour centres and the unusual type of luminescence kinetics for which the pre-exponential factor in the rate equation is inversely proportional to the dose. A method of finding activation energies from graphs of depolarisation current against temperature is used to find values for PbSO4:Sm. These and measurements from isothermal decays, glow curves, absorption and emission spectra are entered in an energy band diagram.

Ab initio study of PbCr(1−x)SxO4 solid solution: an inside look at Van Gogh Yellow degradation

“…Also in this case, PBE slightly underestimates the experimental band gap of 4.2 eV. 31 While HSE predicts a too large band gap, the G 0 W 0 results are the closest to experiment, E g ( G 0 W 0 ) = 4.13 eV.…”

Parameters of Charge Carrier Traps in ZnSe

“…The detailed researches of the trap energy spectrum showed that, in various crystals -e.g., Ba [16], NaCl [17], LiF [18], KCl and NaI [19], ZnS:Cu [20], AlN:O [21], PbSO 4 [22], CaS [23] and ZnSe [24] -the energy positions of local trap levels are equidistant and can be described by the harmonic oscillator formula…”

Sodium Dodecyl Sulfate Assistant solvothermal Synthesis and Characterization of Ag2S/PbSO4 Nanocomposites

“…These prospects of nanocomposites lead to drastic improvement in their physical and chemical properties. Different nanocomposites, including hollow spheres Fe2TiO5/α-Fe2O3nanocomposite [1], carbon hollow spheres encapsulating silver nanoparticles [2], hollow silica/magnetic composite spheres [3], hollow zeolite spheres [4], Polyaniline (PANI)/Fe3O4 composite hollow spheres [5] and micro spheres Mg5(OH)2(CO3)4·4H2O [6], CdS [6], Fe3O4 [8], PbSO4 precipitated in a solution of polyethylenimine [9], rodshaped PbSO4 nanocrystals were prepared under the presence of poly sodium-p-styrene sulfonate (PSS) [10], lamellar mesostructures of nanocrystalline PbSO4 prepared by hydrothermal treatment and lead sulfate films with two layerstructure [12]. layer structure [11].…”