The fluorescence of zinc sulphide activated with copper

Some Properties of Zinc Sulfide Activated with Copper and Cobalt

“…Moreover, all transition processes that are theoretically possible in such a model are found in this case. In summary, there are the absorption [1] and emission [3] for ttie activator levels, which are obvious for a luminescent substance; for the Co levels there are transitions [6] and [9] of the same kind, causing the killing properties; s we find the capture [5] and thermal release [7] of the electrons by these same levels, which are then functioning as traps, leading to the phosphorescence and glow phenomena; further, there are the equivalent transitions [2] and [4] at the activator levels, which give rise to the thermal quenching and to the exponential de~ay at high temperatures. Finally, the picture is completed with absorption transitions of trapped electrons to the empty band [8], and of holes from activator levels to the filled band.…”

“…The latter are obviously not the only ones active in this way, for copper-activated zinc sulfides without cobalt are quenched at nearly the same temperature. At high temperatures, transition [4] may be the main factor in decreasing the number of excited Cu levels during the decay, thus causing a monomolecular part of the decay with a decay constant proportional to "n 9…”

Neutron transmutation doping as an experimental probe for CuZn in ZnSe

“…1 In ZnS and ZnSe, copper doping results in a variety of characteristic bands in the visible region. 2 Work to develop a microscopic description of the copper impurity in these compounds has continued for many years 3,4 and still no clear consensus exists.…”

A printed hybrid warm white light source : from fabrication to physics-based model

“…No additional luminescence is detected without doping coactivators. In both Rothschild et al and Kröger et al's study, no blue or green emissions are produced with the addition of Cl coactivators[170,171]. With the equal amount of activator and coactivator, a green emission associated with Cu (G-Cu) is produced.…”

“…Many research works have been published to study the electroluminescence of ZnS phosphors doped with different activators and co-activators [170,171]. The luminescence with different concentrations of activators and coactivators is summarized in Figure 5.12.…”