Abstract
To choose among proposed in the literature models of the center responsible for Cu- related blue emission in ZnS:Cu (B-center), the technique of defect drift in external electric field was used. Doped with Cu zinc sulfide single crystals were investigated. After the action of direct electric field of (4–5) 102V/cm at 300°C blue emission was found to enhance near the cathode and to weaken near the anode. This effect was accounted for by the appearance of Cui+ ions due to dissociation of B-centers, following drift of these ions to the cathode and formation of additional B-centers in near cathode region. It was concluded that B-centers are close donor–acceptor pairs consisting of Cuzn acceptors and Cui donors.
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