Abstract
Abstract A series of undoped and rare earth (Dy, Yb, Nd, Pr, Gd, La, Sm and Er) doped ZnO electroluminors have been prepared and their photo-(PL) and electroluminescence (EL) spectra at different concertrations of rare earth ions have been investigated. PL and EL spectra of undoped electroluminors consist of three peaks. Due to the addition of the rare earth ions these peaks are shifted either to the longer or to the shorter wavelength side. The intensities are also either decreased or increased. Experimental results favour the donor—acceptor model for this system.
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