Abstract
Some rare earth (Dy, Nd and Sm) doped ZnO electroluminors have been prepared in vacuum (1 torr) and their photo (PL) and electroluminescence (EL) spectra investigated at room temperature at different concentrations of rare earth (RE) ions. Compared to the spectra of undoped ZnO, these spectra consist of the same bands shifted either towards low or high energy side and the intensity of high energy band is decreased while that of low energy band is enhanced. In any case no additional band or line was observed. The experimental results have been explained on the basis of donor-acceptor pair model of recombination process where donor levels are due to RE ions and the acceptors are the luminescent centres of undoped ZnO electroluminors. The mechanism of excitation is of acceleration-collision type.
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Bhushan, S., Kaza, B.R. & Pandey, A.N. Some optical properties of rare earth (Dy, Nd and Sm) activated ZnO phosphors. Pramana - J Phys 11, 67–72 (1978). https://doi.org/10.1007/BF02846307
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DOI: https://doi.org/10.1007/BF02846307