Abstract
It is shown that the intensity of emission from intracenter 4f-transitions in amorphous a-Si:H films and crystalline (GaN, ZnO) films doped with rare-earth ions is governed by the local environment of doping impurity ions. In the case of a-Si:H, a pseudo-octahedron with the C 4V point group is present due to nanocrystallites, which provides a local environment for rare-earth ions. In the case of a hexagonal crystal lattice in crystalline GaN and ZnO films, the local symmetry of rare-earth ions introduced into the semiconductor matrix by diffusion, with a pseudo-octahedron with the C 4V point group, is formed by stresses due to rare-earth ion-oxygen complexes with a radius exceeding that of host ions incorporated at crystal lattice sites. In contrast to GaN films, ZnO films exhibit, on being doped with Tm, Sm, and Yb, both high-intensity emission in the long-wavelength spectral region, characteristic of intracenter 4f transitions in rare-earth ions, and a substantial increase in intensity in the short-wavelength spectral region (λ = 368–370 nm). GaN films doped with rare-earth ions exhibit in this spectral range only an inhomogeneously broadened emission spectrum due to the presence of an emission band characteristic of donor-acceptor recombination.
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Original Russian Text © M.M. Mezdrogina, M.V. Eremenko, E.I. Terukov, Yu.V. Kozhanova, 2012, published in Fizika i Tekhnika Poluprovodnikov, 2012, Vol. 46, No. 7, pp. 925–936.
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Mezdrogina, M.M., Eremenko, M.V., Terukov, E.I. et al. Intensity of emission from intracenter 4f-transitions in a-Si:H, ZnO, and GaN films doped with rare-earth ions. Semiconductors 46, 901–912 (2012). https://doi.org/10.1134/S1063782612070135
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DOI: https://doi.org/10.1134/S1063782612070135