• Balakrishna Rao Kaza

      Articles written in Pramana – Journal of Physics

    • Some optical properties of rare earth (Dy, Nd and Sm) activated ZnO phosphors

      S Bhushan Balakrishna Rao Kaza A N Pandey

      More Details Abstract Fulltext PDF

      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.

    • Brightness waves of electroluminescence in ZnO:Nd electroluminor

      S Bhushan Balakrishna Rao Kaza A N Pandey

      More Details Abstract Fulltext PDF

      Brightness waves due to sinusoidal excitations for ZnO:Nd electroluminor have been investigated for a temperature range 93°K to 363°K. During each cycle of excitation it consists of two primary waves each associated with a secondary wave, which grow and disappear twice in this temperature range. These results have been discussed in terms of existing models.

  • Pramana – Journal of Physics | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.