• S Chandra

      Articles written in Pramana – Journal of Physics

    • Photo and electroluminescence of ZnO : Er and ZnO : Ag, Er electroluminors

      S Bhushan M Saleem S Chandra

      More Details Abstract Fulltext PDF

      A number of ZnO : Er and ZnO : Ag, Er electroluminors have been prepared and their photo (PL) and electroluminescent (EL) properties investigated. While the addition of Ag slightly shifts the PL spectra towards longer wavelength side, the EL spectra not only shift but consist of some new transitions. In ZnO : Er electroluminors, additional transitions also exist at higher frequencies of excitations. Brightness waves for this system consist of two secondary peaks during each half cycle of exciting field. Temperature dependence shows two broad peaks. While voltage dependence of ZnO : Er satisfies the relationB=B0 exp(−b/V1/2), the relationB=B0V exp(−b/V1/2) is found to be suitable for ZnO : Ag, Er electroluminor. Possible mechanisms for these phenomena have been proposed.

    • Einstein A-coefficients for rotational transitions in the HN2O+

      S Chandra A K Sharma

      More Details Abstract Fulltext PDF

      EinsteinA-values for the electric dipole transitions between the rotational levels up to 540 cm−1 andJ=11 in the ground vibrational state of the protonated N2O (i.e., HN2O+) are calculated. The coefficients are used to compute the mean radiative lifetimes of the levels. TheseA-values can be used for analysing the spectra from astronomical objects, if observed.

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