• C P Mishra

      Articles written in Pramana – Journal of Physics

    • Photo and electroluminescence properties in Zns: (Cu, La) and Zns: (Ag, La) phosphors

      L N Tripathi B R Chaubey C P Mishra

      More Details Abstract Fulltext PDF

      A method for preparation of ZnS: (Cu, La) and ZnS: (Ag, La) phosphors is described. Photo and electroluminescence of these phosphors have been studied. The voltage and frequency variation of EL brightness have also been reported. The results agree with the collision-excitation mechanism in the Schottky barrier. The emission of blue, green and yellow bands has been interpreted in terms of different electronic transitions. Simultaneous action of both the field and the 3650 Å radiation has been studied. An attempt has also been made to explain the quenching and enhancement.

    • Luminescence in ZnS: La and ZnS: (Mn, La) phosphors

      L N Tripathi C P Mishra B R Chaubey

      More Details Abstract Fulltext PDF

      The photo (PL) and electro (EL) luminescence in ZnS: MnLa and ZnS: La have been studied. The enhancement and quenching of emission bands have been observed on the simultaneous application of sinusoidal field and photons. The wave shape, voltage, frequency and temperature dependence of EL brightness have been reported. A study of the phosphorescence and thermoluminescence of these phosphors is also carried out and it is observed that the trap-depth changes slowly with temperature and activator concentration. An attempt has been made to calculate the trap depth by studying temperature dependence of EL brightness. The results are reported and discussed.

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