• Excited state relaxation and energy transfer between Tb3+ → Nd3+ and Tb3+ → Ho3+ in POCl3:SnCl4

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      https://www.ias.ac.in/article/fulltext/jcsc/096/01-02/0103-0113

    • Keywords

       

      Excited state relaxation; energy transfer; fluorescence; Tb3+ donors; Nd3+ and Ho3+ acceptors

    • Abstract

       

      Excited state relaxation in Tb3+ in POCl3:SnCl4 aprotic solvent has been examined. It is found that at a concentration of 10−1 M Tb3+, the fluorescence exclusively originates from the5D4 level. The appreciable increase in the decay times of Tb3+ in this solvent compared to its values in H2O or D2O, suggests that the decrease in non-radiative relaxations is due to the low energy vibrations characteristic of this solvent. Non-radiative transfer of energy from Tb3+ → Nd3+ and from Tb3+ → Ho3+ in this solvent has been established by examining the lifetime data. Calculated values of energy transfer probabilities (Pda) in the liquid air temperature are analysed to obtain a clue regarding the nature of excitation transfer mechanism. In both the systems, the energy transfer from Tb3+ donors to Nd3+ as well as Ho3+ acceptors, occurs predominantly via a dipole-dipole process. At high temperature the energy transfer is increased.

    • Author Affiliations

       

      Janardan Joshi1 J C Joshi2

      1. Department of Physics, Government Post Graduate College, Uttarkashi - 249 193, India
      2. Department of Physics, D S B Constituent College, Kumaun University, Nainital - 263 002, India
    • Dates

       
  • Journal of Chemical Sciences | News

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