Optical behaviour of tetracyanoplatinate (MCP) encapsulated sol-gel glasses

The photoluminescence spectra at atmospheric pressure and high pressure photoluminescence spectra of the tetracyanoplatinate salts (MCP) KLiCP . 2H(2)O, KNaCP . 3H(2)O, Cs2Ca(CP)(2) . nH(2)O and Cs2CP . H2O encapsulated soi-gel glasses are reported. In all these sol-gel glass systems we have found large pressure dependent shift of the phololuminescence maxima under hydrostatic high pressure condition (up to 13 nm/kbar) and therefore, prove to be as most sensitive probes to enable us to calculate pressure at different stages of gelation, aging and drying of the gel glass. The pressure dependent shift, along with the position of the peak maxims and band width at half height, are measured for the photoluminescence spectra at atmospheric pressure as well as at high pressure. Concentration effect has also been studied in the present system to arrive al more conclusive picture of the dopant matrix and dopant-dopant interaction. The fluorescence life time, as well as integrated emission intensity as a function of concentration, have also been studied in all the four glass systems which allows us to identify the dimer and cluster spectra.