Showing papers by "Hirdyesh Mishra published in 2010"
TL;DR: A systematic and significant improvement in the thermal and fluorescence properties of the complex is observed with an increase in the mole concentration of Phen and the maximum fluorescence is observed for Eu(DBM)(3)Phen(1·5), which is a new composition as compared with the usual composition reported.
Abstract: Tris (dibenzoylmethanido) (o-phenanthroline)-europium(III) complexes [Eu(DBM)3(Phen)x] have been synthesized, and their structural, thermal, and fluorescence properties have been investigated both as an independent complex and also after embedding it in poly(methyl methacrylate) (PMMA) polymer matrix. X-ray analysis reveals an unusual crystalline to amorphous transformation in structure of the Eu(DBM)3Phenx complexes when x exceeds 1.0 (mole %). Differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR) analysis depict the interaction between the Eu(DBM)3Phenx complex and the PMMA matrix. The fluorescence intensity of Eu3+ ion in the Eu(DBM)3Phen1·5 complex is an order of magnitude larger compared to the Eu(DBM)3·2H2O complex. In addition to the transition 5D0 → 7F2, which has a rise time of 83 μs, transitions from the 5D1 and 5D2 levels are also observed, along with several ligand field splittings in the Eu(DBM)3Phen1·5 complex. Appearance of a rise time (∼0.76 ns) in the ...
94 citations
TL;DR: In this paper, the photophysical properties of cinchonine dication (C++) have been studied in protic and aprotic polymers by monitoring steady state and time resolved measurements.
5 citations