Abstract
Polymer blended films of PEO+PVP and singly doped and co-doped with Mn2+ and Tb3+ ions have been synthesized by solution casting method. Structural, thermal and optical properties of these films have been carried out. Thermal stability of these films has been investigated based on the measurement of TG-DTA profiles. Raman analysis demonstrates the complex formation of the polymer with the dopant ions. The optical absoption spectra of Mn2+ and Tb3+ seperately doped polymers exhibits characteristic bands in octahedral symmetry. From the emission spectrum, two emission bands at 510nm (green) and 614nm (red) are attributed to the T1 A1, and A1 A1 transition of Mn 2+:PEO+PVP polymer films under 370nm excitation. In Tb3+ doped PEO+PVP polymer samples exhibit green emission at 546 nm (green) due to a transition of (D4 F5) under 370nm excitation. The enhanced red emission at 614nm of Mn 2+ ions is attributed to an effective energy transfer of Tb3+ Mn2+ ions in the co-doped blended polymer film, which has been evidenced from the measurement of luminescence spectra and emission decay dynamics. These polymeric materials are suggested as bright visible colour luminescent materials.
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