2LJ-15: Energy transfer based spectral properties of TiO 2 NPs impregnated co-doped Gd 3+ +Eu 3+ : PVA polymer nanocomposites for luminescent Applications

We have synthesized Eu3+: PVA, Gd3+: PVA, Gd3++Eu3+: PVA and Gd3++Eu3++ TiO2 nanoparticles: PVA polymer films by solution casting method. Eu3+ doped PVA polymer films displayed a red emission at 618 nm (5D0→7F2) under 396 nm (7F0→5L6) of excitation. Upon co-doping with Gd3+ to Eu3+: PVA polymer film, it exhibits enriched red emission than singly doped Eu3+: PVA under 270 nm of excitation due to energy transfer from Gd3+ to Eu3+ ions. After dispersion of TiO2 NPs in the co-doped Gd3++Eu3+: PVA polymer films, the PL properties of Eu3+ are remarkably enhanced. Red emission of Eu3+ is significantly enhanced though an efficient ET process from Gd3+ to Eu3+ and TiO2 NPs to Eu3+. These polymer nanocomposite films could be suggested as promising candidates for red luminescent photonic devices.