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|Title:||Light-emission in Tb<sup>3+ </sup>and Eu<sup>3+</sup>: PVP polymer films|
|Abstract:||Analysis of photoluminescence spectra of PVP and Tb<sup>3</sup><sup>+</sup> or Eu<sup>3+</sup>: PVP polymer films has been done. Emission spectrum of the host matrix poly (vinyl pyrrolidone) (PVP) has shown an intense blue emission at 424 nm [<i>π</i><sub>0→</sub> n<sub>1</sub>π<sub>2</sub>]. By using a solution cast method, more clear and transparent PVP polymer films have been developed for analysis with the addition of Tb<sup>3</sup><sup>+ </sup>and Eu<sup>3+</sup> ions separately into PVP polymer matrix;<i style=""> </i>green and red colour emitting polymer films have been developed. Also undoped PVP polymer film has been prepared as a reference film for which XRD, FTIR, Raman and TGA-DTA spectral profiles have been carried out. From the measured emission spectrum of the Tb<sup>3+</sup>: PVP polymer film, an intense green emission at 544 nm (<sup>5</sup>D<sub>4</sub>→<sup>7</sup>F<sub>5</sub>) has been observed with an excitation at 311 nm. Under an UV source a bright green emission has been noticed from the surface of the Tb<sup>3+</sup>: PVP polymer film, and a bright red emission has been noticed from the surface of the Eu<sup>3+</sup>: PVP polymer film. The emission spectrum of Eu<sup>3+</sup>: PVP polymer film has also revealed an intense<i style=""> </i>red emission at 612 nm (<sup>5</sup>D<sub>0</sub>→<sup>7</sup>F<sub>2</sub>).|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.49(06) [June 2011]|
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