Energy transfer based photoluminescence spectra of Dy3+, Sm3+: PEO+PVP polymer films

Abstract

Dy³⁺, Sm³⁺ ions doped PEO+PVP polymer films and also a host PEO+PVP polymer films have successfully been synthesized by solution casting method. For the PEO+PVP film, its XRD, FTIR, Raman and TG-DTA profiles have been investigated in order to understand its structural and thermal properties. Dy³⁺ doped film has displayed a blue emission under an UV source. Photoluminescence spectra have been measured to study its optical properties. For observed blue emission at 480 nm (⁴F_9/2→ ⁶H_15/2) of Dy³⁺ film, its decay curve has been measured in evaluating the lifetime of the blue emission. The Sm³⁺ polymer film has displayed an orange emission under an UV source. For this Sm³⁺ film, emission spectra have been measured to evaluate its optical properties. For the orange emission at 600 nm (⁴G_5/2→ ⁶H_7/2) of Sm³⁺, the transitions of Sm³⁺ are clearly explained in the form of an energy level diagram. In the co-doped system, an energy transfer between the dopant ions in the host polymer matrix has been explained. These results suggest these films as blue and orange luminescent optical materials.