Abstract
This study investigates the near infrared (NIR) photoluminescent properties of polyethylene oxide (PEO) and polyvinyl pyrrolidone (PVP) blended polymer composites doped with Pr3+ and Yb3+ ions. The doped composites were synthesized using the conventional solution casting method. X-ray diffraction confirmed the amorphous nature of the composites, while Fourier-transform infrared spectroscopy revealed the intermolecular and ion-polymeric interactions. The Yb3+-doped polymer composites possessed a broad emission centered at 1.01 μm (2F5/2→2F7/2). Significant NIR emission was observed at 1.47 μm (1D2→1G4) in the Pr3+-doped polymer composites. This peak was enhanced by increasing the Pr3+ concentration in the matrix. Prevalent luminescence (PL) was observed at the optimal concentration of 0.2 wt% of Pr3+. The PL intensity diminished at concentrations higher than the optimal concentration because of the quenching effect. The NIR emission at 1.47 μm (1D2→1G4) was intensified after co-doping Pr3+ with Yb3+, owing to energy migration from Yb3+ to Pr3+. The optimal Yb3+ concentration, or optimal sensitizer concentration, in the co-doped matrix was 0.15 wt%. The energy transmission pathway from Yb3+ to Pr3+ was illustrated using an energy level scheme diagram. The prepared (0.2 wt%) Pr3+/(0.15 wt%) Yb3+:PEO/PVP blended polymer composite has potential in various NIR photonic and optoelectronic applications.
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