Studying of Energy Transfer Mechanisms and Optical Characteristics of MDMO-PPV Conjugated Polymer Doped with CuO Nanoparticles

<title>Abstract</title> <p> In this study, the optical characteristics and energy transfer mechanism of conjugated polymer MDMO-PPV with and without adding copper oxide CuO nanoparticles were studied. The NPs synthesized by Laser Ablation in Liquid technique using Nd: YAG pulsed laser with 600 mJ, 3 Hz, 10 ns, four number of shotes (200, 400, 600, and 800), and 10 ml of distilled water. To prepare polymer samples, xylene used as a solvent to make three concentrations (1*10 ^− 6 , 1*10 ^− 7 , and 1*10 ^− 8 ) M. The optical and spectral properties of polymer samples studied by using UV-Visible and F96 PRO spectrophotometer in the range of (200–800) nm and the related parameters were calculated by several equations. The synthesized CuO NPs sent for examination by FE-SEM technique which showed that the particles were spherical and in size of (44–63) nm. The optical and spectral results showed that the polymer have two peaks of absorption in UV and Visible region before NPs addition while the absorption peak with NPs shifted to high energy region. The photoluminescence spectrum of polymer samples shows appearing of three peaks in visible region after addition instead of one peak and Sholder. The overlapping between absorption and emission spectra was 75 nm which confirms a strong energy transfer. The fluorescence life time found to be 8.83*10 ^− 10 s which clear an excellent time to use this composite as an active laser medium. </p>