The structural and optical properties of polypyrrole-ZnO (PPy-ZnO) composites with different amount of ZnO are investigated. The nature of optical absorption and emission of the composites having agglomerated granular morphology is explored. Addition of ZnO slightly affects the conjugation of the polymer chain due to which the π-π* transition of PPy-ZnO composite shows some blue shift in the UV-Vis absorption spectra. The photoluminescence intensity of PPy-ZnO nanocomposite varies with variation of ZnO content. This tunability in the photoluminescence intensity of PPy-ZnO nanocomposite can be understood in terms of Forster Resonance Energy transfer (FRET) from ZnO (donor) to PPy (acceptor). The energy transfer efficiency, Forster radius and separation between donor and acceptor are predicted theoretically by using a FRET model. With the change in donor concentration, the energy transfer efficiency changes which affects the emission intensity of composites. The highest emission intensity is observed for 1.22 g of ZnO which indicates the highest energy transfer between ZnO and PPy. Thus, by tuning ZnO content the emission properties of the PPy-ZnO composite can be tuned.

研究了不同ZnO含量的聚吡咯-氧化锌（PPy-ZnO）复合材料的结构和光学性能。探索了具有团聚颗粒形态的复合材料的光吸收和发射的性质。由于 PPy-ZnO 复合材料的 π-π* 跃迁在 UV-Vis 吸收光谱中显示出一些蓝移，ZnO 的添加会轻微影响聚合物链的共轭。PPy-ZnO纳米复合材料的光致发光强度随ZnO含量的变化而变化。PPy-ZnO 纳米复合材料光致发光强度的这种可调性可以通过从 ZnO（供体）到 PPy（受体）的 Forster 共振能量转移 (FRET) 来理解。能量转移效率、Forster 半径和供体和受体之间的分离是通过使用 FRET 模型理论上预测的。随着供体浓度的变化，能量转移效率发生变化，从而影响复合材料的发射强度。观察到 1.22 g ZnO 的最高发射强度，这表明 ZnO 和 PPy 之间的能量转移最高。因此，通过调节 ZnO 含量，可以调节 PPy-ZnO 复合材料的发射特性。