Defect state modification, Forster Resonance energy transfer and charge transfer induced luminescence from Polypyrrole modified Zinc oxide nanoplates

• Published in: Materials science in semiconductor processing 2024-05, Vol.174, p.108192, Article 108192
• Main Authors: Dey, Smita, Chatterjee, Sathi, Kar, Asit Kumar
• Format: Article
• Language: English
• ISSN: 1369-8001; 1873-4081
• DOI: 10.1016/j.mssp.2024.108192

The structural, optical properties and underlying photophysical phenomena controlling the luminescence of PPy modified ZnO nanoplates are discussed in details here. Scanning electron micrographs reveal that the size of ZnO nanoplates prepared in presence of PPy decreases as compared to that of pristine ZnO. The crystallite size obtained from XRD for the PPy modified ZnO nanoplates also decreases as compared to that of pristine ZnO. O1s core level XPS spectra of ZnO synthesised in presence of PPy as well as pure ZnO show that oxygen vacancy in ZnO decreases in presence of PPy than that of pure ZnO. This in turn helps to reduce the visible emission and enhance UV emission from the ZnO nanoplates obtained in presence of PPy. The overall emission intensity of PPy modified ZnO samples decreases as compared to pristine ZnO. This indicates that apart from the modification of defect states of ZnO, different photophysical interactions like Forster Resonance Energy Transfer (FRET) as well as charge transfer also come into play to quench the overall luminescence of PPy modified ZnO.