Preparation, characterization and photoelectric properties of dual-emissive Langmuir–Blodgett film of europium-substituted polyoxometalate and zinc(II) porphyrin platinum(II) complex

• Published in: Thin solid films 2013-06, Vol.537, p.247-251
• Main Authors: Ni, Jing, Fu, Qiao-Min, Liu, Li, Gu, Zhen-Rui, Zhou, Zhou, Li, Fa-Bao, Zhang, Shu-Xin, Liu, Shi-Zhong, Du, Zu-Liang
• Format: Article
• Language: English
• Subjects: Acetal resins; Alkyne; Blends; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Electronic transport phenomena in thin films and low-dimensional structures; Exact sciences and technology; Langmuir-Blodgett films; Langmuir–Blodgett film; Liquid phase epitaxy; deposition from liquid phases (melts, solutions, and surface layers on liquids); Luminescence; Materials science; Metalorganic compounds; Methods of deposition of films and coatings; film growth and epitaxy; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Photoconduction and photovoltaic effects; photodielectric effects; Photoelectric effect; Photoluminescence; Photovoltages; Physics; Polymer blends; Polyoxometalate; Porphyrin; Porphyrins; Structure and morphology; thickness; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Thin film structure and morphology; Zinc
• ISSN: 0040-6090; 1879-2731
• DOI: 10.1016/j.tsf.2013.04.032

An organometallic/inorganic composite Langmuir–Blodgett (LB) film was prepared using a rigid-rod zinc(II) porphyrin platinum(II) complex coordinated with trans-bis(ethynylbenzene) (ZnPPt) as the π-conjugated organometallic molecule, and a europium-substituted polyoxometalate (POM), Na9EuW10O36 (EuW10) as the inorganic component. The structure and photophysical properties of the LB film was characterized by π–A isotherms, UV–vis absorption and photoluminescence spectra, atomic force microscopy imaging and scanning tunneling microscopy. The results indicate that stable, well-defined Langmuir and LB films were formed using pure water and POM as subphases. Luminescence spectra of the hybrid LB film showed that the emission spectra were obtained due to the dual-emissive nature of the mixed ZnPPt/EuW10 blends, and EuW10 was able to enhance the emission of ZnPPt. The ZnPPt-based LB film displayed an interesting electrical conductivity behavior. The 3-layer film formed by ZnPPt/EuW10 complex had a strong electrical response, giving rise to a tunneling current up to ±100nA when the voltage was monitored at −1.4–3.1V. When it was excited by light, the LB composite film generated a photovoltage of 24μV, indicating that the hybrid film had a strong photovoltage response as well. •The organometallic composite is a zinc(II) porphyrin platinum(II) complex.•The inorganic composite is a europium-substituted polyoxometalate.•The film showed a good electrical response and a strong photovoltage response.•The film displayed dual-emissive nature of the mixed blends.