Abstract
Lead sulfide nanoparticles (PbS NPs) have been synthesized directly in poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) semiconducting polymer by a simple low temperature method. Hybrid solutions with different concentrations of PbS with respect to the polymer have been prepared and characterized first in solution and then as thin film nanocomposites deposited on quartz substrates by spin coating. Quenching of photoluminescence emission is observed both in solutions and thin films when the ratio of PbS NPs increases with respect to the polymer, suggesting the occurrence of Dexter energy transfer from the polymer to the PbS NPs. Optical absorption is markedly increased for hybrid solutions compared to pure polymer. In thin nanocomposite films an enhancement of absorbance is observed with increasing PbS NPs concentration, which is more pronounced below 400 nm. The reported results could lead to the development of a method for tailoring the optical response of devices based on PbS NP-polymer nanocomposite by controlling the PbS NP concentration inside the polymer matrix.
Highlights
IntroductionHybrid composites, based on inorganic semiconducting nanoparticles (NPs) embedded in organic or polymeric matrix, have been the subject of intensive research during the last decade [1,2,3,4]
Hybrid composites, based on inorganic semiconducting nanoparticles (NPs) embedded in organic or polymeric matrix, have been the subject of intensive research during the last decade [1,2,3,4].These materials are attractive if they can be synthesized and processed at low cost
MDMO-PPV was dissolved in toluene (0.31 mg/mL) and Pb(SPhF)2 complex was dissolved in DMSO (10 mg/mL)
Summary
Hybrid composites, based on inorganic semiconducting nanoparticles (NPs) embedded in organic or polymeric matrix, have been the subject of intensive research during the last decade [1,2,3,4]. These materials are attractive if they can be synthesized and processed at low cost. Examples are nanocomposites processed from solution that can be cast by simple techniques, such as different printing technologies, drop-casting, or spin-coating, among others The use of such materials as active layers for several optoelectronic devices [5,6,7,8] is increasing the interest of studies on their optical properties. In contrast to hot injection routes such as the well-known TOP-TOPO method, we present here a very simple chemical colloidal method that can be carried out at low temperature, easing commercial scale production
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