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Luminescent Organic Semiconducting Langmuir Monolayers
Elena V Agina1,2, Artur A Mannanov2,3, Alexey S Sizov1,2
1Institute of Synthetic Polymeric Materials of the Russian Academy of Sciences , Profsoyuznaya street 70, 117393 Moscow, Russia.
ACS Applied Materials & Interfaces
|May 11, 2017
Summary
Researchers developed a novel organosilicon material for self-organized monolayers. This material enables efficient charge transport and luminescence in organic field-effect devices, advancing optoelectronics.
Area of Science:
- Organic electronics
- Materials science
- Optoelectronics
Background:
- Monolayer organic field-effect devices like transistors and sensors show great promise.
- Monolayer electroluminescent organic field-effect devices are underdeveloped.
- A key challenge is creating organic materials that self-organize into monolayers, combining charge transport and luminescence.
Purpose of the Study:
- To report a novel organosilicon derivative of oligothiophene-phenylene dimer (D2-Und-PTTP-TMS) for monolayer applications.
- To investigate the self-assembled Langmuir monolayers of this dimer.
- To evaluate their semiconducting properties in organic field-effect transistors (OFETs).
Main Methods:
- Synthesis of a novel organosilicon derivative of oligothiophene-phenylene dimer.
- Formation and characterization of self-assembled Langmuir monolayers (LAMs).
- Techniques used: photoluminescence spectroscopy (steady-state and time-resolved), atomic force microscopy (AFM), X-ray reflectometry (XRR), grazing-incidence X-ray diffraction (GIXD), and OFET device fabrication and testing.
Main Results:
- Uniform, fully covered, and highly ordered monolayers were successfully fabricated.
- These ordered monolayers exhibited semiconducting properties.
- The study confirmed that ordered 2D packing in semiconducting Langmuir monolayers is compatible with high-yield luminescence.
Conclusions:
- 2D molecular aggregation does not inherently prevent highly luminescent properties in organic monolayers.
- The developed organosilicon material meets the requirements for efficient charge transport and luminescence in monolayers.
- Findings facilitate the rational design of functional materials for monolayer organic light-emitting transistors and other optoelectronic devices.
