Abstract
The key to preparing nano-films by DC (Direct Current) sputtering is to prepare the film materials into targets. Organic small molecule fluorescent materials (such as 1, 4-Bis(2-cyanostyryl) benzene, to be noted as ER-I) are usually not conductive, and it is not possible to make the elements as targets. Therefore, there are some difficulties in preparing the organic materials into films by DC sputtering. In this paper, we fabricated ER-I nano-films by using the DC sputtering method, and their fluorescence properties are significantly different from those of powder materials. The fluorescence emission spectra of the films prepared by the DC sputtering method have an apparent bimodal morphology. Compared with the ER-I powder material, the fluorescence emission peak has a blue shift of 5 nm and 22 nm. To study the luminescence mechanism of the films, we further investigated the fluorescence properties of the films after thermal treatment and analyzed the structure and surface morphology of the films by XRD and SEM. This paper provides a new idea and method for the preparation of organic nano-films and has a potential application value in the preparation of organic light-emitting films and soft optics devices.
Highlights
In the past two decades, the research on organic solid-state luminescent materials has made significant progress, and they have successfully been used in lasers,1 optical waveguides,2 sensors,3 and organic light-emitting diode (OLED)
We found that the surface of the ER-I film is filled with fine particles, most of the particles are of several nanometers in size, the ER-I distribution on the sample surface is uniform, and the film shows an amorphous state in the SEM photograph
We successfully implemented the method of attaching ER-I to the grids for DC sputtering to prepare organic nano-fluorescent films
Summary
In the past two decades, the research on organic solid-state luminescent materials has made significant progress, and they have successfully been used in lasers, optical waveguides, sensors, and organic light-emitting diode (OLED). In addition, in the solidstate, the intermolecular interactions and molecular arrangement can have a significant effect on the luminescent properties of bulk solid materials. A possible way to achieve modulation of the luminescent properties of the material is by preparing the bulk material as the film. In the past two decades, the research on organic solid-state luminescent materials has made significant progress, and they have successfully been used in lasers, optical waveguides, sensors, and organic light-emitting diode (OLED).. In the solidstate, the intermolecular interactions and molecular arrangement can have a significant effect on the luminescent properties of bulk solid materials.. A possible way to achieve modulation of the luminescent properties of the material is by preparing the bulk material as the film. Using the DC sputtering method to prepare ER-I nano-films is an innovation implemented in this paper. We successfully fabricated ER-I nano-films by the DC sputtering method, and the fluorescence properties of the prepared films were investigated. We performed the thermal treatment combined with XRD and SEM images on the film to further study the luminescence mechanism and thermal stability of the films
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