1,4 bis (2-methylstyryl) benzene: A simple organic thin film with promising optical properties for OLED applications

With the combination of organic materials and electroluminescence technology organic light emitting diodes (OLEDs) are revolutionizing the optoelectronic field by offering superior output with tunable colors. In this context, the present work investigates the structural, optical, electrical, thermal and electrochemical properties of novel 1,4 bis (2-methylstyryl) benzene (Bis-MSB) thin film prepared by simple and cost-effective spin coating technique, with focus on its potential for OLED applications. Structural analysis of the prepared films was conducted using XRD and FTIR. Morphological behavior was studied through FESEM analysis. Optical characterization, performed through UV–Vis absorption and transmittance measurements, revealed that the film exhibits strong absorption in the UV region and ∼ 85 % transmittance in the visible region. The optical bandgap was found to be 2.94 eV, which falls within the range appropriate for blue OLEDs and it was further corroborated by photoluminescence analysis. The CIE plot also confirmed the material's ability to produce blue emission. Electrical performance was assessed through I-V measurements under dark and light conditions, demonstrating the material's photocurrent generation capabilities. Electrochemical characteristics of the film were investigated using cyclic voltammetry, revealing a diffusion-controlled behavior. To explore device level performance, an OLED device is fabricated with Bis-MSB as the active layer, resulting in the successful observation of blue electroluminescence with an EQE of 1.24 %. The observed optical, electrical and device characteristics confirm that the Bis-MSB thin film is a potential candidate for OLED applications.