| Abstract [eng] |
Organic electroactive compounds gained worldwide interest in the search for alternative materials for large area, flexible, lightweight, and energy efficient optoelectronic devices. In the following work, synthesis, investigation of thermal, optical properties of four triphenylethylene based derivatives of carbazole and 9,9-dimethylacridine are presented. Photophysical properties as well as aggregation induced emission properties of target luminogens were investigated and presented in this work. It was found that all the molecules showed low fluorescence intensities in solutions but intensive emission in the solid state. Solvatochromic shifts of emission bands of the solutions of four compounds depending on the solvent polarity were observed due to the donor-acceptor molecular architecture of the compounds. Thermal properties of the compounds were estimated by differential scanning calorimetry and thermogravimetrical analysis, which confirmed the thermal stability of the target molecules and high morphological stability of their glasses. The investigated compounds showed glass formation abilities and high decomposition temperatures. Organic light emitting diodes were fabricated utilizing the synthesized compounds as emitting materials. The devices based on two derivatives of acridane and one derivative of carbazole as emitting layers were fabricated. The highest brightness of 5700 cd/m2 and power efficiency of 3.2 lm/W was achieved for 9,9-dimethylacridine derivative with fluorinated acceptor. |
