Abstract
Pt(II) complexes are one of the most widely studied compounds worldwide due to their rich luminescent properties, including those arising from non-covalent interactions (Pt-Pt bonds). Besides obvious change of emission wavelength upon aggregation, these compounds can show AIE (aggregation-induced emission). This effect opposes widely known ACQ, aggregation-caused quenching, which is typical for the majority of luminophores, and thus can be interesting for OLED applications. To achieve aggregation in Pt(II) complexes in non-solid environment, mixtures of “good-bad” solvents are used. An alternative way is doping of polymeric films with target complex. In present work we study both approaches, using novel complexes Pt0–Pt3 (Fig.1) as doping agents. The studied complexes’ series were designed to combine two advantages: flat square-planar Pt(II) fragment, prone to aggregation, and phosphine oxide functional group, that can potentially improve electron-transport characteristics of emissive layer in OLED devices. Emission characteristics and their dependence on concentration of doping agents are discussed herein. This work was supported by RSF (project № 24-13-00024). The authors thank Centres for Magnetic Resonance, for Optical and Laser Materials Research, for Chemical Analysis and Materials Research, and X-ray Diffraction Centres (Research Park of St Petersburg University) for providing the necessary equipment and analyses.