ИСТИНА

Organic light-emitting transistors (OLETs) can have several advantages over the more traditional organic light-emitting diodes (OLEDs) such as higher brightness and efficient light outcouplingi. However, the main difficulty in creation of high-performing OLET is the combination of efficient luminescence and high charge mobility in one material. Also, optical waveguiding effect in OLET active layer strongly decreases light emission from its top surface degrading the OLET performance. To avoid this, 2D films thinner than 100 nm would be beneficial. In this work, we report on OLETs based on solution-processed 2D films of BTBT-based molecules, 2,7-bis(4-decylphenyl)[1]benzothieno[3,2-b][1]benzothiophene (DPBTBT), which uniquely combine high charge mobility reaching 7.5 cm2/Vs and pronounced electroluminescence (Fig. 1). DPBTBT molecules are self-organized in large-area ultrathin films consisting of one or a few molecular layers, which are single crystal according to optical, atomic-force and photoluminescence microscopy. The 2D DPBTBT OLETs demonstrated particularly good shelf-life stability in the ambient air under normal laboratory conditions. The charge-carrier mobility changes by about 15% after 3 months of storage. High charge mobility, good shelf-life stability and good luminescence properties suggest that 2D BTBT-based materials are a promising platform for OLETs.