UV–Deep Blue–Visible Light‐Emitting Organic Field Effect Transistors with High Charge Carrier Mobilities

Two non‐single‐crystal high‐mobility single‐layer light‐emitting field‐effect transistors (LEFETs) exhibiting narrow UV and deep‐blue emission are described. The organic semiconductors are based on a [1]benzothieno[3,2‐b][1]benzothiophene (BTBT) scaffold and achieve charge carrier mobilities of 2 and 6 cm² V⁻¹ s⁻¹, respectively. The general applicability of BTBT‐C10 as an excellent semiconductor for LEFETs is then demonstrated in conventional heterostructure LEFETs. Here it acts as a thin charge carrier layer underneath blue, yellow, and red organic light‐emitting materials. This layout increases the emissive layers' optical and electrical characteristics by several orders of magnitude. Both device architectures give way toward novel display technologies and potentially injection lasers.