Organic electroluminescent device comprising two-dimensional emissive layer
摘要
說明書
Two-dimensional (2D) layered materials show unusual physical properties that range from those of a wide-bandgap insulator to a semiconductor, a semimetal or metal. Monolayer transition metal dichalcogenides (TMDCs), a subclass of 2D layered materials, have promising optical characteristics such as efficient photoluminescence (PL), fast exciton decay, and high chemical and air stability. As a result, TMDCs have been used in various optoelectronic devices, showing distinct characteristics from conventional bulk semiconductors. For example, light emitting devices (LEDs) based on hexagonal boron nitrides (h-BN) insulators combined with TMDCs as the active luminescent materials have been demonstrated. However, the LEDs require a sequence of complex layer transfers during fabrication, and are constrained by the limited size of the 2D semiconductor flakes (several μm). Recently, a large area TMDC-based LED has been demonstrated, although its external quantum efficiency was low (?10?4%) compared to LEDs based on exfoliated TMDCs.
