As hydrogen-like bosonic quasiparticles, excitons can act as an intermediary between electrons and photons. Thereby elements and devices operating with excitons have special advantages on energy consumption, processing speed and integration, which can be expected to meet the demand of ultra-low power and high-speed integrated devices in the future information field. Meanwhile, owing to quantum confinement effect, reduced dielectric screening, enhanced Coulomb interactions and large exciton binding energy, two-dimensional materials can provide an ideal platform for developing excitonic devices at room temperature. Limited by the ultrashort lifetime and low carrier mobility, the long-range directional transport and corresponding ultrafast dynamics of excitons become a critical science problem in the frontier of excitonic devices.