Self‐Amplified Photon Guiding in the Luminescent Organic Semiconductor Nanowires

Abstract Organic semiconductor nanocrystals are important building blocks for miniaturized room‐temperature optoelectronic and excitonic devices, benefitting from their large oscillator strength, high quantum yield, and large exciton binding energy. Specifically, 1D organic semiconductor nanowires have been widely studied with promising applications such as nanoscale light sources and optical waveguides. Although both amplified spontaneous emission and lasing have been well demonstrated in organic semiconductor nanowires under pulsed laser excitation, amplification of guided photons during propagation along the nanowire has been rarely investigated. Here, a highly polarized luminescent organic semiconductor nanowire with self‐amplified photon guiding capability under continuous‐wave laser excitation is reported. The nanowire waveguide itself functions as a gain medium to provide optical gain during its photoluminescence propagation, with the value of gain depending on temperature and excitation laser power. This research reveals the optical gain effect in the organic semiconductor waveguide system, which paves the way for on‐chip energy‐efficient photonic communications.