The dual-band organic photodetectors (OPDs) detect incoming light selectively in two different bands. This work demonstrates a bias-switchable dual-band OPD, achieving a fast-switching speed of over 1000 times per second and a −3 dB cutoff frequency of > 100 kHz for high-speed optical communications in two distinct bands, e.g., near-infrared (NIR) and visible light. Visible-blind NIR detection with a high responsivity of 435 mA W–1 is realized for the OPDs operated under a small reverse bias of −1.0 V. NIR-blind visible light detection with a responsivity of 325 mA W–1 is obtained for the OPDs operated under a low forward bias of 1.0 V. Dual-channel NIR/visible optical communication technique has been demonstrated, providing an opportunity for a plethora of applications in information electronics and the Internet-of-Things.
Scopus Subject Areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- optical communication
- organic photodetectors