Ionic transition-metal complex (iTMCs)-based electro-luminescent nanofibers (TELFs) are developed by using coelectrospinning. A single TELF consist of a Galistan liquid metal core (cathode), an ITMC-based polymer shell, and an ITO thin film coating (anode). Lights emitted from the TELFs can be detected by a CCD camera at 42 V and seen by naked eyes at 5.6 V In nitrogen. The TELFs are structurally self-supporting but do not require a physical substrate (generally relatively bulky and heavy) to support them, rendering one-dimensional light sources more flexible, lightweight, and conformable. This technology can be beneficial to many research and development areas such as optoelectonic textile, bioimaging, chemical and biological sensing, high-resolution microscopy, and flexible panel displays, particularly as ITMCs with emission at different wavelengths are available.