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The controlled covalent functionalization of semiconducting single-walledcarbon nanotubes (SWCNTs) with luminescent sp$^{3}$ defects leads to additionalnarrow and tunable photoluminescence features in the near-infrared and evenenables single-photon emission at room temperature, thus strongly expandingtheir application potential. However, the successful integration ofsp$^{3}$-functionalized SWCNTs in optoelectronic devices with efficient defectstate electroluminescence not only requires control over their emissionproperties but also a detailed understanding of the impact of functionalizationon their electrical performance, especially in dense networks. Here, wedemonstrate ambipolar, light-emitting field-effect transistors based onnetworks of pristine and functionalized polymer-sorted (6,5) SWCNTs. Weinvestigate the influence of sp$^{3}$ defects on charge transport by employingelectroluminescence and (charge-modulated) photoluminescence spectroscopycombined with temperature-dependent current-voltage measurements. We find thatsp$^{3}$-functionalized SWCNTs actively participate in charge transport withinthe network as mobile carriers efficiently sample the sp$^{3}$ defects, whichact as shallow trap states. While both hole and electron mobilities decreasewith increasing degree of functionalization, the transistors remain fullyoperational, showing electroluminescence from the defect states that can betuned by the defect density.

Charge Transport in and Electroluminescence from sp$^{3}$-Functionalized Carbon Nanotube Networks