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The use of UV light sources is highly relevant in many fields of science,being directly related to all those detection and diagnosis procedures whichare based on fluorescence spectroscopy. Depending on the specific application,UV light-emitting materials are desired to feature a number of opto-mechanicalproperties, including brightness, optical gain for being used in laser devices,flexibility to conform with different lab-on-chip architectures, and tailorablewettability to control and minimize their interaction with ambient humidity andfluids. In this work, we introduce multifunctional, UV-emitting electrospunfibers with both optical gain and anisotropic hydrophobicity greatly enhancedcompared to films. Fibers are described by the onset of a composite wettingstate and their arrangement in uniaxial arrays further favours liquiddirectional control. The low gain threshold and optical losses, the plasticnature and the flexibility and stability of these UV-emitting fibers make theminteresting for building light-emitting devices and microlasers. Furthermore,the found anisotropic hydrophobicity is strongly synergic with opticalproperties, reducing interfacial interactions with liquids and enabling smartfunctional surfaces for droplet microfluidic and wearable applications.

Multifunctional polymer nanofibers: UV emission, optical gain, anisotropic wetting and high hydrophobicity for next flexible excitation sources