Full-color plasmonic random lasers for wearable applications

Wearable sensors have garnered significant attention in the field of health-related device development due to their excellent optical and mechanical properties. A simple and cost-effective exfoliation manufacturing technique is employed to create full-color random lasers enhanced by plasmonic effects for customized wearable sensors. The polymer random laser is composed of a polyethylene glycol-based adhesive matrix, which integrates RhB, uranine, S420, and silver nanowires (Ag NWs) to form flexible thin-film devices via spin-coating. RhB, uranine, and S420 serve as the gain media, while Ag NWs provide plasmonic-enhanced feedback. Under optical excitation, we achieved low threshold, narrow linewidth, and stable emission from the plasmonic random laser. More importantly, through the clever manipulation of the gain film composition, we successfully generated monochromatic, dichromatic, and full-color emission across seven distinct laser outputs, with a color gamut coverage superior to the standard sRGB. Furthermore, the polymer film underwent flexibility and biocompatibility testing, with results showing that the device remains highly stable and resistant to interference even under the complex conditions of skin cream contact. This work proposes a preparation strategy that combines design flexibility with simplicity, providing an approach for the development of wearable full-spectrum light-emitting lasers.