| Summary: | 碩士 === 國立臺北科技大學 === 分子科學與工程系有機高分子碩士班 === 107 === Random lasers (RLs) is well known for its convenience, tunability, and applicability in laser fields. It simplifies the traditional laser device by replacing a resonant cavity with light scattering which creates the prospect of a laser device. Many studies recently focused on how to enhance scattering effect and lower laser thresholds, such as adding metal nanoparticles, nanofibers, stretchable substrate, and multiple laminations. However, the deep influence of fluorescence lifetime with scattering enhancement and nanofibers embedded with various shape of silver nanoparticles are still absent. In this research, we observed non-radiative and radiative recombination and light scattering changes in distinct condition such as films, fibers and with a distinct appearance of silver nanoparticles to prove the localized surface plasmon resonance (LSPR) which may influence the presentation of random lasers. Not only the disorder nanofibers provide most of scattering factors, but the conductivity of Ag-NPs facilitates the performance of fibers and nanoparticles were also considered as a medium to scatter light. Moreover, the lower fluorescence lifetime optically characterized using Time-Resolved Photoluminescence (TR-PL), are relative to scattering enhancement from nanofibers which hasn’t been reported. We presented the Polyvinyl alcohol (PVA) nanofibers with Ag-NPs via electrospinning doping Pyrromethene 597 (PM597) and comparing to films and different shape of Ag-NPs which perform lower 35% threshold and shorter 68.5% PL lifetime, which broadens our horizon in sensing device and application. Finally, we also applied it on to the backlight displays and produced the white LED (WLED) with distinct thickness of nanofibers.
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