期刊
ADVANCED OPTICAL MATERIALS
卷 11, 期 13, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202202056
关键词
hygroscopic polymers; light-emitting nanofibers; nanofiber networks; nanofibers; optical gain; stimuli-responsive materials; thermo-responsive polymers
This study reports on switchable optical gain based on arrays of thermo-responsive poly(2-n-propyl-2-oxazoline) nanofibers. The nanofibers exhibit light amplification and high humidity absorption capability. Waveguiding analysis reveals that the switching mechanism is caused by moisture sorption swelling-induced morphological changes. These responsive light-emitting nanofibers have potential applications in dynamically-controlled lasers, environmentally-switchable optoelectronics, and smart sensors.
The development of intelligent photonic systems made of stimuli-responsive materials, i.e., with features tunable and switchable by environmental signals, is gaining increasing attention. Here, the study reports on switchable optical gain based on complex arrays of nanofibers made of thermo-responsive poly(2-n-propyl-2-oxazoline), incorporating a blue-emitting chromophore. The fluorescent component endows the nanofibers with optical gain in addition to the moisture absorption capability of the polymer. Light amplification is found with temperature- and humidity-dependent excitation threshold. The threshold value is halved close to the polymer cloud point temperature, enabling reversible switching of the emission intensity upon temperature change. Waveguiding analysis by back-focal plane imaging on individual fibers allows the switching mechanisms to be rationalized, in terms of moisture sorption swelling-induced morphological changes. These responsive light-emitting nanofibers may find application in a novel class of lasers with dynamically-controlled properties, environmentally-switchable optoelectronics, and smart sensors.
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