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Chemiphores are entities, which exhibit wide-band light emission without anyexternal light source but just due to the chemical reaction resulting in thechemiluminescence effect. Since the chemiphores usually have low quantumefficiency, chemiluminescence is a weak optical effect. We found that plasmonicnanoparticles can efficiently enhance the peculiar effect of chemiluminescencedue to the acceleration of the radiative decay of the chemiphore excited statewhich, in turn, enlarges the chemiluminescence yield. Correspondingly,plasmonic nanoparticles are nanoparticles with sub-wavelength sizesexperiencing the absorption band in specific wavelength which are characterizedby unique optical properties, as well as high localization of electromagneticradiation. However, the broadband properties of plasmonic nanoparticles andtheir implications in liquid light, the chemiluminescence effect, isoverlooked. Therefore, they can attract attention as novel materials forphotonics, sensing, and forensic science. Here, fabrication techniques ofbroadband plasmonic nanoparticles are reported, and their interesting opticalproperties together with their applications in chemiluminescence effect arediscussed, as well. We fabricated the nanoparticles with laser ablation inliquids (LAL) technique and propose the physical vapor deposition (PVD)synthesis with annealing-assisted treatment for further studies. Bothtechniques are accessible and allow production of ensembles of nanoparticleshaving shape and size distributions to exhibit broad plasmonic resonance whichfit the wide-band emission of a chemiphore. Our results, in particular, aspecific design for plasmonic nanoparticles placed on the dielectric material,lead the way toward a new generation of chemiluminescence-based devicesstarting from sensing, healthcare, biomedical research and quantum systems suchas pump-free laser sources.

Broadband plasmonic nanoparticles: fabrication, optical properties, and implications in liquid light chemiluminescence enhancement