  Chemiphores are entities, which exhibit wide-band light emission without any
external light source but just due to the chemical reaction resulting in the
chemiluminescence effect. Since the chemiphores usually have low quantum
efficiency, chemiluminescence is a weak optical effect. We found that plasmonic
nanoparticles can efficiently enhance the peculiar effect of chemiluminescence
due to the acceleration of the radiative decay of the chemiphore excited state
which, in turn, enlarges the chemiluminescence yield. Correspondingly,
plasmonic nanoparticles are nanoparticles with sub-wavelength sizes
experiencing the absorption band in specific wavelength which are characterized
by unique optical properties, as well as high localization of electromagnetic
radiation. However, the broadband properties of plasmonic nanoparticles and
their implications in liquid light, the chemiluminescence effect, is
overlooked. Therefore, they can attract attention as novel materials for
photonics, sensing, and forensic science. Here, fabrication techniques of
broadband plasmonic nanoparticles are reported, and their interesting optical
properties together with their applications in chemiluminescence effect are
discussed, as well. We fabricated the nanoparticles with laser ablation in
liquids (LAL) technique and propose the physical vapor deposition (PVD)
synthesis with annealing-assisted treatment for further studies. Both
techniques are accessible and allow production of ensembles of nanoparticles
having shape and size distributions to exhibit broad plasmonic resonance which
fit the wide-band emission of a chemiphore. Our results, in particular, a
specific design for plasmonic nanoparticles placed on the dielectric material,
lead the way toward a new generation of chemiluminescence-based devices
starting from sensing, healthcare, biomedical research and quantum systems such
as pump-free laser sources.
