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Four efficient artificial light-harvesting systems have been developed in the present work. They assemble sodium dodecyl sulphate (SDS) with organic small molecule chromophores to synthesize microcrystals to mimic chlorophyll. In microcrystals, the chromophores are ordered through intermolecular dipole-dipole interactions, which results in efficient energy transfer. In the D-2/A-2 light-harvesting system, the donor concentrates excitation energy from 500 chromophores into a single acceptor with a relative high energy transfer efficiency (86%) and an antenna efficiency (33). The microcrystals exhibit high energy harvesting performance and act as an ideal framework for artificial light-harvesting systems. We have developed four light-harvesting systems (LHSs) using microcrystals composed of organic small molecule chromophores to mimic chlorophyll. In microcrystals, the chromophores are ordered through intermolecular dipole-dipole interactions, which results in efficient energy transfer. [Display omitted] • Four efficient LHSs have been developed using nanocrystals composed of organic chromophores to simulate chlorophyll. • The nanocrystals were co-assembled with the donor and accepter at a controlled ratio with rod-like structures. • In the nanocrystals, the chromophores were highly ordered through dipole-dipole interactions between molecules. • The LHS showed a high energy transfer efficiency (89%) and a high antenna efficiency (33). [ABSTRACT FROM AUTHOR]

Light harvesting is one of the fundamental steps in photosynthesis, and developing artificial light harvesting systems (LHSs) with high energy transfer efficiency is still a challenging task. Herein, we designed and constructed a novel fluorescent tetragonal Pd(II)-metallacycle (DDPH-Pd) as a new platform for the construction of artificial LHSs. 6,15-bis(pyridine)-9,12-bis(dodecyloxy)-substituted benzo[5]helicene (DDPH) and ethylenediamine palladium nitrate were coordinated to generate self-assembled DDPH-Pd. Carmosine and Nile red were chosen as acceptors due to their good spectral overlap with that of DDPH-Pd , which is essential for fabricating light-harvesting system. The artificial LHSs show good energy transfer efficiency (61%) and antenna efficiency (5.0) in Carmosine@ DDPH-Pd with a 50:1 donor/acceptor ratio. [Display omitted] • The new fluorescent metallacycles is assembled by the bipyridine ligand DDPH and ethylene-diamine palladium nitrate. • Amphipathic metallacycles further aggregate in water to form nano spheres. • The Pd(II)-metallacycles are used as a new platform for the construction of artificial light harvesting systems. • LHSs have good energy transfer efficiency (61%) and antenna efficiency (5.0) with donor/acceptor ratio of 50:1. [ABSTRACT FROM AUTHOR]