Quasi-Two-Dimensional Perovskite Nanosheets Based on the Triplet Energy Acceptor Molecule with Pure Green Emission Light

Quasi-two-dimensional hybrid perovskites have proved to be promising next-generation semiconductor materials for light-emitting diodes and photovoltaic applications. However, these materials usually contain a mixture of phases that their photoluminescence is not monochrome. Here, we synthesize a series of quasi-two-dimensional organic-inorganic hybrid perovskite nanosheets (NSs) with the triplet energy acceptor molecule naphthalene methylamine (NMA), that is, (NMA)(2)(MA)(< n-1 >)Pb < n > Br3 < n >+1 (NMA = C11H9NH3, < n > = 2,3,4). It was found that with the organic layer, the light color of the NSs is pure green on account of energy transfer from the inorganic layer whose band gap is beyond triplet states of NMA (similar to 2.6 eV). Also, we demonstrated that the triplet energy transfer lifetime is similar to 7 ps for the < n > = 2 and similar to 9 ps for the < n > = 3 quasi-two-dimensional hybrid perovskite NSs by spectroscopy.

Automated summary

Quasi-two-dimensional hybrid perovskites show promise for use in light-emitting diodes and photovoltaic applications. By introducing the acceptor molecule naphthalene methylamine, the emission color of the perovskite nanosheets was tuned to pure green, with energy transfer lifetime around 7-9 picoseconds for different dimensions.