Blue Emission From Charge Transfer Excitons in Hybrid Organic-Inorganic Quantum Wires: (ABT) [PbCl3]

Organic–inorganic hybrid (OIH) materials have the potential of providing synergetic properties and promising novel optical properties. This work focuses on the charge-transfer (CT) excitons which play a critical role in a new OIH material, with formula (C7H7N2S) [PbCl3] abbreviated as ABTPbCl3. Its crystal structure is built up from edge-sharing [PbCl6] octahedra, forming one-dimensional infinite double chains surrounded by 2-aminobenzothiazole (ABT) organic molecules. The density of states calculations demonstrate that ABTPbCl3 has a type-II band alignment, where the valence band and conduction band of the inorganic wires lie upon those of the organic component, respectively. Under UV excitation, the photoluminescence spectrum of ABTPbCl3 shows a band emission centered at 483 nm. Based on the band alignment, we attribute this bluish emission to CT excitons, which have a lifetime of 5.64 ns. The carrier dynamics is investigated by measuring the luminescence spectra as a function of temperature. At tempera...