Optical properties of a quantum wire crystal, C5H10NH2PbI3

We report optical properties of a single crystal of C5H10NH2PbI3, which can be considered as arrays of 0.4 nm thick quantum wires isolated by organic barrier materials. The lowest exciton absorption band is located at 3.3 eV and mainly polarized along the wire direction, while the photoluminescence band is located at 2.1 and 0.3 eV wide. The large Stokes shift (1.2 eV) and the broad width suggests the strong exciton-lattice interaction in this one-dimensional crystal. The luminescence decays single exponentially in time, and the time constant decreases with temperature, ranging from 15 mu s at 13 K to 32 ns at 250 K.