Abstract
We have measured polarized absorption and photoluminescence (PL) spectra of an organic-inorganic semiconductor single crystal, C 10 H 7 CH 2 NH 3 PbI 3 , at low temperatures down to 5 v; K. The temperature and time dependences of the PL intensities have been measured. From these results, it is concluded that quasi-1D excitons are photogenerated in the PbI 3 chain, and some of them are transferred to a triplet exciton in the organic and the others are relaxed to a self-trapped exciton in the PbI 3 chain. The triplet exciton, however, is not transferred to the self-trapped exciton. The lifetimes of the triplet exciton and the self-trapped exciton are estimated to be 1.2 v; ms and 52 v; ns, respectively, at low temperature range, and the former and the latter thermal activation energies are obtained as 9.7 v; meV and 18 v; meV, respectively.
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