Optical Properties of Cd-Alloyed CsPbBr3 Nanorods

One-dimensional semiconductor nanorods (NRs) have been widely used for various high-performance optoelectronic applications, but their optical properties are still not fully revealed. In this work, we have studied the optical properties of Cd-alloyed perovskite NRs, i.e., CsPb0.2Cd0.8Br3. On the basis of careful analysis of the temperature-dependent photoluminescence (PL) data, it is found that Cd-alloyed NRs exhibit strong electron–phonon coupling strength. As a consequence, fast hot carrier cooling time is observed in the alloyed NRs. In addition, compared with the reported bare CsPbBr3 NRs, reduced Auger lifetime and two-photon absorption (2PA) are observed in the alloyed NRs. As a result, the Cd-alloyed perovskite NRs may be not promising for the application in two-photon pumped amplified stimulated emission. These new findings may deepen the understanding of the optical properties in the Cd-alloyed perovskite NRs.