Temperature-dependent photoluminescence and lasing properties of CsPbBr3 nanowires

Abstract

Exploring the exciton-phonon interaction of cesium lead bromide (CsPbBr3) perovskite nanowires (NWs) is not only important to the fundamental understanding of phonon-assisted carrier dynamics but also critical for the development of high performance miniaturized light sources. Herein, we systematically investigated the temperature (T) dependent spontaneous emission (SE) and lasing spectra of chemical vapor deposited CsPbBr3 NWs. We demonstrated that both the SE and the lasing energy were mainly determined by two facts: the electron-phonon interaction (EP) and the lattice thermal expansion (TE). The lattice TE effect plays a key role at T ∼ 78-170 K, therefore both the lasing and SE peaks exhibit a nearly linear blueshift with increasing T. As T > 195 K, the EP interaction becomes dominant, which reduces the blueshift rate of the SE peak and causes a redshift of lasing peaks. These findings will further advance the understanding of the exciton-phonon interaction and the T-dependence of emission properties of lasers and related optoelectronic devices.