Graphene Oxide-Enhanced Mixed-Structure Quasi-2D Perovskites for Stable Low-Threshold Amplified Spontaneous Emission

Abstract

Two-dimensional Ruddlesden−Popper (RP) phase perovskites show promise for facilitating stimulated emission due to their ambient stability and carrier confinement. However, these materials face challenges related to instability from high-density pumping and associated heating effects. This study presents quasi-2D perovskite films enhanced with graphene oxide (GO) and Dion−Jacobson (DJ) phase component, demonstrating improved thermal and photostability, and excellent amplified spontaneous emission (ASE) properties. To achieve optimal crystal orientation and a smooth surface of CsPbBr3 film for low-threshold ASE, octyl ammonium cations were employed, while 1,8-octane diammonium cations and GO significantly enhances stability. The addition of the DJ phase component and GO maintains the structural integrity of perovskite films even after 24 hours of heat treatment at 130 °C. Moreover, the composite films sustain a low ASE threshold of 21-25μJ cm−2 following annealing in ambient atmosphere. These results suggest that GO-added quasi-2D perovskites are promising for high-performance laser applications.