Stimulated emission from CsPbBr3 quantum dot nanoglass

Abstract

We report on a high-temperature vapor drop-casting technique used to fabricate a chemically stable nanomaterial‒CsPbBr3 quantum dot nanoglass that exhibits stable photoluminescence and stimulated emission properties. Such nanomaterial is comprised of two material domains: nano-fractured glassy-phase matrix and embedded CsPbBr3 quantum dots. The nanoglass is compatible with various pump sources to attain a low-threshold stimulated emission via either linear or nonlinear pump schemes. We demonstrate that the pump threshold could be remarkably reduced when the pump wavelength shifts from the peak position of the photoluminescence excitation spectrum to the photoluminescence peak. In addition, the lowest pump threshold achieved in the two-photon pump regime is comparable to that ever-reported lowest value using colloidal CsPbBr3 quantum dots. Cooperative contributions from local disorders on both of the pump beam and the emitted light are proposed to account for the observed stimulated emission properties.