Investigation on Stability of Cesium Lead Bromide quantum dots

Abstract: Monodisperse colloidal quantum dots of fully inorganic cesium lead bromide CsPbBr3 are synthesised at two distinguished temperatures (120 and 180oC) using inexpensive commercial precursors. The stability of these quantum dots is studied under three different conditions by measuring absorption as well as photoluminescence as functions of time. For both kinds of quantum dots, the light affect their stability while temperature is not an important factor. Quantum dots with low synthesis temperature does not have a clear cubic phase compared to the ones with higher synthesis temperature. Another property that we think might happen for only low temperature synthesised quantum dots is forming of bigger quantum dots through a shrinking-expanding process.