Degradation Studies of Colloidal Quantum Dot Light-Emitting Diodes

Abstract

The degradation mechanism of CdSe/ZnS quantum dots (QDs) light-emitting diodes (LEDs) was investigated with steady-state and time-resolved photoluminescence measurements. Our study reveals that the degradation is associated with the decreasing quantum efficiency of the CdSe/ZnS QDs in the devices. Two mechanisms that cause the efficiency reduction were verified in the experiments: i.e., thermal instability and luminescence quenching.

Photostimulated control of luminescence quantum yield for colloidal Ag2S/2-MPA quantum dots

“…In a number of studies, manifestations of photostimulated degradation of QD luminescence intensity were detected. 8–13 Random blinking of luminescence of single quantum dots was also demonstrated. 14–16 Such unwanted parasitic effects in the QD luminescence strongly limit the development of many advanced applications, including those associated with single-photon light sources for quantum informatics.…”