Publication date: 8th January 2019
Recently, perovskite based light-emitting diodes (PeLEDs) have been reported where different compositions were used to enhance the device performance and tune the emission color [1-3]. Consequently, the external quantum efficiency has increased to 20% [4]. However, there are not many studies that focus on the device lifetime. In order to make PeLEDs suitable for the display market, the issue of stability has to be addressed.
In this work, we investigate the mechanisms that determine the operational lifetime of three-dimensional perovskite emitters. We prepare and study methylammonium lead bromide based (MAPbBr3) efficient PeLEDs under continuous current and pulsed current driving conditions. The results show a substantial improvement in device operational lifetime when biased under pulsed driving conditions. We discuss the results in terms of the possible degradation mechanisms, i.e. ionic motion and joule heating. We also extend our study on systems using mixed cation perovskites by adding cesium into the MAPbBr3 lattice which shows improved thermal stability.
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