Fig. 6From: Effect of a Rubidium Chloride Carrier Confinement Layer on the Characteristics of CsPbBr3 Perovskite Light-Emitting DiodesDiagram of the energy levels for a structure 2 and b structure 3. c Electroluminescence (EL), d current density, e luminescence, and f external quantum efficiency of CsPbBr3 perovskite LEDs with and without RbCl layers. The inset in (c) shows a photo of an operating LEDBack to article page