Fig. 4: Device performance of different ligands synthesized CsPbI3 QDs.
From: Stable and efficient CsPbI3 quantum-dot light-emitting diodes with strong quantum confinement
a The energy level diagram of light-emitting diodes (LED) devices. b The normalized electroluminescence (EL) spectrum of oleic acid/oleylamine (OA/OAm) and 2-naphthalenesulfonic acid hexafluorophosphate (NSA-NH4PF6) QDs based LEDs. c The emission chromaticity diagram of LEDs is based on NSA-NH4PF6 QDs, with CIE coordinates of (0.691, 0.308). d J-V and L-V curves of different QDs based LEDs. e external quantum efficiency (EQE) versus current density (J) curves of different QDs based LEDs, inset shows a photo of the device lit at the voltage corresponding to the maximum brightness. f The operational stability of different QDs based LEDs.
