Fig. 4: Device performance of distribution controlled quasi-2D perovskite LEDs.
From: Suppressing phase disproportionation in quasi-2D perovskite light-emitting diodes
a Device architecture. PVSK indicates the quasi-2D perovskites investigated in this work. b, c Current density-voltage-radiance (J-V-R) curves (b) and EQE characteristic (c) of quasi-2D perovskite LEDs. d EL spectra under forward biases of 4, 5, 6, 7 and 8 V. Inset is a photograph of a working device. e Histogram of EQEs measured from 70 devices, which gives an average value of 22.9% and a relative standard deviation of 6.9%. f Simulated fractional power distribution in the LED structure as a function of emission wavelength. g Operational stability measurement of quasi-2D perovskite LEDs based on different ligands without encapsulation, performed in nitrogen filled glove box at a constant current density of 0.1 mA/cm2. h Operational stability of PPT device under various current densities.
