1 research outputs found
Self-Stabilized Quasi-2D Perovskite with an Ion-Migration-Inhibition Ligand for Pure Green LEDs
Perovskite light-emitting diodes (PeLEDs) have recently
achieved
a great breakthrough in external quantum efficiency (EQE). However,
the operational stability of pure primary color PeLEDs lags far behind
because of serious ion migration. Herein, a self-stabilized quasi-2D
perovskite is constructed with a strategically synthesized ion-migration-inhibition
ligand (IMIligand) to realize highly stable and efficient
pure green PeLEDs approaching the standard green light of Rec. 2020.
The IMIligand takes the role to not only eliminate migration
pathways and anchor halide ions to suppress the ion migration but
to also further enhance the crystalline orientation and energy transfer
in quasi-2D perovskites. Meanwhile, the self-stabilized quasi-2D perovskite
overcomes the degradation of electrical performance caused by conventional
exogenous passivation additives. Ultimately, the figure of merit of
the pure green quasi-2D PeLEDs is at least double that of previous
works. The devices achieve an EQE of 26.2% and operational stability
of 920 min at initial luminance of 1000 cd m–2