Luminance Efficiency Roll-Off Mechanism In Cspbbr3-Xclx Mixed-Halide Perovskite Quantum Dot Blue Light-Emitting Diodes

Efficiency roll-off is a significant issue in blue light-emitting diodes (LEDs), but its origin still remains controversial. We report CsPbBr3-xClx/PbBry (or PbCly) (core/shell) quantum dot LEDs exhibiting the emission peak spanning from lambda(peak) = 492 to lambda(peak) = 435 nm by varying the Cl composition (0 <= x <= 2.21). PLQY and EQE significantly decreased with the increase of the Cl composition. Careful analyses of the composition and the energy structure using EL, PL, TRPL, UPS, XPS and STEM-EDX measurements reveal that the luminance efficiency roll-off in CsPbBr3-xClx LEDs is attributed to the following three combined effects: (1) luminescence quenching by the non-radiative trap-assisted recombination, (2) the hole transfer process at the CsPbBr3-xClx/PbBry core/shell, and (3) imbalanced charge injection caused by a high energy barrier for the hole conduction at the PVK/QD heterointerface (Delta h ').