posted on 2024-01-19, 22:33authored byFujun Zhang, Yingguo Yang, Yanbo Gao, Dingdi Wang, Weinan Dong, Po Lu, Xue Wang, Min Lu, Yanjie Wu, Ping Chen, Junhua Hu, Xuyong Yang, Donglei Zhou, Dali Liu, Lin Xu, Biao Dong, Zhennan Wu, Yu Zhang, Hongwei Song, Xue Bai
While
quasi-two-dimensional (quasi-2D) perovskites have good properties
of cascade energy transfer, high exciton binding energy, and high
quantum efficiency, which will benefit high-efficiency blue PeLEDs,
inefficient domain distribution management and unbalanced carrier
transport impede device performance improvement. Herein, (2-(9H-carbazol-9-yl)ethyl)phosphonic acid (2PACz) and methyl
2-aminopyridine-4-carboxylate (MAC) were simultaneously introduced
to a blue quasi-2D perovskite film. Relying on the synergistic effect
of 2PACz and MAC, it not only modulates the phase distribution inhibiting
the n = 2 phase but also greatly improves the electrical
property of the quasi-2D perovskite film. As a result, the as-modified
blue quasi-2D PeLED demonstrated an external quantum efficiency (EQE)
of 17.08% and a luminance of 10142 cd m–2. This
study exemplifies the synergistic effect among dual additives and
offers a new effective additive strategy modulating phase distribution
and building balanced carrier transport, which paves the way for the
fabrication of highly efficient blue PeLEDs.