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High-Performance Blue Perovskite Light-Emitting Diodes Enabled by Synergistic Effect of Additives

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journal contribution
posted on 2024-01-19, 22:33 authored by Fujun 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.

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