Proceedings of MATSUS Fall 2024 Conference (MATSUSFall24)
Publication date: 28th August 2024
Micro light-emitting diodes (LEDs) have been considered as the next generation of displays, offering advancements in resolution, brightness and response time[1], [2]. As green and blue micro LEDs have demonstrated high performance with size reduced to below 10 µm, the focus has turned to red micro LEDs, which show serious size-dependent efficiency droop due to the formation of sidewall defects[3]-[5]. Previous studies have attempted to reduce nonradiative recombination centers through sidewall passivation, but the maximum external quantum efficiencies (EQEs) achieved for red micro LEDs were only 5.25% and 5.02% with pixel diameters of 50 and 25 µm, respectively[6], limiting their applications in full-color displays.
Metal-halide perovskites have received great attention as promising materials for achieving efficient and bright micro LEDs due to their high photoluminescence quantum efficiency (PLQE), high charge mobility and easy solution processing [7]-[10]. Additionally, the intrinsic polycrystalline nature of perovskite films inherently limits their charge diffusion length. This characteristic is beneficial for micro LEDs as it helps mitigate the impact of sidewall defects[11], [12]. There have been some attempts to achieve red perovskite micro LEDs using inkjet printing and screen printing methods[13], [14]. However, these methods result in low EQEs below 1% with pixel diameters of 45 and 20 µm, respectively. This is mainly due to the lack of a compact and uniform film with high PLQE, which is crucial for efficient micro LEDs. Here, we demonstrate the fabrication of efficient red perovskite micro LEDs using a simple spin-coating process on patterned substrate. By introducing zinc acetate into the
perovskite precursor solution, we facilitate the formation of uniform perovskite films with low defects, leading to the realization of efficient red micro LEDs with a peak EQE of 8.6% and a pixel diameter of 20 µm.
This work is financially supported by the National Key Research and Development Program of China (2022YFA1204800), the National Natural Science Foundation of China (52233011, 62288102, 62375124, 52372138), Practice Innovation Program of Jiangsu Province (KYCX22_1295).
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