High-efficiency core-shell or core-shell mimicked perovskite emitters and light-emitting diodes
Tae-Woo Lee a, Joo Sung Kim a, Hobeom Kim a, Jung-Min Heo a, Min-Ho Park a
a Department of Materials Science and Engineering, Seoul National University, School of Chemical and Biological Engineering, Research Institute of Advanced Materials, Institute of Engineering Research, Nano Systems Institute (NSI), BK21 PLUS SNU Materials Division for Educating Creative Global Leaders, Seoul National University, Seoul 08826, Republic of Korea
nanoGe Perovskite Conferences
Proceedings of International online conference on Hybrid materials and optoelectronic devices (HYBRIDOE)
Online, Spain, 2020 December 15th - 17th
Organizers: Xueqing Xu, Baomin Xu, Hin-Lap (Angus) Yip and Xinhua Zhong
Keynote, Tae-Woo Lee, presentation 034
DOI: https://doi.org/10.29363/nanoge.hybridoe.2020.034
Publication date: 4th December 2020

Metal halide perovskite materials have been emerged as promising candidate for next-generation light emitter with various advantages including high color purity with FWHM (Full width at half maximum) of ~20nm, easy color tunability, high charge-carrier mobility, solution processability, and low material cost. However, perovskite light-emitting diodes (PeLEDs) showed poor electroluminescence (EL) efficiency at room temperature because of its intrinsically low exciton binding energy. Here, we present high-efficiency PeLEDs using various strategies to overcome the EL efficiency limitations of PeLEDs. We suggest that the efficiency in PeLEDs can be increased by realizing core/shell structured perovskites, which can decrease the grain size and passivate the surface traps of perovskite grains. By introducing organic-shielded nanograin engineering method, organic conducing materials could surround the perovskite grains in form of core/shell structure to maximize the EL efficiency (current efficiency = 87.35 cd/A). Also, new strategies to improve efficiency and operational stability of PeLEDs were applied by assembling 2D perovskites as shell for 3D bulk perovskites. Realization of the 3D/2D core/shell structure could successfully suppress the ion migration in perovskite materials, extending the operational lifetime ~15 times and extremely suppressing abnormal luminance overshoot in PeLEDs.

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