Asia Pacific Physics Week 2024 (APPW2024)

Thursday, Nov. 7, 2024 

3:30 PM - 4:10 PM  Plenary Talk: Plenary Talk: Tae-Woo Lee (Seoul National University) 

Nanocrystalline Perovskites for High-Efficiency and Bright Next-Generation Displays

Tae-Woo Lee

Department of Materials Science and Engineering, Research Institute of Advanced Materials, Soft Foundry, Interdisciplinary Program in Bioengineering, Institute of Engineering Research, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea

Metal halide perovskites (MHPs) have emerged as promising candidates for next-generation vivid display technologies due to their exceptional color purity and tunable optoelectronic properties. This talk explores the unique benefits and advanced methods of using perovskite nanocrystals (PNCs) for enhancing the luminescence efficiency of perovskite light-emitting diodes (PeLEDs).

We present comprehensive material design strategies aimed at suppressing defect formation and improving PeLED performance. This includes innovative approaches such as doping guanidinium (GA) cations into formamidinium lead bromide (FAPbBr3) PNCs and overcoating with bromide-incorporated molecules to stabilize PNCs and passivate bromide vacancy defects, significantly enhancing the luminous efficiency of PeLEDs.1 Additionally, we highlight a modified bar-coating method capable of producing large-area PeLEDs with efficiencies comparable to those of small-area devices.2

Further advancements include the synthesis of advanced core/shell PNC structures, enabling PeLEDs with high efficiency, brightness, and stability simultaneously.3 We also introduce hybrid tandem PeLEDs with optimized optical structures that achieve near-perfect charge balance and superior outcoupling efficiency, resulting in PeLEDs with extremely high efficiency and narrow emission linewidth.4 Finally, the use of surface-binding conjugated molecular multipods to strengthen the perovskite lattice and reduce dynamic disorder has significantly improved the luminescent efficiency of PeLEDs.5 Besides, the novel perovskite-organic solid solution structure will be introduced that realize deep-blue emission PeLEDs.6

Acknowledgment: This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Ministry of Science and ICT (MSIT) (NRF-2016R1A3B1908431).

(1) Y.-H. Kim, S. Kim, A. Kakekhani, A. M. Rappe, T.-W. Lee et al., Nat. Photonics, 2021, 15, 148.

(2) Y.-H. Kim, J. Park, S. Kim, T.-W. Lee et al., Nat. Nanotechnol., 2022, 17, 590.

(3) J. S. Kim, J.-M. Heo, T.-W. Lee et al., Nature, 2022, 611, 688.

(4) H.-D. Lee, S.-J. Woo, S. Kim, T.-W. Lee et al., Nat. Nanotechnol., 2024, 19, 624.

(5) D.-H. Kim, S.-J. Woo, C. P. Huelmo, M.-H. Park, A. M. Rappe, T.-W. Lee et al., Nat. Commun., 2024, 15, 6245

(6) K.-Y. Jang, S. Y. Hwang, T.-W. Lee etal. Adv. Mater. 2024. 2404856