Efficient Metal Halide Perovskite Nanocrystals for Next-Generation Vivid Displays

Metal halide perovskites (MHPs) have emerged as promising candidates for future display technologies, primarily due to their superior high color purity. This talk will delve into the unique advantages and strategies of utilizing MHPs for display technologies, focusing on innovative nanostructures and material design approaches in precisely tailored colloidal perovskite nanocrystals (PNCs) to maximize luminous efficiency of perovskite light-emitting diodes (PeLEDs). First, we will introduce comprehensive material strategies aimed at suppressing defect generation, leading to the enhancement of the luminescent efficiency of PNCs. More specially, we incorporated zero-dipole guanidinium cation into formamidinium lead bromide (FAPbBr₃) PNCs and utilized interlayer based on bromide-incorporated molecules. We also developed a modified bar-coating technique capable of producing large-area PeLEDs that match the efficiency of the PeLEDs with a small emission area. Additionally, we'll present an advanced core/shell PNC synthesis method, enabling to demonstration of simultaneously bright, efficient, and stable PeLEDs. Moreover, we will explore a novel hybrid tandem PeLEDs with an ideal optical structure that emits light more efficiently with a narrow bandwidth. Finally, we incorporated conjugated molecular multipods that reduce the dynamic disorder of perovskite, resulting in significantly improved luminescent efficiency of PeLEDs. These advancements highlight the potential of MHPs as promising materials for next-generation vivid displays.<br/><br/><b>Reference</b><br/>[1] Y.-H. Kim, S. Kim, A. Kakekhani, J. Park, J. Park, Y.-H. Lee, H. Xu, S. Nagane, R. B. Wexler, D.-H. Kim, S. H. Jo, L. Martínez-Sarti, P. Tan, A. Sadhanala, G.-S. Park, Y.-W. Kim, B. Hu, H. J. Bolink, S. Yoo, R. H. Friend, A. M. Rappe, T.-W. Lee, <i>Nat. Photonics</i> <b>2021</b>, <i>15</i>, 148.<br/>[2] Y.-H. Kim, J. Park, S. Kim, J. S. Kim, H. Xu, S.-H. Jeong, B. Hu, T.-W. Lee, <i>Nat. Nanotechnol.</i> <b>2022</b>, <i>17</i>, 590.<br/>[3] J. S. Kim, J.-M. Heo, G.-S. Park, S.-J. Woo, C. Cho, H. J. Yun, D.-H. Kim, J. Park, S.-C. Lee, S.-H. Park, E. Yoon, N. C. Greenham, T.-W. Lee, <i>Nature</i> <b>2022</b>, <i>611</i>, 688.<br/>[4] H.-D. Lee, S.-J. Woo, S. Kim, J. Kim, H. Zhou, S. J. Han, K. Y. Jang, D.-H. Kim, J. Park, S. Yoo, T.-W. Lee, <i>Nat. Nanotechnol.</i> <b>2024</b>, <i>19</i>, 624.<br/>[5] D.-H. Kim, S.-J. Woo, C. P. Huelmo, M.-H. Park, A. M. Schankler, Z. Dai, J.-M. Heo, S. Kim, G. Reuveni, S. Kang, J. S. Kim, H. J. Yun, J. Park, J. Park, O. Yaffe, A. M. Rappe, T.-W. Lee, <i>Nat. Commun.</i> <b>2024</b>, doi: 10.1038/s41467-024-49751-7.