Metal Halide Perovskite Nanocrystals for Advanced Display Technologies

Metal halide perovskites (MHPs) have gained recognition as potential candidates for next-generation display technologies, given their high color purity, cost-effectiveness, and facile processing attributes. While several techniques have been pursued to magnify their luminescence performance and stability, they have not yet eclipsed the benchmarks set by conventional organic or inorganic quantum dot-based LEDs. In this talk, we will delve into the unique advantages and strategies involved in MHPs for display technologies using meticulously designed nanomaterials. First would be a comprehensive material strategy aimed at inhibiting defect generation in atomically precise colloidal perovskite nanocrystals (PNCs), thereby elevating their luminescent efficiency. By incorporating guanidinium (GA⁺) cations into formamidinium lead bromide (FAPbBr₃) PNCs, we could achieve a significant surge in luminous efficiency coupled with decreased amount of defect sites. [1] In addition, the incorporation of the bromine-incorporating molecule, 1,3,5-tris(bromomethyl)-2,4,6-triethylbenzene (TBTB), effectively addressed the halide vacancies. In terms of scalable manufacturing, we have pioneered a modified bar-coating process capable of producing large devices on par with the efficiencies of spin-coated counterparts at small device size. [2] In-situ type of core/shell PNC synthesis methodology on substrate will also be discussed, which facilitated the realization of perovskite LEDs with high efficiency, brightness, and stability at the same time. [3] By fragmenting large 3D crystals into nanoscale counterparts and surrounding them using covalently-bonded compact acidic organic ligands, we achieved outstanding charge confinement without compromising charge mobility. Collectively, these advancements underscore the potential of MHPs as the vanguard of self-emissive display materials.<br/> <br/>1. Y.-H. Kim et al., Nat. Photon., 15, 148–155 (2021)<br/>2. Y.-H. Kim et al., Nat. Nanotechnol., 17, 590–597 (2022)<br/>3. J. S. Kim et al., Nature, 611, 688–694 (2022)