One-step Synthesis of UV-Curable CsPbX3 (X = Cl, Br, and I) Nanocrystal Inks for Printing

Abstract

<p>Metal halide perovskite nanocrystals (NCs) have garnered significant attention due to their captivating optoelectronic properties. One promising application for these materials is their use as color-conversion layers (CCLs) in blue micro-LED technology, enabling the realization of full-color displays. Nonetheless, a pivotal challenge revolves around producing efficient luminescent perovskite inks and subsequently employing them for inkjet printing finely patterned CCLs. In this study, a straightforward single-step hot-injection method is introduced for synthesizing inks comprising CsPbX₃ NCs, where X represents Cl, Br, and I, or mixed halide systems such as Cl/Br and Br/I. Through precise composition control, the emission spectra can be effortlessly adjusted across the entire visible spectrum, spanning from 410 to 710 nm. The resulting CsPbX₃ NCs exhibit narrow emission line-widths, ranging from 21 to 39 nm, an expansive color gamut encompassing up to 130% of the National Television Standards Committee color standard, and exceptional quantum yields reaching up to 100%. With their superb optical performance, facile synthesis procedure, and robust stability, these CsPbX₃ NCs emerge as highly suitable candidates for their use as CCLs with blue light-emitting devices deployed as backlights.<br></p>