Narrow-Bandwidth I–III–VI Semiconductor Nanocrystals: Synthesis, Luminescence and Applications in Quantum-Dot Light-Emitting Diodes

I-III-VI semiconductor nanocrystals (NCs) have emerged as promising candidates in quantum-dot light-emitting diodes (QLEDs) due to their environmental-benign nature and capability for large-scale tunable emission as well as straightforward synthesis. However, the photoluminescence (PL) emission of I–III–VI type NCs, as reported in numerous studies, exhibits a broader full width at half maximum (FWHM), adversely affecting their color purity. This review delineates the advancements in the development of narrow-bandwidth I–III–VI NCs, focusing on their synthesis strategies, luminescence mechanisms, and applications in QLEDs. It concludes with a discussion on the challenges confronting narrow-bandwidth I–III–VI-based QLEDs and outlines potential strategies for improving device performance.