Engineering Core Size of InP Quantum Dot with Incipient ZnS for Blue Emission

Blue indium phosphide quantum dot (InP QD) is an emerging colloidal semiconductor nanocrystal, considered as a promising next-generation photoactive material for light-emitting purposes. Despite the tremendous progress in blue InP QDs, synthetic method tailoring core size to realize blue-emissive QDs still lags behind. This work suggests blue-emitting by engineering with incipient ZnS (i-ZnS) shell. The formation of i-ZnS complexes, before tris(trimethylsilyl)phosphine injection (e.g., growth process), restrains overgrowth nuclei rapidly forming shell on its surface, thereby resulting further dwarfed cores. With additional coating, exhibit photoluminescence yield ?52% at 483 nm. origin bandgap diminution increase thickness, or utilization ZnSe unraveled via first-principles density functional theory simulations. Simulational evidence InP-core densification along accompanying changes chemical and structural properties, presented. QD device shows maximum luminance 1162 cd m?2 external efficiency 1.4%.