Publication date: 8th July 2026
For next-generation QD-based displays relying no longer on colour conversion (photoluminescence) but on electrically driven active pixels (electroluminescence), nanocrystals emitting in the three primary colours R,G,B are required. InP-based core/shell quantum dots represent a highly promising environmentally-benign alternative to Cd-based QDs for the green and red range.
However, achieving narrow emission in the blue range (460-480 nm) is highly challenging with this material because the InP QDs are in the strong quantum confinement regime, where small changes in diameter induce significant fluctuations in the bandgap. Here, we explore a novel synthetic scheme, giving access to ultrasmall (around 1.3 nm) InP core QDs and their overgrowth with a thick ZnS shell (8 monolayers) in a single step, leading to highly luminescent InP/ZnS QDs emitting around 470 nm, albeit with a comparably broad linewidth of 60 nm (FWHM). With the goal to reduce the latter, interfacial treatment with different zinc halides is performed, which results in a slight size increase from around 7 to 8 nm, lower size distribution and higher circularity of the particles.
In the case of ZnF2, a strongly enhanced excitonic peak at 434 nm with a peak-to-valley ratio rising from 1.2 to 1.8 is achieved, despite the fact that XPS analysis still reveals significant oxidation of the InP core, induced through side reactions of the zinc carboxylate precursor during the shell growth. Based on temperature-dependent PL studies in a 75-400 K range, we show that the influence of exciton-phonon coupling on the ensemble PL linewidth is negligible as compared to the broadening induced by the core QD size distribution. Finally, the potential of the obtained QDs for incorporation into QLED structures will be discussed.
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