Publication date: 15th December 2025
Colloidal quantum dots (QDs) in the visible spectral range have become key materials for next-generation displays, particularly III–V indium phosphide (InP) and II–VI ZnSeTe-based core–shell nanocrystals. These systems provide tunable, high-purity emissions while avoiding the toxicity concerns of cadmium-based QDs. Despite their promise, conventional synthetic routes often suffer from broad size distributions and interfacial trap states that limit photoluminescence quantum yield (PLQY) and color purity.
Our group has recently demonstrated that precise reaction-kinetic control in a two-step growth process enables the formation of highly monodisperse InP cores. Coupled with rationally designed ZnSeS/ZnS multishell passivation, these structures achieve PLQYs exceeding 90% and ultra-narrow full width at half maximum (FWHM) values (<33 nm) for both green and red emission. In parallel, we have advanced ZnSeTe alloyed QDs, which allow fine tuning of band structure and lattice strain, enabling high-efficiency blue quantum dots through controlled Te incorporation and optimized core/shell compositions.
Beyond synthesis, we developed direct optical patterning strategies using photoacid generators and carbene-based crosslinkers that enable sub-micron resolution patterning without damaging the QD surfaces. This approach is fully compatible with both InP and ZnSeTe QDs and is critical for high-resolution QLED pixels and micro-LED color-conversion layers.
Finally, I will discuss integration of these high-quality QDs into QLED device architectures, focusing on charge-balance engineering, interfacial defect suppression, and efficiency roll-off mitigation. This talk will highlight our recent progress in visible-range III–V and ZnSeTe QD synthesis, direct patterning, and QLED device implementation toward environmentally friendly, high-performance display technologies.
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