Publication date: 8th July 2026
Chemical engineering of heterostructure colloidal QDs has given rise to an unprecedented class of emissive materials for optoelectronic applications like photovoltaics, display and solid-state lighting. Although InP-based QDs show excellent performance in the green and red regions, it is highly challenging to access the blue range of 440-460 nm. The latter is technologically of utmost importance, in particular for the production of blue QD light-emitting diodes (QLEDs), which are required to realise electroluminescent pixels for next generation display technologies showing enhanced performance and reduced power consumption.
Chalcopyrite-type I-III-VI2 QDs emerged in the past 15 years as an alternative class of QD materials providing combined composition- and size-tuneable optical and electronic properties and opening up a novel space of compounds beyond well-established binary semiconductors. In particular CuInS2 and AgInS2 QDs have been studied most widely due to their efficient luminescence and possibility to synthesise them both in organic medium or in the aqueous phase. Changing the trivalent metal from In3+ to Ga3+ gives access to larger bandgap energies and hence allows for blue-shifting the emission peak. Although these QDs can show a decent PLQY, their broad PL line width due to an emission mechanism involving intra-bandgap trap states has been recognised as the major issue impeding their utilization in display applications, as these require narrowband emission to achieve a wide colour gamut. One way to reduce the line width is via the passivation of the surface with III2-VI3 shells such as Ga2S3 or In2S3 instead of ubiquitously used ZnS.
Here, we present the synthesis of AgGaS2/Ga2S3 (AGS/GS) core-shell QDs exhibiting narrow band-edge emission in the blue range around 450 nm [1]. Unexpectedly, we found that Ga2S3 itself can act as an efficient deep-blue emitter when overcoated with appropriate shell materials [2]. Finally, we will present our latest results on high-entropy alloyed halide perovskite nanocrystals, which upon functionalisation with zwitterionic ligands yield narrow blue emission with close-to-unity quantum yield and excellent photostability.
The authors thank the Labex ARCANE (ANR-11-LABX-0003-01). CEA-Leti is a member of the Carnot institute network. This work was supported by the French ANR via Carnot institute funding (grant ELECTRE).
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