Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
Publication date: 16th December 2024
Quantum dots (QDs) are a new generation of semiconductor materials with great potential in many device applications, such as light-emitting diodes and photodetectors. III-V core/shell quantum dots mainly InP-based are promising environmentally benign QDs whose emission can be modified from blue to near-infrared by controlling the size of the core and shell thickness and composition. High quantum yield, photostability, narrow emission bandwidth, biocompatibility, chemical stability, and environmental friendliness make them desirable for real-life applications. Despite that, some challenges are still remaining such as broad emission line widths or expanding the emission range of InP/ZnS quantum dots into the blue region while maintaining high quantum efficiency which is important for the display application and LED manufacturing. We explore novel approaches to achieve blue-emitting InP-based core/shell QDs suitable for display applications. To go towards an emission range of 450-470 nm, the InP QDs need to be extremely small (around 1.5 nm), which poses synthetic challenges. Therefore, either the QD growth conditions have to be tuned to obtain very small InP cores or the bandgap has to be widened via alloying, e.g., with ZnS. In any case, it is highly challenging to achieve narrow emission linewidths as the InP QDs are in the strong quantum confinement regime where small diameter changes induce large changes in the bandgap energy. We found a reproducible way to produce highly emissive InP-based QDs with a PL peak cantered at 470 nm. To enhance their chemical and photostability, they were coated with an outer alumina shell. Stability tests were conducted by depositing QD thin films on functionalized glass substrates, which were then submitted to continuous irradiation with a solar simulator. These tests confirm the beneficial effect of the alumina shell for enhancing the stability of the blue-emitting QDs. The latter will be included in QLED structures and their potential for photocatalytic applications will be studied in ongoing research.
We acknowledge support from CEA, ST Microelectronics, the European Union's Horizon research and innovation program under grant agreement n° 101135704 (HortiQD) and from Samsung SAIT (Equinox).
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