Publication date: 15th December 2025
Halide perovskite quantum dots (QDs) have emerged as a promising material for optoelectronic devices in different fields comprising light harvesting, emission or detection. Adding to the well-established potential of conventional inorganic QDs originating in their quantum confinement properties, halide perovskite QDs present additional features such as a compositionally tunable bandgap across the visible spectrum, near unity quantum yield or fast photoluminescence to name but a few. [1] While many of these exciting features are usually reported for isolated QDs, most real-life devices will demand the incorporation of QDs into an assembly that, for some applications, permit charge injection/extraction and therefore some degree of electronic coupling. In this work we present a study of the photophysical properties of halide perovskite QD films in two different configurations representing widespread synthetic approaches. The conclusions from this study allow us to unveil the way energy migration takes place in this kind of systems and extract conclusions regarding the applicability of each configuration in different fields.
On the one hand, QD films made from ligand-free QDs grown within the pores of nanoporous metal oxide matrices are considered. In this system changing the amount of perovskite precursor in the matrix allows tuning the average inter-QD separation and thus its electronic coupling. 2,3] We demonstrate a transition from a system of isolated excitonic emitters to an interconnected QD array presenting a recombination regime between excitonic and free-carrier systems. [2] Such changes in connectivity drastically influence the properties of the QD ensemble from the emission quantum yield to the cooling of photoexcited carriers. [4]
Finally, we explore how the presence of organic ligands in state-of-the-art QDs fabricated by means of the widely extended hot injection method affect the interaction among QDs. In particular, we perform temperature dependent time-resolved PL measurements that evidence how the photophysical properties of these QD films in the presence of organic ligands can be described through a combination of trap passivation, photonic effects and energy transfer. [5]
HM is thankful for the financial support of the Spanish Ministry of Science and Innovation under grant PID2020-116593RB-I00, funded by MCIN/AEI/10.13039/501100011033, and of the Junta de Andalucía under grant P18-RT-2291 (FEDER/UE). HM, JFGL, and DOT acknowledge financial support from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No 956270 (Persephone). ARSK acknowledges the start-up funds provided by Wake Forest University and funding from the Center for Functional Materials and the Office of Research and Sponsored Programs at WFU. MVK acknowledges funding from the Swiss National Science Foundation (Project "Novel inorganic light emitters: synthesis, spectroscopy and applications," Grant Agreement No. 188404).
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