Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
Publication date: 16th December 2024
Quantum dots (QDs) exhibit unique tunability in their optical properties, making them highly suitable for engineering light-emitting devices [1,2]. Achieving tunable broadband electroluminescence represents a significant milestone for QD-based LEDs, enabling diverse applications ranging from energy-efficient lighting to displays and medical devices [3].This work investigates the integration of prefabricated QDs with distinct optical activity across different spectral regions to produce a broad emission spectrum (480–900 nm) resembling white light [4]. Specifically, by combining CsPbBr3, CuInS2, and PbS QDs—emitting at 503 nm, 675 nm, and 876 nm, respectively—we demonstrate the feasibility of achieving white-light emission in colloidal dispersions. Moreover, initial results suggest that this method can be extended to thin-film light-emitting diodes (LEDs) with a single emissive layer, opening new possibilities for next-generation optoelectronic devices. We also analyze energy transfer phenomena, such as radiative reabsorption and re-emission, occurring between QDs with overlapping spectra. These insights shed light on energy transfer dynamics and their influence on device performance. Overall, these findings present a promising approach for white-light generation using QDs, paving the way for efficient and customizable solid-state lighting solutions.
We acknowledge the financial support from the European Research Council (ERC) through Consolidator Grant (818615-MIX2FIX).
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