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I-III-VI2 semiconductor nanocrystals as remote color converting alternatives for white LEDs

Book Contribution - Book Abstract Conference Contribution

Colloidal I-III-VI2 semiconductor nanocrystals form a versatile family of nanomaterials with similar properties as Cd-containing quantum dots (QDs), but with lower toxicity. Their interesting and tunable optical properties have resulted in their use in a variety of applications, ranging from biolabeling over solar cells to white LEDs. For an optimal performance each of these applications requires the QDs to show specific optical properties. The relatively narrow emission of Cd-based QDs can easily be tuned over the visible range at a high chemical yield by adjusting specific synthesis conditions. However, the typical broad emission of chalcopyrite nanocrystals has proven to be more challenging to tune and requires a different strategy. We propose a study on the one-pot synthesis and characterization of colloidal chalcopyrite nanocrystals with efficient and broad emission. A careful preparation of the precursors and control of the reaction time is required to synthesize Cu-In-Zn-S nanocrystals reproducibly. We discuss the limited emission tuning obtained by changing reaction conditions and composition tuning, where In can for instance be replaced by Ga. Finally, we address the potential of the resulting materials as alternative color convertors for white LEDs in lighting and displays by means of a demonstration device.[1] Speranskaya et al., Langmuir, 2014, 30, 7567;[2] S. Abe et al., ACS Nano, 2012, 6, 42;[3] P.F. Smet et al., J. Electrochem. Soc., 2011, 158, R37
Book: E-MRS Spring meeting, Abstracts
Number of pages: 1
Publication year:2015