Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
The embedding of colloidal quantum dots (QDs) into composite materials under preservation of long-term stability and photoluminescence quantum yield is a challenging task for applications as color conversion materials, lighting or displays.
Opposed to the commonly used incorporation into polymers, Otto et al. described the embedding of QDs into ionic salt matrices, resulting in an even higher increase of the photo- and chemical stability and processability while preserving the strong luminescence of the embedded QDs.[1] However, the current used methods are time consuming and suffer from ligand exchange procedures.[1-4]
Herein, we present a direct incorporation method of highly-emitting, oil-based QDs into various ionic matrices using a material property known from sample preparation for IR‑spectroscopy, namely cold flow. This behavior is well-known for “soft” ionic salts, e.g. KCl, KBr, CsI, NaCl, AgCl, which under pressure (about 2.2 GPa) feature cold flow. Using this versatile technique, we are able to adjust the QD concentration up to very high loadings, to control the size and thickness of the resulting crystallite, and the type of matrix material. In addition, this fast and simple approach does not require a ligand exchange procedure and is applicable to a broad range of QD systems.
[1] T. Otto, M. Müller, P. Mundra, V. Lesnyak, H. V. Demir, N. Gaponik, A. Eychmüller, Nano Lett. 2012, 12, 5348–5354.
[2] M. Müller, M. Kaiser, G. M. Stachowski, U. Resch-Genger, N. Gaponik, A. Eychmüller, Chem. Mater. 2014, 26, 3231–3237.
[3] M. Adam, T. Erdem, G. M. Stachowski, Z. Soran-Erdem, J. F. L. Lox, C. Bauer, J. Poppe, H. V. Demir, N. Gaponik, A. Eychmüller, ACS Appl. Mater. Interfaces 2015, 7, 23364–23371.
[4] M. Adam, Z. Wang, A. Dubavik, G. M. Stachowski, C. Meerbach, Z. Soran-Erdem, C. Rengers, H. V. Demir, N. Gaponik, A. Eychmüller, Adv. Funct. Mater. 2015, 25, 2638–2645.
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