AgInS2–ZnS nanocrystals: Evidence of bistable states using light‐induced electron paramagnetic resonance and photoluminescence |
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| Authors: | Sónia S. Nobre Olivier Renard Christian Lombard Théo Chevallier Brigitte Pépin‐Donat Gilles Le Blevennec |
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| Affiliation: | 1. Laboratoire d'Innovation pour les Technologies des Energies Nouvelles et les Nanomatériaux, Département de Technologie des Nano‐Matériaux, Service d'Elaboration de Nanomatériaux, Laboratoire de Synthèse et Intégration des Nanomatériaux, CEA‐Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France;2. Laboratoire Structure et Propriétés d'Architecture Moléculaire, (UMR 5819) CEA‐CNRS – UJF/INAC/CEA‐Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France |
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| Abstract: | The precursor (AgIn)x Zn2(1–x)(S2CN(C2H5)2)4 was used to prepared AgInS2–ZnS nanocrystals with different compositions (x = 0.4 and x = 0.7) and with different time of reaction (10 min and 75 min). The photoluminescence features of the nanocrystals were addressed by combining steady‐state spectroscopy and light‐induced electron paramagnetic resonance. Both techniques showed the contribution of at least two components for the emission, previously assigned to surface and intrinsic states. Light‐induced electron paramagnetic resonance allowed detection of the photocreation both of irreversible paramagnetic species that are likely responsible for the nano‐crystals degradation assigned to surface states and of reversible paramagnetic species assigned to intrinsic states. Moreover, reversible bistable paramagnetic states were observed. This Letter provides a scheme that might be useful in addressing the well‐known problem of aging of the nanocrystals. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
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| Keywords: | nanocrystals photoluminescence electron paramagnetic resonance |
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