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Issue 44, 2019
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Two-dimensional CdX (X = Se, Te) nanosheets: controlled synthesis and their photoluminescence properties

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Abstract

Two-dimensional (2D) CdX (X = Se, Te) nanosheets are potential candidates for novel optoelectronic applications. Herein, oleic acid (OA), stearic acid (SA) and typical Cd precursors were chosen to synthesize high-quality 2D CdX nanosheets. Their unique absorption (or excitation) and photoluminescence (PL) properties were studied. The PL profiles are differentiated as band-edge and trap-state PL. These trap-states emanated from the intrinsic surface defect sites (Cd2+ or Se2−). The intrinsic defect sites were generated because of the bonding termination at the surface of the nanosheets. A complex formed by the Cd-interstitial (Cdi–VCd) acts as a donor–acceptor pair according to the Prener–Williams model and is accountable for the large Stokes-shifted trap-state PL peak. Our experimental findings imply that these surface trap-states follow the configurational coordinates model. Inevitably, the PL dynamics of CdSe nanosheets depend strongly on the surface trap-states in addition to their size and shape.

Graphical abstract: Two-dimensional CdX (X = Se, Te) nanosheets: controlled synthesis and their photoluminescence properties

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Publication details

The article was received on 10 Sep 2019, accepted on 07 Oct 2019 and first published on 10 Oct 2019


Article type: Paper
DOI: 10.1039/C9TC04997E
J. Mater. Chem. C, 2019,7, 13849-13858

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    Two-dimensional CdX (X = Se, Te) nanosheets: controlled synthesis and their photoluminescence properties

    Y. A. Haleem, Q. Di, B. Bai, M. Xu, W. Chen, J. Liu, J. Liu, H. Rong and J. Zhang, J. Mater. Chem. C, 2019, 7, 13849
    DOI: 10.1039/C9TC04997E

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