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

Yasir A. Haleem; Qiumei Di; Bing Bai; Meng Xu; Wenxing Chen; Jiajia Liu; Jia Liu; Hongpan Rong; Jiatao Zhang

doi:10.1039/c9tc04997e

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

Yasir A. Haleem, Qiumei Di, Bing Bai, Meng Xu, Wenxing Chen, Jiajia Liu, Jia Liu, Hongpan Rong, Jiatao Zhang^*

^*Corresponding author for this work

Beijing Institute of Technology

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

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 Se^2-). The intrinsic defect sites were generated because of the bonding termination at the surface of the nanosheets. A complex formed by the Cd-interstitial (Cd_i-V_Cd) 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.

Original language	English
Pages (from-to)	13849-13858
Number of pages	10
Journal	Journal of Materials Chemistry C
Volume	7
Issue number	44
DOIs	https://doi.org/10.1039/c9tc04997e
Publication status	Published - 2019

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

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.",

author = "Haleem, {Yasir A.} and Qiumei Di and Bing Bai and Meng Xu and Wenxing Chen and Jiajia Liu and Jia Liu and Hongpan Rong and Jiatao Zhang",

note = "Publisher Copyright: {\textcopyright} 2019 The Royal Society of Chemistry.",

year = "2019",

doi = "10.1039/c9tc04997e",

language = "English",

volume = "7",

pages = "13849--13858",

journal = "Journal of Materials Chemistry C",

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T1 - Two-dimensional CdX (X = Se, Te) nanosheets

T2 - controlled synthesis and their photoluminescence properties

AU - Haleem, Yasir A.

AU - Di, Qiumei

AU - Bai, Bing

AU - Xu, Meng

AU - Chen, Wenxing

AU - Liu, Jiajia

AU - Liu, Jia

AU - Rong, Hongpan

AU - Zhang, Jiatao

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

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U2 - 10.1039/c9tc04997e

DO - 10.1039/c9tc04997e

M3 - Article

AN - SCOPUS:85075081202

SN - 2050-7526

VL - 7

SP - 13849

EP - 13858

JO - Journal of Materials Chemistry C

JF - Journal of Materials Chemistry C

IS - 44

ER -

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

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