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Issue 8, 2018
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Rod-shaped Zn–Ag–In–Te nanocrystals with wavelength-tunable band-edge photoluminescence in the near-IR region

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Abstract

Rod-shaped nanocrystals (NCs) composed of ZnTe–AgInTe2 solid solution ((AgIn)xZn2(1−x)Te2, ZAITe) were synthesized in a 1-dodecanethiol solution. The resulting ZAITe NCs of 4–5 nm in width and 16–18 nm in length showed exciton peaks in the absorption spectra, regardless of their composition. The energy gap was enlarged from 1.2 to 1.6 eV by decreasing the x value of the NCs from 1.0 to 0.25. A sharp photoluminescence (PL) peak was observed in each PL spectrum of the NCs with x values of 1.0–0.5, assignable to band-edge emission, while NCs with x = 0.25 showed an additional broad PL peak originating from the defect sites due to the increased non-stoichiometry of NCs. With a decrease in x from 1.0 to 0.25, the band-edge PL peak was blue-shifted from 1010 to 809 nm in the near-IR region, accompanied by a decrease in the corresponding PL quantum yield from 47% to 0.07% due to the diminution of radiative recombination rate.

Graphical abstract: Rod-shaped Zn–Ag–In–Te nanocrystals with wavelength-tunable band-edge photoluminescence in the near-IR region

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Publication details

The article was received on 07 Dec 2017, accepted on 21 Jan 2018 and first published on 22 Jan 2018


Article type: Paper
DOI: 10.1039/C7TC05624A
Citation: J. Mater. Chem. C, 2018,6, 2034-2042
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    Rod-shaped Zn–Ag–In–Te nanocrystals with wavelength-tunable band-edge photoluminescence in the near-IR region

    T. Kameyama, K. Sugiura, Y. Ishigami, T. Yamamoto, S. Kuwabata, T. Okuhata, N. Tamai and T. Torimoto, J. Mater. Chem. C, 2018, 6, 2034
    DOI: 10.1039/C7TC05624A

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