Cd-free Cu-doped ZnInS/ZnS Core/Shell Nanocrystals: Controlled Synthesis And Photophysical Properties.

Manpreet Kaur, Ashma Sharma, Murat Olutas, Onur Erdem, Akshay Kumar, Manoj Sharma, Hilmi Volkan Demir

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Article in Nanoscale research letters, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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7 authors.

Manpreet KaurDepartment of Nanotechnology, Sri Guru Granth Sahib World University, Punjab, 140406, India.

Ashma SharmaDepartment of Electrical and Electronics Engineering, Department of Physics, and UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, 06800, Ankara, Turkey.

Murat OlutasDepartment of Electrical and Electronics Engineering, Department of Physics, and UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, 06800, Ankara, Turkey.

Onur ErdemDepartment of Electrical and Electronics Engineering, Department of Physics, and UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, 06800, Ankara, Turkey.

Akshay KumarDepartment of Nanotechnology, Sri Guru Granth Sahib World University, Punjab, 140406, India.

Manoj SharmaDepartment of Nanotechnology, Sri Guru Granth Sahib World University, Punjab, 140406, India. m.sharma@ntu.edu.sg.ORCID http://orcid.org/0000-0001-5215-9740

Hilmi Volkan DemirDepartment of Electrical and Electronics Engineering, Department of Physics, and UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, 06800, Ankara, Turkey. hvdemir@ntu.edu.sg.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Here, we report efficient composition-tunable Cu-doped ZnInS/ZnS (core and core/shell) colloidal nanocrystals (CNCs) synthesized by using a colloidal non-injection method. The initial precursors for the synthesis were used in oleate form rather than in powder form, resulting in a nearly defect-free photoluminescence (PL) emission. The change in Zn/In ratio tunes the percentage incorporation of Cu in CNCs. These highly monodisperse Cu-doped ZnInS CNCs having variable Zn/In ratios possess peak emission wavelength tunable from 550 to 650 nm in the visible spectrum. The quantum yield (QY) of these synthesized Cd-free CNCs increases from 6.0 to 65.0% after coating with a ZnS shell. The CNCs possessing emission from a mixed contribution of deep trap and dopant states to only dominant dopant-related Stokes-shifted emission are realized by a careful control of stoichiometric ratio of different reactant precursors during synthesis. The origin of this shift in emission was understood by using steady state and time-resolved fluorescence (TRF) spectroscopy studies. As a proof-of-concept demonstration, these blue excitable Cu-doped ZnInS/ZnS CNCs have been integrated with commercial blue LEDs to generate white-light emission (WLE). The suitable combination of these highly efficient doped CNCs results led to a Commission Internationale de l'Enclairage (CIE) color coordinates of (0.33, 0.31) at a color coordinate temperature (CCT) of 3694 K, with a luminous efficacy of optical radiation (LER) of 170 lm/W

Indexed as

Cadmium freeColloidal quantum dotsColor propertiesCu dopingQuantum yieldWhite-light emission

Identifiers

PMID29916083

DOI10.1186/s11671-018-2599-x

PMCPMC6006007

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