Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/86304
Title: Cd-free Cu-doped ZnInS/ZnS core/shell nanocrystals : controlled synthesis and photophysical properties
Authors: Kaur, Manpreet
Sharma, Ashma
Olutas, Murat
Erdem, Onur
Kumar, Akshay
Sharma, Manoj
Demir, Hilmi Volkan
Keywords: Cadmium Free
Colloidal Quantum Dots
Issue Date: 2018
Source: Kaur, M., Sharma, A., Olutas, M., Erdem, O., Kumar, A., Sharma, M., et al. (2018). Cd-free Cu-doped ZnInS/ZnS core/shell nanocrystals : controlled synthesis and photophysical properties. Nanoscale Research Letters, 13, 182-.
Series/Report no.: Nanoscale Research Letters
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/Wopt and a color rendering index (CRI) of 88.
URI: https://hdl.handle.net/10356/86304
http://hdl.handle.net/10220/45237
ISSN: 1931-7573
DOI: http://dx.doi.org/10.1186/s11671-018-2599-x
Rights: © 2018 The Author(s). Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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