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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.
ISSN: 1931-7573
Rights: © 2018 The Author(s). Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, 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
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