Tunable emission properties of core-shell ZnCuInS-ZnS quantum dots with enhanced fluorescence intensity

doi:10.1016/j.jmst.2017.07.014

Abstract

Abstract:

Cadmium-free I-III-VI quantum dots (QDs), represented by Cu-In-S (CIS), are widely investigated for their non-toxicity and tunable emission properties. In this work, Zn-Cu-In-S (ZCIS) alloyed QDs were synthesized via a solvothermal approach by heating up a mixture of the corresponding metal precursors and sulphur powder with dodecanethiol in oleylamine media, and the fluorescent intensity was greatly enhanced by coating ZnS (ZS) shell. By changing the ratio of Cu, the as prepared ZCIS-ZS QDs showed composition-tunable photoluminescent (PL) emission over the visible spectral window from about 500 nm to 620 nm, which is much wider than that of CIS QDs. Moreover, the influence of excitation wavelength, reaction temperature and time on the optical properties of the ZCIS-ZS QDs was also studied. This research provides a feasible and simple approach to prepare ZCIS-ZS QDs with large tunable spectral range on visible region, which could greatly contribute to the development of potential applications due to their non-toxicity and excellent optical properties.

Key words: Emission property, ZnCuInS, Quantum dots, Fluorescence intensity

Yihe Jia, Haicheng Wang, Long Xiang, Xiaoguang Liu, Wei Wei, Ning Ma, Dongbai Sun. Tunable emission properties of core-shell ZnCuInS-ZnS quantum dots with enhanced fluorescence intensity[J]. J. Mater. Sci. Technol., 2018, 34(6): 942-948.

Figures/Tables 8

Fig. 1. XRD patterns (a, c) and TEM images (b, d) of ZCIS (a, b) and ZCIS-ZS (c, d) QDs.

Fig. 2. Electronic binding energy of XPS narrow scan spectra of Cu 2p (a), In 3d (b), Zn 2p (c) and S 2p (d), respectively.

Fig. 3. UV-vis/PL spectra of ZCIS (a) and ZCIS-ZS (b) QDs, comparison of PL (c) and normalized PL (d) of ZCIS and ZCIS-ZS QDs.

Fig. 4. PL decay curves of ZCIS (a) and ZCIS-ZS (b) QDs under excitation wavelength 470 nm.

Table 1 Decay times and amplitude constant ratios of PL emission for ZCIS and ZCIS-ZS QDs.

Sample	τ₁ (ns)	A₁ (%)	τ₂ (ns)	A₂ (%)
ZCIS	8.703	18.803	39.480	81.197
ZCIS-ZS	37.685	10.692	201.626	89.308

Fig. 5. UV-vis (a, c) and corresponding normalized PL (b, d) spectra of ZCIS (a, b) and ZCIS-ZS (c, d) QDs with different ratios of Cu/(Zn + In).

Fig. 6. PL (a, c) and corresponding normalized PL (b, d) spectra of ZCIS (a, b) and ZCIS-ZS QDs (c, d) with different excitation wavelength.

Fig. 7. PL spectra of ZCIS (a) and ZCIS-ZS (b) QDs under different reaction temperatures with fixed reaction time of 10 min and 20 min, respectively, PL spectra (c) and normalized PL spectra (d) of ZCIS QDs under different reaction times with fixed reaction temperature of 220 °C.

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