Long-lived and Well-resolved Mn2+ Ion Emissions in CuInS-ZnS Quantum Dots

Cao, Sheng; Li, Chengming; Wang, Lin; Shang, Minghui; Wei, Guodong; Zheng, Jinju; Yang, Weiyou

doi:10.1038/srep07510

Cited by 67 publications

(81 citation statements)

References 49 publications

(80 reference statements)

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“…Several research groups have found that both the quaternary and d-dots were almost insensitive to temperature [61][62][63][64][65][66][67][68]. The temperature-dependent PL intensity was investigated to examine the thermal stability issue.…”

Section: Resultsmentioning

confidence: 99%

“…The introduction of transition metal ions into NCs with low intrinsic toxicity, such as Mn-and/or Cu-doped ZnSe and ZnS has been widely explored because of the unique optical properties of the doped NCs [61][62][63][64][65][66][67][68]. The doped NCs not only retain nearly all the advantages of intrinsic properties of NCs, but also possess new properties, such as enhanced thermal stability, reduced chemical sensitivity, and elimination of luminescent self-quenching and re-absorption.…”

Section: Introductionmentioning

confidence: 98%

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Large-scale synthesis of single-source, thermally stable, and dual-emissive Mn-doped Zn–Cu–In–S nanocrystals for bright white light-emitting diodes

Peng

Zhang

et al. 2015

Nano Res.

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Non-cadmium" dual emissive QDs have been directly synthesized using a one-pot hot-injection technique. A white LED was successfully fabricated using a commercial blue-LED chip combined with the optimal QDs. ABSTRACTThe global demand for resource sustainability is growing. Thus, the development of single-source environment-friendly colloidal semiconductor nanocrystal (NC) phosphors with broadband emission is highly desirable for use as color converters in white light-emitting diodes (WLEDs). We report herein the gram-scale synthesis of single-source, cadmium-free, dual-emissive Mn-doped Zn-Cu-In-S NCs (d-dots) by a simple, non-injection, and low-cost approach in one-pot fashion. This synthesis approach led to the formation of NCs with continuously varying compositions in a radial direction because the reactivity of precursors totally differed among these precursors. Consequently, d-dots exhibited two emission bands, one of which was due to Mn-related emissions and the other was due to the band edge of Zn-Cu-In-S NCs. Emission peaks assigned to band edge were tunable by simple control of particle size and composition. The prepared d-dots also exhibited the characteristic zero self-absorption, a quantum yield of 46%, and good thermal stability. A combination of a commercial blue LED chip with optimal d-dots as color converters gave a high color rending index of up to 90, Commission International de l'Eclairage color coordinates of (0.332, 0.321), and correlated color temperature of 5680 K. These results suggested that this cadmium-free, excellent thermally stable single-phase d-dot phosphor had potential applications in WLEDs. Nano Research DOI () Research Article| www.editorialmanager.com/nare/default.asp 2 Nano Res.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Large-scale synthesis of single-source, thermally stable, and dual-emissive Mn-doped Zn–Cu–In–S nanocrystals for bright white light-emitting diodes

Peng

Zhang

et al. 2015

Nano Res.

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“…8,30,31 The inset in Figure 1b gives the PL QY of the resultant QDs. 8,30,31 The inset in Figure 1b gives the PL QY of the resultant QDs.…”

Section: Synthesis and Optical Properties Of Mn 2+ -Doped Zn-in-s Qdsmentioning

confidence: 99%

“…It is reported that the intensities of the Mn 2+ -doped QDs significantly rely on the concentrations of Mn 2+ dopants. 31 If ZnS or InS nucleates separately, the corresponding absorption band edges should have various contour rather than gradually shift from ~350 to ~450 nm ( Figure 5). 22,27 However, the more In 3+ ion sites replaced by the Mn 2+ counterparts would result in the charge imbalance, which accordingly makes the PL intensity be decreased.…”

Section: Effect Of the Reaction Temperature And Amount Of Ode-s On Thmentioning

confidence: 99%

Mn²⁺-doped Zn–In–S quantum dots with tunable bandgaps and high photoluminescence properties

et al. 2015

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In the present work, we reported the synthesis of Mn 2+ -doped Zn-In-S quantum dots (QDs) with high optical performance in a controlled manner. The effects of the temperature, the introduced ODE-S amount and Zn/In ratios in the raw materials, as well as the Mn 2+ doping concentrations on the photoluminescence (PL) properties of Mn 2+ -doped Zn-In-S QDs were investigated systematically. The resultant QDs exhibit tunable bandgaps ranged from 2.9 to 3.7 eV, well-resolved Mn 2+ d-d emission with a PL quantum yield (QY) of 56 % and a surprisingly long excited state lifetime up to ~4.2 ms, suggesting their excellent PL properties. Meanwhile, the initial high PL QY of the obtained Mn 2+ -doped Zn-In-S QDs in organics solvent could be preserved very well once they were transferred into aqueous media via ligand exchange. Furthermore, the as-synthesized QDs exhibit an excellent thermal stability up to 200 o C in a crude solution.. desired to develop cadmium-free alloy QDs with tunable bandgaps to meet the versatile applications.As a typical II-III-VI semiconductor, the "green" chalcogenide Zn-In-S materials have been extensively applied in catalysis, charge storage, and thermoelectric energy conversion, due to its high chemical stability and composition tunable optical bandgaps. 23-25 Furthermore, Shen et al pointed out that doping transition metals such as Cu, Mn into ZnIn 2 S 4 host could further improve their photocatalytic activity. 26,27 However, to date, most reported works were mainly focused on the Zn-In-S microcrystalline, suggesting that there remain material-and fabrication-related obstacles to obtain the small and uniform Zn-In-S QDs. 23, 25, 28 Until recently, Peng et al reported the growth of ZnIn 2 S 4 QDs with tunable sizes ranged from 2.1 to 9.2 nm and a high photocatalytic activity. 28 More recently, Zhang et al reported the optical properties of Cu doped Zn-In-S QDs, showing a high PL quantum yield (QY)and a composition-tunable PL emission over the entire visible spectral window and extending to the near-infrared spectral range. 29 However, to the best of our knowledge, little attention has been paid to the Mn 2+ -doped Zn-In-S NCs.Herein, we reported the growth of cadmium-free Mn 2+ -doped Zn-In-S QDs with high PL via a multi-step hot-injection strategy. The influences of various experimental variables on the growth and PL of the QDs, including the nucleation temperatures for the Mn:ZnInS core nanocluster, the amount of octadecene ODE-S, the Zn/In ratios, as well as Mn 2+ dopant concentration-dependent optical properties, 14 PL intensities increase rapidly and approach the highest one at ODE-S of 0.2 mmol, and then reduce with the further increase of ODE-S. In principle, when the S precursor is used in large excess, the cationic precursor should be consumed rapidly, and small-sized stable Mn:ZnInS nanoclusters would be the resultant products. On the other hand, the presence of additional excessive amount of ODE-S may result in the S-rich surface of the obtained Mn 2+ -doped Zn-In-S QDs, which allows the...

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“…10,11,12,13 Nevertheless, the energy conversion efficiency of solar cells using CZTS still lags behind that for I-III-VI 2 and has not seen improvement over 12 % in recent years. 14 19,20,21,22,23 This method of alloying shifts the material's band gap beyond the useful solar absorption region and thereby diminishes their suitability in solar cells. 24 Moreover, Ga and Al analogues of these alloys have not been reported.…”

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confidence: 99%

A new family of wurtzite-phase Cu₂ZnAS_4−x and CuZn₂AS₄ (A = Al, Ga, In) nanocrystals for solar energy conversion applications

et al. 2016

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A new family of quaternary semiconductors Cu2ZnAS4-x and CuZn2AS4 (A = Al, Ga, In) has been synthesized in the form of wurtzite phase nanocrystals for the first time. The nanocrystals can be converted to the stannite phase via thermal annealing under a N2 atmosphere. A direct band gap in the visible wavelength region combined with a high absorption cross-section makes these materials promising for solar energy conversion applications.

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Long-lived and Well-resolved Mn2+ Ion Emissions in CuInS-ZnS Quantum Dots

Cited by 67 publications

References 49 publications

Large-scale synthesis of single-source, thermally stable, and dual-emissive Mn-doped Zn–Cu–In–S nanocrystals for bright white light-emitting diodes

Large-scale synthesis of single-source, thermally stable, and dual-emissive Mn-doped Zn–Cu–In–S nanocrystals for bright white light-emitting diodes

Mn²⁺-doped Zn–In–S quantum dots with tunable bandgaps and high photoluminescence properties

A new family of wurtzite-phase Cu₂ZnAS_4−x and CuZn₂AS₄ (A = Al, Ga, In) nanocrystals for solar energy conversion applications

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Long-lived and Well-resolved Mn2+ Ion Emissions in CuInS-ZnS Quantum Dots

Cited by 67 publications

References 49 publications

Large-scale synthesis of single-source, thermally stable, and dual-emissive Mn-doped Zn–Cu–In–S nanocrystals for bright white light-emitting diodes

Large-scale synthesis of single-source, thermally stable, and dual-emissive Mn-doped Zn–Cu–In–S nanocrystals for bright white light-emitting diodes

Mn2+-doped Zn–In–S quantum dots with tunable bandgaps and high photoluminescence properties

A new family of wurtzite-phase Cu2ZnAS4−x and CuZn2AS4 (A = Al, Ga, In) nanocrystals for solar energy conversion applications

Contact Info

Product

Resources

About

Mn²⁺-doped Zn–In–S quantum dots with tunable bandgaps and high photoluminescence properties

A new family of wurtzite-phase Cu₂ZnAS_4−x and CuZn₂AS₄ (A = Al, Ga, In) nanocrystals for solar energy conversion applications