Highly Luminescent Mn-Doped ZnS Nanocrystals: Gram-Scale Synthesis

Srivastava, Bhupendra B.; Jana, Santanu; Karan, Niladri S.; Paria, Sayantan; Jana, Nikhil R.; Sarma, D. D.; Pradhan, Narayan

doi:10.1021/jz100378w

Cited by 201 publications

(202 citation statements)

References 20 publications

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“…The variation in emission efficiency should be ascribed to the formation of ZnS shell on the surface of NCs with increased reaction temperature as shown in Figure 3. This observation on improvement of PL QY of NCs by using ZnS shell had been confirmed in some other Mn-doped core/shell systems [86][87][88][89][92][93][94][95][96]. Above 240 °C, the dopant PL intensity started to decrease, whereas the band gap PL peak position still slightly shifted to longer wavelength along with a broader PL band.…”

Section: Resultssupporting

confidence: 62%

“…According to previous reports, the dopant concentration had been found to be one of the most key factors affecting the PL QY of doped NCs, which has been reported by several research groups [86,[92][93][94][95][96]. To study the influence of the Mn ions concentration on PL properties of d-dots, a series of d-dots samples with different nominal (Mn/Zn) ratios (from 1.0% to 5.0%) were prepared while keeping the other experimental variables fixed.…”

Section: Resultsmentioning

confidence: 82%

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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: Resultssupporting

confidence: 62%

Section: Resultsmentioning

confidence: 82%

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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“…The hyperfine constant (A) value of 68 gauss suggests that Mn has been doped in a cubic lattice field in CIZS nanocrystals. 27 The same has also been observed for Mn-doped AIZS. However, the broadness of the peak rather than the six clear hyperfine splittings is expected due to the complex environment of the Mn in the presence of copper or silver.…”

supporting

confidence: 65%

Mn-Doped Multinary CIZS and AIZS Nanocrystals

Manna

Jana

Bose

et al. 2012

J. Phys. Chem. Lett.

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102

121

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Multinary nanocrystals (CuInS2, CIS, and AgInS2, AIS) are widely known for their strong defect state emission. On alloying with Zn (CIZS and AIZS), stable and intense emission tunable in visible and NIR windows has already been achieved. In these nanocrystals, the photogenerated hole efficiently moves to the defect-induced state and recombines with the electron in the conduction band. As a result, the defect state emission is predominantly observed without any band edge excitonic emission. Herein, we report the doping of the transition-metal ion Mn in these nanocrystals, which in certain compositions of the host nanocrystals quenches this strong defect state emission and predominantly shows the spin-flip Mn emission. Though several Mn-doped semiconductor nanocrystals are reported in the literature, these nanocrystals are of its first kind that can be excited in the visible window, do not contain the toxic element Cd, and provide efficient emission. Hence, when Mn emission is required, these multinary nanocrystals can be the ideal versatile materials for widespread technological applications.

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“…It was measured with respect to the quininsulfate hydrate (QY 58% in 0.1 N H 2 SO 4 ) solution. 60 3.6. Photocatalysis Studies.…”

Section: Resultsmentioning

confidence: 99%

Low Temperature Fabrication of Photoactive Anatase TiO₂ Coating and Phosphor from Water–Alcohol Dispersible Nanopowder

Mishra

Chattopadhyay

Mitra

et al. 2015

Ind. Eng. Chem. Res.

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Low temperature fabrication of durable photoactive anatase TiO 2 coatings (on glass and plastic substrates) has been accomplished using the synthesized water and water-EtOH dispersible organic-free TiO 2 nanopowder. This nanopowder has been synthesized by refluxing the mixture of Ti(OiPr) 4 , EtOH, and H 2 O in the presence of excess NO 3 − ion as a stabilizer at 80°C for 24 h. The nanopowder has a small crystallite size (∼5 nm) and a high specific surface area of about 268 m 2 g −1 . It is highly dispersible in water (up to 20 wt %), and the water−EtOH mixture (10 wt %) and the resulting dispersions are very stable. The water−EtOH (1:3 w/w) dispersion of the TiO 2 nanopowder (4−5 wt %) has been used to prepare transparent coatings on glass and flexible plastic (polypropylene and polycarbonate) substrates with a surface hardness of ∼2−3 and 1−2 H, respectively, and good adhesion (5B; high quality). The reasons behind good adhesion and hardness of these coatings have been discussed. Such coatings on plastic and glass substrates have been used as reusable photocatalysts for degradation of toxic dye (methylene blue) to show the self-cleaning property under UV (365 nm) and visible light (Xenon source; 1 sun) sources. Further, by using this TiO 2 powder, a fluorescent ZnS:Mn/TiO 2 phosphor can be easily prepared at a much lower temperature.

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Highly Luminescent Mn-Doped ZnS Nanocrystals: Gram-Scale Synthesis

Cited by 201 publications

References 20 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

Mn-Doped Multinary CIZS and AIZS Nanocrystals

Low Temperature Fabrication of Photoactive Anatase TiO₂ Coating and Phosphor from Water–Alcohol Dispersible Nanopowder

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Highly Luminescent Mn-Doped ZnS Nanocrystals: Gram-Scale Synthesis

Cited by 201 publications

References 20 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

Mn-Doped Multinary CIZS and AIZS Nanocrystals

Low Temperature Fabrication of Photoactive Anatase TiO2 Coating and Phosphor from Water–Alcohol Dispersible Nanopowder

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Low Temperature Fabrication of Photoactive Anatase TiO₂ Coating and Phosphor from Water–Alcohol Dispersible Nanopowder