Synthesis and photoluminescence enhancement of Mn2+-doped ZnS nanocrystals

Lu, Song; Lee, Burtrand I.; Wang, Zhong Lin; Tong, W.; Wagner, B. K.; Park, Won; Summers, Christopher J.

doi:10.1016/s0022-2313(00)00238-6

Cited by 95 publications

(39 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have also recorded PL emission spectra from the synthesized samples at room temperature. Different groups have reported previously the PL emission characteristics of ZnS and ZnS:Mn nanostructures with different crystalline structures and observed blue, green and yellow-orange light emissions and prescribed different origin for such emissions (Bhargava et al 1994, Son et al 2007Tiwari et al 2010;Hu and Zhang 2006;Sarkar et al 2008;Lu et al 2001;Sooklal et al 1996). The simultaneous presence of the yellow-orange PL peak along with the PL emission in the blue region in Mn 2?…”

Section: Introductionmentioning

confidence: 89%

“…Based on the report of (Bhargava et al 1994;Bhargava 1996), research studies are carried out on doped II-VI semiconductor nanomaterials to enhance their light emission properties and thereby making them good candidate for optoelectronic applications Peng et al 2006;Hu and Zhang 2006;Kripal et al 2010;Dong et al 2010;Lu et al 2010). Recently Mn ?2 -doped ZnS nanocrystals (ZnS:Mn) have attracted much more attention because it is found that these materials can be used as efficient phosphor and in bio-imaging applications due to their nonlinear optical multiphoton absorption characteristics in the infrared and visible wavelength regions (Hu and Zhang 2006;Chattopadhyay et al 2009a, b;Nazerdeylami et al 2011 (Lu et al 2001). Bhargava et al (1994);Bhargava (1996) reported that, if the particle size is decreased, a strong hybridization of the sp states of the ZnS host and the d states of the Mn 2?…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of manganese doping on the photoluminescence characteristics of chemically synthesized zinc sulfide nanoparticles

Kole

Kumbhakar

2011

Appl Nanosci

View full text Add to dashboard Cite

The studies on luminescent II-VI semiconducting nanomaterials have attracted widespread attention recently, due to their potential applications in optoelectronic and biophotonic devices. Amongst other II-VI semiconductor nanoparticles (NPs), Mn 2? -doped ZnS NPs having large exciton binding energy and wide direct band gap at room temperature have drawn considerable attention for exploring its interesting optical properties. However, in this report, water-soluble Mn 2? -doped ZnS (ZnS:Mn) NPs with Mn 2? concentration varying between 1.5 and 5% (wt%) have been synthesized by chemical co-precipitation method at room temperature. X-ray diffraction (XRD) studies and the analysis of the selected area electron diffraction (SAED) pattern, obtained from transmission electron microscopy (TEM), confirmed the formation of zinc blende structure in all the synthesized samples. The particle sizes of the samples, as obtained from the optical absorption studies, varies between 2.2 and 2.7 nm with the increase of Mn 2? concentration between 1.5 and 5%. The room temperature photoluminescence (PL) emission measurements revealed the presence of yellow-orange emission band in all the Mn 2? -doped samples which is attributed to Mn incorporation in ZnS. The Gaussian fittings of the measured PL spectra of all the samples show the presence of four PL peaks. Amongst the four PL peaks three peaks appeared at 445, 476, and 520 nm in all the samples but the fourth yellow-orange emission peak suffered a red shift from 593 to 600 nm with increasing Mn 2? concentration from 1.5 to 5%. In this report no quenching of yelloworange emission peak is observed up to 5% Mn 2? doping concentration in ZnS. The synthesized water-soluble ZnS:Mn NPs can be further functionalized for using them as biolabels.

show abstract

Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Effect of manganese doping on the photoluminescence characteristics of chemically synthesized zinc sulfide nanoparticles

Kole

Kumbhakar

2011

Appl Nanosci

View full text Add to dashboard Cite

show abstract

“…These claims spurred many other publications, from different groups, reporting on the luminescent properties of Mn 2+ doped nanocrystals [9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Some groups reported the Mn 2+ luminescence decay times to be in the ns range [10,12], whereas others observed it in the ms range [11,17].…”

Section: Introductionmentioning

confidence: 98%

Time-resolved luminescence of ZnS:Mn2+ nanocrystals

Donegá

Bol

Meijerink

2002

Journal of Luminescence

View full text Add to dashboard Cite

Recently, Yu and co-workers reported the observation of hot luminescence for Mn 2+ in 3.6 nm ZnS nanocrystals, implying that the phonon relaxation rates in nanocrystals were B10 6 times lower than that in bulk materials. In order to verify this unexpected observation, we investigated the time-resolved spectroscopy of 4.5 nm ZnS:Mn 2+ nanocrystals. Samples with two different Mn 2+ concentrations were studied. In contradiction with the results reported by Yu and co-workers, no evidence of Mn 2+ hot luminescence was found, regardless of the Mn 2+ concentration, temperature (4.2-300 K), time delay (0.1-1000 ms), gate width (2-3000 ms), or excitation density (40-700 mJ/cm 2 ).

show abstract

“…The lattice parameter was estimated and the values of "a" was 5.40 [28]. The XRD peaks are broadened due to nanocrystalline nature of particles because nanocrystals have lesser lattice planes compared to bulk, which contributes to the broadening of the peaks in the diffraction pattern [29,30]. From the width of the XRD peak broadening, the mean crystalline size was calculated using Scherrer's equation: D = 0.9λ/β cos θ, where λ is the X-ray wavelength (Cu Kα radiation 1.541Å), θ is the diffraction angle, and β is the half-width of the diffraction peak.…”

Section: Morphological and Opticalmentioning

confidence: 99%

Luminescence and Morphological Kinetics of Functionalized ZnS Colloidal Nanocrystals

2012

View full text Add to dashboard Cite

This paper reports functionalized zinc sulphide (ZnS) semiconductor nanocrystals (quantum dots, approx., 2.5 nm) which are an important building block in self-assembled nanostructures. ZnS is functionalized by organic stabilizer Thio glycolic acid (TGA). The samples have been synthesized by colloidal technique at relatively low temperature (below 100• C) at an atmospheric pressure of 10 −3 torr. Manganese (Mn) doping ions have been incorporated (doped) in ZnS host lattice and observed its effect on growth morphology and optical properties of ZnS colloidal nanocrystals. By XRD, SEM, TEM, and PL, the obtained cubic phase nanosized TGA-capped ZnS materials were characterized. The morphology of ZnS obtained at different temperatures are analyzed by SEM. The crystallite size of the ZnS nanoparticles was estimated from the X-ray diffraction pattern by using Scherrer's formula (approximately 2.5 nm) which is confirmed by TEM. The estimated bandgap value of ZnS NC's by (αhύ) 2 versus hύ plot was 4.89 eV. Gaussian fitting curve in photoluminescence (PL) spectra indicated room temperature emission wavelength range from 300 to 500 nm in undoped and Mn-doped ZnS, with different emission peak intensities, and suggested the wide band emission colours in visible and near UV region which has wider applications in optical devices.

show abstract

Synthesis and photoluminescence enhancement of Mn2+-doped ZnS nanocrystals

Cited by 95 publications

References 24 publications

Effect of manganese doping on the photoluminescence characteristics of chemically synthesized zinc sulfide nanoparticles

Effect of manganese doping on the photoluminescence characteristics of chemically synthesized zinc sulfide nanoparticles

Time-resolved luminescence of ZnS:Mn2+ nanocrystals

Luminescence and Morphological Kinetics of Functionalized ZnS Colloidal Nanocrystals

Contact Info

Product

Resources

About