Structural and photoluminescence properties of Mg substituted ZnO nanoparticles

Mallika, A. N.; Reddy, A. Ramachandra; Babu, K. Sowri; Sujatha, Ch.; Reddy, K. Venugopal

doi:10.1016/j.optmat.2013.12.015

Cited by 79 publications

(32 citation statements)

References 26 publications

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“…Figure 3 depicts the FTIR spectra of the annealed samples CA400, CA500, CA600, CA700, PVA400, PVA500, PVA600, and PVA700. Two strong frequency bands are observed in all the samples at 556-445 cm 1 corresponding to characteristics of ZnO wurtzite structure [15]. The peaks observed at 1600 and 1384 cm 1 are assigned to the asymmetrical and symmetrical stretching of zinc carboxylate, respectively [16].…”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 84%

Annealing effects on the structural and optical properties of ZnO nanoparticles with PVA and CA as chelating agents

Mallika

Reddy

2015

J Adv Ceram

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Abstract:The effects of annealing temperatures and chelating agents on the structural and optical properties of ZnO nanoparticles were investigated. The average particle size of ZnO nanoparticles increased with increase of annealing temperatures. The decrease of the full width at half maximum (FWHM) with increasing annealing temperatures inferred increase of particle/grain growth. The grain sizes were also observed to be increased with increase of annealing temperatures. From the absorption spectra of the samples, the absorption was red-shifted and the energy band gap was blue-shifted with increase of annealing temperatures. A sharp UV emission peak was observed and the intensity of this peak increased with annealing temperatures corresponding to the high crystallinity in the samples. At high annealing temperature of 700 ℃, ZnO exhibited a less intense deep level emission. This negligible deep level emission was attributed to the oxygen vacancies created at higher annealing temperatures.

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Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 84%

Annealing effects on the structural and optical properties of ZnO nanoparticles with PVA and CA as chelating agents

Mallika

Reddy

2015

J Adv Ceram

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“…It is observed that the strain values show an increasing trend with increased concentration of Mn confirming the deterioration of the crystalline quality of the CdO films with Mn doping. Mallika et al [18] reported that an increase of strain causes reduction of crystallite size and increase of peak broadening. From Fig.…”

Section: Structural Studiesmentioning

confidence: 99%

Effect of doping concentration on the structural, morphological, optical and electrical properties of Mn-doped CdO thin films

Manjula¹,

Pugalenthi²,

Nagarethinam³

et al. 2015

Materials Science-Poland

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Thin films of manganese-doped cadmium oxide (CdO:Mn) with different Mn-doping levels (0, 1, 2, 3 and 4 at.%) were deposited on glass substrates by employing an inexpensive, simplified spray technique using a perfume atomizer at 375°C. The influence of Mn incorporation on the structural, morphological, optical and electrical properties of CdO films has been studied. All the films exhibit cubic crystal structure with a (1 1 1) preferential orientation. Mn-doping causes a slight shift of the (1 1 1) diffraction peak towards higher angle. The crystallite size of the films is found to decrease from 34.63 nm to 17.68 nm with an increase in Mn doping concentration. The CdO:Mn film coated with 1 at.% Mn exhibit a high transparency of nearly 90 % which decreases for higher doping concentration. The optical band gap decreases with an increase in Mn doping concentration. All the films have electrical resistivity of the order of 10 −4 Ω·cm.

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“…The broad blue band emissions are possibly due to surface defects such as oxygen vacancies (V O ) and Zinc interstitials (Zn i ). The green luminescence is attributed to radiative recombination of photo generated holes in valence band with electrons in singly occupied oxygen vacancies [18][19][20][21]. It is observed that intensity of PL emission increases with Mg 2+ concentration up to 1.5 mol% and then decreases.…”

Section: Photoluminescencementioning

confidence: 98%