Optoelectronic and Nanomaterials Research Laboratory

Aluva, India

Optoelectronic and Nanomaterials Research Laboratory

Aluva, India
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Radhakrishnan P.,P.A. College | Radhakrishnan P.,Optoelectronic and Nanomaterials Research Laboratory | Krishnakumar G.,P.A. College | Anila E.I.,Optoelectronic and Nanomaterials Research Laboratory | And 2 more authors.
Optics InfoBase Conference Papers | Year: 2016

Emission-wavelength-tuning of dyes Rhodamine-B(RhB) and Curcumin incorporated electrospun polymethylmethacrylate(PMMA) microfibers was done. Such multi-component polymer matrix can be used for emission-wavelength-tuning in tunable dye lasers. These fibers were characterized by spectroscopic and electron microscopic techniques. © OSA 2016.


Safeera T.A.,Optoelectronic and Nanomaterials Research Laboratory | Anila E.I.,Optoelectronic and Nanomaterials Research Laboratory
International Journal of Biological Macromolecules | Year: 2017

The structural and optical properties of nanomaterials exhibit severe changes when capped with organic polymers. In this work we focus on the effect of chitosan capping on ZnO:Na nanoparticles synthesized by wet chemical method. The main characteristics analyzed are x-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR) and photoluminescence (PL). Hexagonal crystal formation of nanoparticles was confirmed from the XRD and the lattice strain was estimated from the Williamson Hall (WH) plot. Various bonds present in the synthesized sample were analyzed using FTIR. Capping results in the reduction in grain size thereby enhancement in the PL intensity. The yellow emission is in well agreement with the Commission International d'Eclairage (CIE) diagram. © 2017 Elsevier B.V.


Sabira K.,Division for Research in Advanced Materials | Saheeda P.,Division for Research in Advanced Materials | Anila E.I.,Optoelectronic and Nanomaterials Research Laboratory | Jayalekshmi S.,Division for Research in Advanced Materials
Journal of Luminescence | Year: 2017

Zinc Sulphide doped with manganese (ZnS:Mn) and copper (ZnS:Cu) is well studied, due to its promising luminescence characteristics. Though there are numerous publications related to manganese and copper doped zinc sulphide, there are no reports on the growth of free standing and stable nanocomposite films of ZnS:Mn or ZnS:Cu with a polymer. The search for freestanding, flexible, mechanically and thermally stable films endowed with the excellent luminescent properties of doped zinc sulphide is the motivation behind the present studies. Poly(vinylidene flouride) (PVDF) is a fluoro polymer with impressive piezoelectric, ferroelectric and pyroelectric properties and at the same time highly flexible and processable. When PVDF/ doped ZnS nanocomposite film is placed in UV light, bright yellow orange luminescence is observed for the manganese doped film and blue luminescence, for the copper doped film. These nanocomposite films offer high prospects of wide range of applications in field emission displays, plasma displays and electroluminescent devices. By combining the yellow orange emission of ZnS:Mn and the blue emission of ZnS:Cu in the required optimised ratio, it is possible to develop white light emitting, freestanding, stable and flexible nanocomposite films of PVDF/doped ZnS. © 2017 Elsevier B.V.


Anilkumar M.,U C College | Bindu K.R.,Optoelectronic and Nanomaterials Research Laboratory | Bindu K.R.,SSV College | Sneha Saj A.,U C College | Anila E.I.,Optoelectronic and Nanomaterials Research Laboratory
Chinese Physics B | Year: 2016

Toxicity of nanoparticles remains to be a major issue in their application to the biomedical field. Aloe vera (AV) is one of the most widely exploited medicinal plants that have a multitude of amazing properties in the field of medicine. Methanol extract of Aloe vera can be used as a novel stabilising agent for quantum dots to reduce toxicity. We report the synthesis, structural characterization, antibacterial activity and cytotoxicity studies of ZnS:Mn quantum dots synthesized by the colloidal precipitation method, using methanol extract of Aloe vera (AVME) as the capping agent. The ZnS:Mn quantum dots capped with AVME exhibit superior performances in biocompatibility and antibacterial activity compared with ZnS:Mn quantum dots without encapsulation. © 2016 Chinese Physical Society and IOP Publishing Ltd.


Bindu K.R.,Sree Sankara Vidyapeetom College | Sreenivasan P.V.,Union Christian College | Martinez A.I.,CINVESTAV | Anila E.I.,Optoelectronic and Nanomaterials Research Laboratory
Journal of Sol-Gel Science and Technology | Year: 2013

The structural, morphological, optical and electrical properties of α-axis oriented nanostructured ZnS thin film prepared by dip coating have been studied in this article. The X-ray diffraction studies of the film shows that the ZnS was crystallized with cubic structure of particle size 27 nm with a strong orientation along (200) plane which is advantageous for optoelectronic devices. The scanning electron microscopy and TEM micrograph reveals that the film consists of nano crystalline columnar particles. From the investigation of the absorption spectra of this ZnS film, the band-gap is found to be higher (4 eV) than bulk (3.7 eV) indicating a blue shift. It is found that the film is having a transparency of >90 % in the visible-near IR region from 400 to 800 nm. From the photoconductivity measurements, it is evident that the film is photosensitive in nature. From the electrical resistivity measurements the conductivity of the film was found to be 3.4 × 10-2 Ω-1 cm-1. Hot probe method indicates that the synthesized ZnS film is n-type. © 2013 Springer Science+Business Media New York.


Athma P.V.,Optoelectronic and Nanomaterials Research Laboratory | Athma P.V.,SNM College | Johns N.,Indian Institute of Technology Bombay | Anila E.I.,Optoelectronic and Nanomaterials Research Laboratory | Safeera T.A.,Optoelectronic and Nanomaterials Research Laboratory
Optical Materials | Year: 2014

This paper presents the synthesis of potassium (K) doped zinc oxide nano sheets at room temperature by wet chemical method. The structure and morphology of the crystals prepared for different molar concentrations of K were analysed by X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Lattice strain and grain size were calculated from the Williamson-Hall (WH) Plot and Debye-Scherrer's formula for different concentrations of potassium. Absorption studies reveal that absorption is minimum in the visible region and band gap energy is found to decrease with increase in K concentration. The photoluminescence (PL) spectra were used to study the luminescence behavior and the nature of defects in the samples and the overall emission is white for all the samples except the one prepared with 1.2 M potassium doping. © 2014 Elsevier B.V. All rights reserved.


Athma P.V.,Optoelectronic and Nanomaterials Research Laboratory | Athma P.V.,SNM College | Martinez A.I.,CINVESTAV | Johns N.,Indian Institute of Technology Bombay | And 3 more authors.
Superlattices and Microstructures | Year: 2015

Abstract Zinc oxide (ZnO) nanostructures find applications in optoelectronic devices, photo voltaic displays and sensors. In this work zinc oxide nanostructures in different forms like nanorods, tripods and tetrapods have been synthesized by thermal evaporation of zinc metal and subsequent deposition on a glass substrate by vapor transport in the presence of oxygen. It is a comparatively simpler and environment friendly technique for the preparation of thin films. The structure, morphology and optical properties of the synthesized nanostructured thin film were characterized in detail by using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and photoluminescence (PL). The film exhibited bluish white emission with Commission International d'Eclairage (CIE) coordinates x = 0.22, y = 0.31. © 2015 Published by Elsevier Ltd.

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