Browsing by Author "Achyutha, K."

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    Effect of precursors mixing ratios on the optical and structural properties of Methylammonium tin chloride perovskite
    (Elsevier B.V., 2021) Achyutha, K.; Satyanarayan, M.N.
    A study has been performed by investigating the variation of absorbance and photoluminescence intensity of the perovskite as a function of precursor mixing ratios at room temperature. In this study we used CH3NH3SnCl3 perovskite wherein CH3NH3Cl and SnCl2 solutions are the precursors. These two precursors are mixed with ratios of 3:1, 1:1 and 1:3. XRD, UV–Vis absorption and photoluminescence studies were carried out in both solution and film form. © 2020 Elsevier B.V.
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    Time resolved fluorescence in silver doped cadmium oxide using time correlated single photon counting technique
    (2019) Christina, Rhoda, J.; Giruba, M.; Chellammal, S.; Ravichandran, K.; Achyutha, K.
    The fluorescence brightness of organic fluorophores is unstable and weak for biosensing and bioimaging studies so there is a need for materials with high fluorescence intensity. In this work, inorganic fluorophore, silver doped cadmium oxide was synthesized using co-precipitation technique and its lifetime and fluoresence intensity were analysed. Structural, morphological properties of CdO were characterized by X-ray diffraction and scanning electron microscopic techniques. EDX measurements were done through electron back scattered detection to identify the chemical composition of the samples. The emission wavelength of prepared samples was determined using UV-Vis spectroscopy in diffuse reflectance mode. Fluorescence measurements were done using Time Correlated Single Photon Counting system with a pulsed excitation source. The average fluorescence lifetime was calculated using the pre-exponential factors and resolved decay time components. The results revealed that the addition of silver ions altered the fluorescence lifetime of cadmium oxide. 2019, Institute of Advanced Scientific Research, Inc. All rights reserved.
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    Time resolved fluorescence in silver doped cadmium oxide using time correlated single photon counting technique
    (Institute of Advanced Scientific Research, Inc. dheep.infotel@gmail.com, 2019) Christina Rhoda, J.; Giruba, M.; Chellammal, S.; Ravichandran, K.; Achyutha, K.
    The fluorescence brightness of organic fluorophores is unstable and weak for biosensing and bioimaging studies so there is a need for materials with high fluorescence intensity. In this work, inorganic fluorophore, silver doped cadmium oxide was synthesized using co-precipitation technique and its lifetime and fluoresence intensity were analysed. Structural, morphological properties of CdO were characterized by X-ray diffraction and scanning electron microscopic techniques. EDX measurements were done through electron back scattered detection to identify the chemical composition of the samples. The emission wavelength of prepared samples was determined using UV-Vis spectroscopy in diffuse reflectance mode. Fluorescence measurements were done using Time Correlated Single Photon Counting system with a pulsed excitation source. The average fluorescence lifetime was calculated using the pre-exponential factors and resolved decay time components. The results revealed that the addition of silver ions altered the fluorescence lifetime of cadmium oxide. © 2019, Institute of Advanced Scientific Research, Inc. All rights reserved.