International Journal of Science , Engineering and Management (IJSEM)

Monthly Journal for Science , Engineering and Management

Volume3,January 2018,

Topic : Investigation of Increased UV Absorbance, High Quenching Luminescence Efficiency of Quantum Dot Dispersed Nematic Mesogen and Its Relevance in Photonic Applications

Authors:Ayushi Rastogi || Atul Srivastava, Jakub Herman, Rajiv Manohar

Abstract:The dispersion of Cd1-xZnxS/ZnS core/shell QD (x=0.85) in nematic liquid crystal into different concentrations has been examined. The spectroscopic parameters such as UV visible absorbance, Photoluminescence (PL) and Fourier Transform Infrared (FTIR) spectra have been observed for pristine and QD dispersed nematic system. The UV visible absorbance spectra brings to light one absorbance peak corresponding to π-π* transition. Increased UV absorbance with decreased band gap for dispersed system reveals the strong photo absorption (i.e. quenched luminescence). In the present study, the blue shift in Photoluminescence has been observed. The remarkable results have been found for 0.1% and 0.25% wt/wt QD dispersed nematic system with an average of 51.7% and 61.7% quenching in PL intensity. The existing theory provides support for our observation of quenching in PL intensity. Full width half maxima (FWHM) obtained from the Gaussian fit have been the support for the quenching in PL. The FTIR spectra explain the symmetric and asymmetric C-H stretching vibrations which confirm the quenched PL intensity. The UV visible absorbance, PL and FTIR studies have been performed in order to disclose the nature of QD dispersed nematic system. The upshot of the present study finds its relevance in the field of various display and photonic applications as well as in the photovoltaic devices. .

Keywords: Nematic liquid crystal; Quantum dot; UV visible spectroscopy; Photoluminescence; FTIR.

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DOI: 01.1617/vol5/iss1/pid80937

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Editor Image

Dr.Muhammad Ishtiaq,
Mirpur University of
Science & Technology,
Mirpur, Azad Kasmir.

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ISSN(Online): 2456-1304

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Thomson Reuters ID : q-6288-2016.
ORCiD Research ID : 0000-0001-9540-6799

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Journal Code : IJSEM
Electronic ISSN : 2456-1304
Impact Factor : 2.7
Frequency : Monthly
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