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Chaudhary Charan Singh Haryana Agricultural University, Hisar

Chaudhary Charan Singh Haryana Agricultural University popularly known as HAU, is one of Asia's biggest agricultural universities, located at Hisar in the Indian state of Haryana. It is named after India's seventh Prime Minister, Chaudhary Charan Singh. It is a leader in agricultural research in India and contributed significantly to Green Revolution and White Revolution in India in the 1960s and 70s. It has a very large campus and has several research centres throughout the state. It won the Indian Council of Agricultural Research's Award for the Best Institute in 1997. HAU was initially a campus of Punjab Agricultural University, Ludhiana. After the formation of Haryana in 1966, it became an autonomous institution on February 2, 1970 through a Presidential Ordinance, later ratified as Haryana and Punjab Agricultural Universities Act, 1970, passed by the Lok Sabha on March 29, 1970. A. L. Fletcher, the first Vice-Chancellor of the university, was instrumental in its initial growth.

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Subject: Physics × Author: Janvi × End date: 2023 × Start date: 2020 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    To study morphological and optical properties of doped zinc sulfide
    (CCSHAU, Hisar, 2023-05) Janvi; Vinay Kumar
    Zinc Sulphide (ZnS) is a semiconductor receiving discernible attention as a nanomaterial scale because of excellent ion accessibility, charge storage ability, enhanced luminescent efficiency and lifetime shorting in comparison to that of bulk. However, doping of manganese (Mn) ion enhances its optoelectronic properties due to large exciton energy and wide bandgap at room temperature. ZnS and Mn-doped ZnS have been synthesized using the hydrothermal approach with 5, 10, and 20 % of Mn dopants. Prepared samples were characterized using X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), Field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR), UV-Vis and Photoluminescence (PL) spectroscopy. The XRD pattern confirmed the cubic sphalerite crystal structure of prepared nanoparticles (NPs) whereas FE-SEM micrographs showed sphere-shaped NPs. The EDX spectrum measurements showed that spectra of Mn-doped ZnS exhibit peak related to elemental Mn. The stretching mode of undoped ZnS was observed at 636 cm -1 and the Zn-S-Zn network was perturbed by the presence of Mn. The energy bandgap was found to be decreased with increasing doping percentage from 5 to 20%, which is agreed to XRD. The PL spectra of Mn-doped ZnS showed at room temperature exhibit both the blue defect-related emission and orange Mn +2 emission due to the 4 T1 – 6A1 transition.