A novel self activated K2XV2O7 (X = Mg and Zn) pyrovanadate green phosphor: Systematic characterization and time resolved photoluminescence |
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| Institution: | 1. Applied Chemistry Department, Sardar Vallabhbhai National Institute of Technology, Surat, 495007, India;2. Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai, 40085, India;3. Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, 40085, India;4. Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 40085, India;1. National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, and Grirem Advanced Materials Co., Ltd., Beijing 100088, PR China;2. State Key Laboratory of Rare Earth Materials and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China;3. School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, PR China;4. School of Physics, Peking University, Beijing 100871, PR China;1. Department of Applied Physics, Bhilai Institute of Technology (Seth Balkrishan Memorial), Near Bhilai House, Durg (C.G.) 491001, India;2. School of Studies in Physics and Astrophysics, Pt. Ravishankar Shukla University, Raipur (C.G.) 492010, India;3. Department of Chemistry, Shri Shanakaracharya Vidhyalya, Hudco (C.G.) 490006, India |
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| Abstract: | Novel self activated green phosphors; K2ZnV2O7 (KZV) and K2MgV2O7 (KMV) have been prepared and characterized in details. Both KZV and KMV were prepared by solid state reaction and systematically characterized by a number of techniques like X-ray diffraction (XRD), Fourier transformed Infrared (FTIR), Raman spectroscopy, Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), diffuse reflectance spectroscopy (DRS) and time resolved photoluminescence spectroscopy (TRPLS). XRD studies confirm tetragonal melilite type layered phase for both of them. The presence of pyrovanadate group in both is supported by FTIR and Raman spectroscopic investigations. Raman bands of KMV are blue shifted w.r.t to KZV which may be due to shorter bond lengths of MgO compared to ZnO and lower atomic weight of magnesium compared to zinc. DRS measurements indicated the optical band gap of KMV and KZV are 3.14 and 3.12 eV, respectively. Optical measurements on these samples show the emission of green color on ultra violet light irradiation. The origin of such emission is attributed to electronic transition (charge transfer) from filled 2p orbital of oxygen ion (O2−) to vacant 3d orbital of vanadium ion (V5+). In KZV there are dual emission band (PL1 and PL2) which are respectively attributed to 3T2 → 1A1 and 3T1 → 1A1transition, and the emission zone varies slightly compared to KMV. KZV emits bluish green (cool green) where KMV emits in yellowish green (warm green) region. This is indeed an important step towards realization of cost effective rare earth free luminescence material. It is also oberved that PL intensity of KZV is very high compared to KMV which is supported by the lifetime measurements. |
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| Keywords: | Materials Phosphor Luminescence Pyrovanadate Spectroscopy |
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