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Luminescence spectroscopy of Ln-doped Bi-containing phosphates and molybdates
Affiliation:1. Taras Shevchenko National University of Kyiv, 64 Volodymyrska st., 01601 Kyiv, Ukraine;2. National University of Life and Environmental Sciences of Ukraine, 5 Geroiv Oborony st., 03041 Kyiv, Ukraine;3. Oleksandr Dovzhenko Hlukhiv National Pedagogical University, 24 Kyjevo-Moskovs''ka Street, 41400 Glukhiv, Ukraine;1. Department of Physics, Kohat University of Science and Technology, Kohat 26000, Pakistan;2. Department of Physics, Kyungpook National University, Daegu 702-701, Republic of Korea;1. Saveetha Engineering College, Thandalam, Chennai 602 105, India;2. Radiological Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India;1. State Key Laboratory Base of Novel Function Materials and Preparation Science, School of Material Sciences and Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, PR China;2. Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province, Ningbo, Zhejiang 315211, PR China;1. Department of Physics, Abdul Wali Khan University, Mardan 23200, Pakistan;2. Department of Physics, Kyungpook National University, Daegu 702-701, Korea;3. Department of Radiological Science, Cheongju University, Cheongju 360-764, Korea;4. Department of Physics, Kohat University of Science & Technology, 26000, Pakistan;1. Department of Physics and Electronic Engineering, Baoding University, Baoding 071002, China;2. College of Science, Agricultural University of Hebei, Baoding 071002, China;3. College of Physics Science and Technology, Hebei University, Baoding 071002, China;1. Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences, Wuhan 430074, People''s Republic of China;2. Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, People’s Republic of China
Abstract:The photoluminescence (PL) emission and excitation spectra of undoped and doped with rare-earth (RE = Eu, Tb) ions K3Bi5(PO4)6 and K2Bi(PO4)(MoO4) crystals are studied in 3.7–14 eV region of the excitation photon energies at T = 8 and 300 K. The mechanisms of the host-related and RE-related luminescence in 3.7–7 eV region of the excitation photon energies are revealed in comparative analysis of the PL spectra of studied compounds. It is assumed that the excitation mechanisms of host luminescence of K3Bi5(PO4)6 and K2Bi(PO4) (MoO4) crystals below 4.8 eV are related to Bi3+ ions in oxygen surrounding. An efficient energy transfer from the Bi3+-related luminescence centers to the emitting RE centers exists in crystals with low concentration of the RE dopants (1%). The PL excitation spectra of K3Bi5(PO4)6 crystals with high concentration of Eu dopants are formed by O – Eu CT transitions.
Keywords:Luminescence  Eu  Bismuth  Phosphate  Molybdate
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