Photo-luminescence studies of strontium barium niobate crystals doped with Cr3+ ions |
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| Institution: | 1. Department of Physics, University of Strathclyde, John Anderson Building, 107 Rottenrrow, Glasgow G4 ONG, Scotland, UK;2. Departamento de Física de Materiales, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain;3. General Physics Institute of the RAS, Laser Materials and Technologies Research Centre, 38 Vavilov Street, 119991 Moscow, Russia;1. Murata Manufacturing Co., Ltd., Nagaokakyo-shi, Kyoto 617-8555, Japan;2. Institute for Laser Science, University of Electro-Communications, Tokyo 182-8585, Japan;3. Institute of Crystallography, Russian Academy of Sciences, Moscow 119333, Russia;1. Department of Chemistry and NanoScience Technology Center, University of Central Florida, 12424 Research Parkway Suite 400, Orlando, FL 32826, United States;2. Burnett School of Biomedical Science, College of Medicine University of Central Florida, 12424 Research Parkway Suite 400, Orlando, FL 32826, United States;1. Department of Prosthetic Dental Sciences, College of Dentistry, Taibah University, Medina, Saudi Arabia;2. Department of Materials Science and Engineering, School of Engineering, The University of Alabama at Birmingham, United States;1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China;2. Xi’an Hongxing Electronic Paste Co. Ltd., Xi’an 710065, China |
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| Abstract: | This paper reports the photo-luminescence spectroscopic results of Strontium–Barium–Niobate, Srx,Ba1−xNb2O5 (SBN, x = 0.61 for near congruent composition) crystals doped with Cr2O, at cryogenic temperature (20 K). The experimental results reveal the need of re-assignment of the Cr3+ ions defect centres in this material. For first time, a broad emission band in the near infrared region centred at ca. 950 nm is reported. This emission band has micro-seconds decaytime constant and a FWHM band-width > 1700 cm−1 and has been ascribed to the vibronically assisted 4T2 → 4A2 transition. A much narrower emission band centred at ca. 764 nm with milli-seconds decaytime constant and a FWHM band-width of ca. 170 cm−1 is correlated to the 2E → 4A2 radiative transition (R-line). |
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