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Synthesis and spectroscopic characterization of the K4BaSi3O9:Eu3+ |
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| Affiliation: | 1. Universitat Politecnica de Catalunya (UPC), Jordi Girona 1, UPC-TSC-D5, 08034 Barcelona, Spain;2. France Telecom Orange, Lannion, France;3. Tellabs, Espoo, Finland;4. Intracom Networks, Athens, Greece;5. Instituto de Telecomunicacoes, Universidade Aveiro, Aveiro, Portugal;6. ISCOM, Rome, Italy;7. Athens Information Technology Center (AIT), Athens, Greece;1. Department of Applied-Physics, Laxminarayan Institute of Technology, Nagpur-33, India;2. Department of Chemistry, Sevadal Mahila Mahavidyalay, Nagpur-09, India;3. Department of Physics, RTM, Nagpur University, Nagpur-33, India;1. Department of Physics and Electronics, Rhodes University, Grahamstown 6140, South Africa;2. School of Physics, University of the Witwatersrand, Johannesburg, South Africa |
| Abstract: | K4BaSi3O9:Eu3+ polycrystals were synthesized by solid state method. X-ray powder diffraction measurements confirmed structure of the samples. The excitation and the emission spectra of orthorhombic K4BaSi3O9 doped with Eu3+ were investigated. The excitation spectrum exhibits a broad band with maximum at 220 nm corresponding to the charge transfer (CT) transition between O2− and Eu3+ ions and smaller 4f–4f transitions. The emission of investigated phosphor was excited at 395 nm and has quantum efficiency (QE) equal 27%. The emission maximum at 616.5 nm was assigned to the 5D0 → 7F2 transition of Eu3+ ions. The luminescence decay profiles as well as the thermal quenching were measured and analyzed. K4BaSi3O9:Eu3+has high temperature quenching of the emission T0.5 = 335 °C. |
| Keywords: | Silicates Luminescence Red phosphor |
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