The luminescence and structural characteristics of Eu- doped NaSrB5O9 phosphor |
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Authors: | G.R. Dillip K. Mallikarjuna S.J. Dhoble B. Deva Prasad Raju |
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Affiliation: | 1. Department of Physics, Sri Venkateswara University, Tirupati – 517 502, India;2. Department of Physics, RTM Nagpur University, Nagpur – 440 033, India;3. Department of Future Studies, Sri Venkateswara University, Tirupati – 517 502, India |
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Abstract: | A red-emitting phosphor NaSrB5O9:Eu3+ was synthesized by employing a solid-state reaction (SSR) method. The structures of the phosphors were analyzed by X-ray diffraction (XRD), Fourier-transform infrared (FTIR) and Raman studies. The band at ~282 nm in the excitation spectra indicated the charge transfer band (CTB) of B-O in the host, whereas the CTB of Eu-O was observed at ~275 nm for the NaSrB5O9:Eu3+ (Eu3+=1 at.%) phosphor, which was supported by diffuse reflectance spectroscopy (DRS) measurements. The photoluminescence (PL) measurements exhibited a strong red emission band centered at about 616 nm (5D0→7F2) under an excitation wavelength of 394 nm (7F0→5L6). Upon host excitation at 282 nm, the pristine NaSrB5O9 exhibited a broad UV emission centered at ~362 nm. The energy transfer from host to Eu3+ ions was confirmed from luminescence spectra, excited with a 355 nm Nd:YAG laser. In addition, the asymmetric ratios indicate a higher local symmetry around the Eu3+ ion in the host. The calculated CIE (Commission International de l′Eclairage) coordinates displayed excellent color purity efficiencies (around 99.7%) compared to other luminescent materials. |
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Keywords: | A. Inorganic compounds B. Chemical synthesis C. Infrared spectroscopy D. Microstructure E. Luminescence |
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