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Turning of luminescence properties of Ba$_2$V$_2$O$_7$ phosphors by co-doping Eu$^{3+}$/Dy$^{3+}$ ions
N VENKATESH BHARATHI P KAVITHA S RAMASWAMY S S JAYABALAKRISHNAN K SAKTHIPANDI
Volume 45 Published: 2 September 2022 Article ID 0172
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https://www.ias.ac.in/article/fulltext/boms/045/0172 -
Keywords
Hydrothermal method ;luminescence ;charge transfer transition ;WLEDs. -
Abstract
A series of Ba$_{1.97–x}$Eu$_{0.03}$Dy$_x$V$_2$O$_7$ (x = 0.01, 0.02, 0.03, 0.04 and 0.05) phosphor materials were synthesized by hydrothermal method. Phase purity, structural, optical and luminescence characteristics of as-synthesized phosphorshave been studied using powder X-ray diffraction (PXRD), UV–visible spectroscopy and fluorescence spectrometry. The XRD patterns of as-synthesized phosphors were indexed and predicted as triclinic structure. The broad absorption in the UV region was originated from [VO$_4$]$^{3-}$ group charge transfer and the sharp peaks observed in the visible to near-infrared (NIR) region was originated from Eu$^{3+}$/Dy$^{3+}$ ions charge transfer. In photoluminescence (PL) spectra, the broad emission peak observed from 400 to 570 nm was due to the charge transfer band of [VO$_4$]$^{3-}$ group. A sharp peak observed from 570 to 710 nm were due to the charge transition of Eu$^{3+}$/Dy$^{3+}$ ions. The PL spectra recorded for different excitations at 268, 344, 335, 346, 346 and 339 nm, emitted bluish white colour with slight changes in its Commission International de l'Eclairage coordinate values. The white colour emission of Ba$_{1.97–x}$Eu$_{0.03}$Dy$_x$V$_2$O$_7$ phosphors was observed by the irradiation under the UV light 365 nm. Hence, the results have suggested that the as-prepared phosphor materials are the potential candidates in the fabrication of a UV or near-UV chip-excited white light-emitting diode.
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Author Affiliations
N VENKATESH BHARATHI1 2 P KAVITHA3 S RAMASWAMY1 2 S S JAYABALAKRISHNAN3 K SAKTHIPANDI4
- P G and Research Department of Physics, N M S S V N College, Madurai 625 019, India
- Post Graduate Department of Physics, M T N College, Madurai 625 004, India
- Department of Physics, M T N College, Madurai 625 004, India
- Department of Physics, SRM TRP Engineering College, Tiruchirappalli 621 105, India
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Dates
- Published
- 2 September 2022
- Manuscript received
- 31 January 2022
- Accepted
- 1 May 2022
- Final version published online
- 2 September 2022
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Bulletin of Materials Science
Volume 46, 2023
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