| Autor: |
Venkatesh Bharathi, N., Kavitha, P., Ramaswamy, S., Jayabalakrishnan, S. S., Sakthipandi, K. |
| Zdroj: |
Indian Journal of Physics; May2023, Vol. 97 Issue 5, p1437-1444, 8p |
| Abstrakt: |
This study is aimed to tune the Ba2V2O7 phosphors as the potential candidates in the fabrication of ultra-violet (UV) or near-UV chip-excited white light-emitting diodes (WLEDs) by incorporating Dy3+ and Eu3+ ions in the host lattice. A series of Dy3+ and Eu3+ ions-doped Ba2V2O7 phosphor materials was synthesized using the hydrothermal method. Phase purity, structural, optical, and luminescence characteristics of as-synthesized Dy3+ and Eu3+ ions-doped Ba2V2O7 phosphors were studied using powder X-ray diffraction (XRD), UV–visible spectroscopy, and fluorescence spectrometry. The XRD patterns of Dy3+ and Eu3+ ions-doped Ba2V2O7 phosphors were indexed with triclinic structure as parent Ba2V2O7 phosphor compounds. The broad absorption in the UV region was originated from the parent Ba2V2O7 phosphors ([VO4]3−) group charge transfer (CT). The overall emission peak centered at 495 nm was due to the charge transfer band (CTB) of the [VO4]3− group. In addition, the sharp peaks observed in the visible to near-infrared (NIR) region also originated due to CT from the dopant Dy3+/Eu3+ ions. The charge transition of Dy3+ and Eu3+ ions with the parent leads to sharp peaks, observed from 570 to 710 nm. The photoluminescence (PL) spectra recorded at 348 nm emission color tuned from bluish-white to greenish-yellow. The irradiation observed the white color emission of Dy3+ and Eu3+ ions-doped Ba2V2O7 phosphors under the UV light 365 nm. Hence, the results have suggested that the as-prepared Dy3+ and Eu3+ ions-doped Ba2V2O7 phosphors are the potential candidates for fabricating a UV or near-UV chip-excited WLEDs. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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