A N YERPUDE
Articles written in Bulletin of Materials Science
Volume 44 All articles Published: 9 June 2021 Article ID 0174
S K RAMTEKE A N YERPUDE N S KOKODE S J DHOBLE
Optical properties of rare earth-activated Ca$_3$(PO$_4$)$_2$:RE (RE = Eu$^{3+}$ and Dy$^{3+}$) phosphors obtained by wet
chemical synthesis method, are reported in this paper. The phase confirmation of synthesized phosphor host is done by
X-ray diffraction study. SEM images of the sample host reveal irregular morphology with collection of particles and
porous nature. The crystal structure is not viewed with naked eyes, although particle size ranges from 2–5 micrometres.
Photoluminescence characterization of Ca$_3$(PO$_4$)$_2$:Eu$^{3+}$ gives characteristic orange–red emission at wavelengths of 594,
613 and 617 nm upon near UV excitation at 397 nm attributed to ${}5$D$_0$ ${\rightarrow}$ ${}7$F$_1$, ${}7$F$_2$ transition of rare earth Eu$^{3+}$ ion.
Whereas Ca$_3$(PO$_4$)$_2$:Dy$^{3+}$ gives blue–yellow emissions at wavelengths 483 and 574 nm due to near UV excitation at
wavelength of 351 nm, which are corresponding to ${}4$F$_{9/2}$ ${\rightarrow}$ ${}6$H$_{15/2}$, ${}6$H$_{13/2}$ transitions of dopant ion Dy$^{3+}$. Colour
coordinates from CIE diagram of 483 and 574 nm are obtained at (
Volume 45, 2022
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Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020
Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020
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