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C M NANDANWAR
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Volume 46 All articles Published: 14 March 2023 Article ID 0051
C M NANDANWAR N S KOKODE A N YERPUDE S J DHOBLE
The BiPO$_4$:Ln (Ln = Dy$^{3+}$, Tb$^{3+}$ and Sm$^{3+}$) phosphor were prepared using wet chemical synthesis and studied its photoluminescence properties. Under 352 nm excitation, the BiPO$_4$:Dy$^{3+}$ phosphor shows the blue (481 nm)and yellow (575 nm) emissions due to the ${}^4$F$_{9/2}$ ${\rightarrow}$ ${}^6$H$_{15/2}$ and ${}^4$F$_{9/2}$ ${\rightarrow}$ ${}^6$H$_{13/2}$ transitions of the Dy$^{3+}$ ion, respectively. When BiPO$_4$:Tb$^{3+}$ phosphor was excited at 378 nm, it emits efficient narrow green emission at 545 nm due to ${}^5$D$_4$ ${\rightarrow}$ ${}^7$F$_5$ transition. The BiPO$_4$:Sm$^{3+}$ phosphor shows yellow, orange and red emissions centred at 598 nm, which is attributed to the ${}^4$G$_{5/2}$ ${\rightarrow}$ ${}^6$H$_{7/2}$ transition of the Sm$^{3+}$ ion. The CIE coordinates indicate that the prepared phosphors have high colour purity. The photoluminescence results suggests that BiPO$_4$:Ln (Ln = Dy$^{3+}$, Tb$^{3+}$ and Sm$^{3+}$) phosphor may be used as a possible material for near-UV-based solid-state lighting.
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Bulletin of Materials Science
Volume 46, 2023
All articles
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Dr Shanti Swarup Bhatnagar for Science and Technology
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