• PAILENDRA KUMAR SAHU

Articles written in Bulletin of Materials Science

• Photoluminescence and energy transfer mechanism in Y$_6$Ba$_4$(SiO$_4$)$_6$F$_2$ apatite phosphors doped with cerium and terbium

Y$_6$Ba$_4$(SiO$_4$)$_6$F$_2$ (YBSF) phosphors having apatite structure was doped with cerium and terbium and prepared by solid-state reaction method. Structural and photoluminescence properties of the prepared apatite phosphors were studied and discussed in detail. X-ray diffraction graph affirms that the prepared phosphor has hexagonal symmetry with space group P6$_3$/m, representing the apatite structure. Scanning electron microscopy reveals the morphology of the prepared phosphor and clearly shows an elongated rod-like structure. Energy dispersive X-ray spectroscopy pattern confirms the presence of all initial constituents in YBSF:0.6Ce$^{3+}$, xTb$^{3+}$. Fourier transform infrared spectroscopy study was conducted to identify various functional groups present in the prepared phosphors. Photoluminescence excitation and photoluminescence emission spectra of YBSF:0.8Tb$^{3+}$ and YBSF:0.6Ce$^{3+}$,xTb$^{3+}$ (x = 0, 0.2, 0.4, 0.6, 0.8 and 1 mol%) were obtained and studied. Photoluminescence spectra successfully established the energy transfer mechanism working between Ce$^{3+}$ and Tb$^{3+}$ ions and the energy transfer efficiency was found to be 66%. Commission Internationale de I’Eclairage(CIE) chromaticity coordinate clearly shows the colour tenability property of YBSF:0.6Ce$^{3+}$,xTb$^{3+}$. The emitted light in YBSF:0.6Ce$^{3+}$,xTb$^{3+}$ depends on the concentration of Tb$^{3+}$.

• # Bulletin of Materials Science

Volume 46, 2023
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Posted on October 12, 2020

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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