Crystallographic,morphological and photoluminescent investigations of Tb3+-doped YAlO3 perovskites for lighting applications |
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| Authors: | Isha Gupta Devender Singh Sitender Singh Pawan Kumar Shri Bhagwan Vinod Kumar Harish Kumar Sunil Kumar Chhikara |
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| Institution: | 1. Department of Chemistry, Maharshi Dayanand University, Rohtak, India;2. Department of Physics, Netaji Subhas University of Technology, Delhi, India;3. Department of Chemistry, School of Chemical Sciences, Central University of Haryana, Mahendergarh, India;4. University Institute of Engineering and Technology, Maharshi Dayanand University, Rohtak, India |
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| Abstract: | Terbium(III)-doped yttrium aluminate perovskite (YAP:xTb3+) (x = 0.01–0.08 mol) was synthesized using a simple gel-combustion method. Structural elucidations were performed using X-ray diffraction (XRD) and Rietveld analysis. Fourier-transform infrared spectral studies validated the efficient synthesis of designed doped samples. Transmission electron microscopic images showed the agglomerated irregular dimensions of the synthesized nanocrystalline materials. When excited at 251 nm, a strong emissive line attributed to 5D4 → 7F5 electronic transition was observed at 545 nm (green emission). The maximum luminescence was found at the optimized concentration (0.05 mol) of Tb3+ ions; this emission was quenched by dipolar–dipolar (d–d) interactions. Chromaticity (x and y) and correlated colour temperature parameters were obtained by analysing the emission profiles. Finally, the colour coordinates of nanophosphors were closer to the National Television Standards Committee green coordinates, which replicates their potency in the design and architecture of R-G-B-based white LEDs. |
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| Keywords: | chromaticity parameters Rietveld refinement X-ray diffraction yttrium aluminate perovskite |
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