Author : Sanjeeb Limbu 1
Date of Publication :30th September 2020
Abstract: This work reports structural and luminescence properties of tunable Y 2 O 3 :Eu 3+ red-emitting nanophosphors sensitized with Li + and Bi 3+ by wet chemical method. The structural property followed by X-ray diffraction analysis shows the nanophosphors have a body-centered cubic (I) phase with space group Ia-3 and point group symmetry m-3. No additional impurity peaks were observed within the range of the XRD pattern due to the Li + and Bi 3+ ion. The unit cell structure of cubic Yttrium oxide (Y 2 O 3 ) was modeled by using Rietveld refinement XRD data. The photoluminescence study shows the most intense red emission band at 612 nm due to the 5 D 0 → 7 F 2 transition of Eu 3+ ion in the C 3i and C 2 symmetry site of Y 2 O 3 respectively. The emission band of Li + codoped Y 2 O 3 :Eu 3+ nanophosphor shows 2.97 times enhancement than the Y 2 O 3 :Eu 3+ one because of the flux effect created by Li + ion. The Bi 3+ codoped Y 2 O 3 :Eu 3+ nanophosphor shows the most intense band as compared to the other bands and is due to the energy transfer from Bi 3+ to Eu 3+ ion. It shows 6.56 times higher enhancement than the emission band corresponds to Y 2 O 3 :Eu 3+ nanophosphor. The average lifetime was found to vary based on the different sensitizers used. The calculated Commission Internationale de l’Eclairage (CIE) 1931 chromaticity coordinates and correlated color temperature (CCT) values were tuned in the red region of the color space. All the results indicate that the prepared nanophosphor can be used as a potential red component to construct the white light for white light-emitting diodes fabrication.
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