Microwave-assisted synthesis of ZnGa2-x-yEuxTbyO4luminescent nanoparticles showing balanced white-light emission

Hebbar N, D and Choudhari, KS and Pathak, N and Shivashankar, SA and Kulkarni, SD (2022) Microwave-assisted synthesis of ZnGa2-x-yEuxTbyO4luminescent nanoparticles showing balanced white-light emission. In: New Journal of Chemistry, 46 (13). pp. 6103-6113.

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Abstract

Phosphor-converted white-light-emitting diodes (pc-WLEDs) are technologically advanced next-generation lighting sources, which will potentially substitute traditional lighting. Herein, we report microwave-assisted synthesis of single-phase ZnGa2-x-yEuxTbyO4 nanophosphors in 10 min with high yields (>90) at a low temperature of 200 °C. The structural and optical properties of the ZnGa2-x-yEuxTbyO4 were studied by XRD, HR-TEM, FT-IR, diffuse reflectance, and photoluminescence (PL) spectroscopy. Annealing improved the crystallinity, and the emission colour shifted from blue to the balanced white light region. The CIE coordinates confirmed that the 800 °C annealing is suitable to get balanced white light. Tb3+-to-Eu3+energy transfer is demonstrated by varying the doping concentrations. Balanced white light was achieved by tuning the emission color of ZnGa2-x-yEuxTbyO4 with optimized Tb3+and Eu3+doping. ZnGa1.975Eu0.01Tb0.015O4 annealed at 800 °C showed balanced white light with CIE coordinates (x, y) = (0.32, 0.33), colour temperature Tcp = 5975 K and average colour rendering index (CRI) Ra = 90. These values suggest that the 800 °C-annealed ZnGa1.975Eu0.01Tb0.015O4 is a competitive phosphor for the generation of white light with good colour reproducibility. © 2022 Royal Society of Chemistry. All rights reserved.

Item Type:	Journal Article
Publication:	New Journal of Chemistry
Publisher:	Royal Society of Chemistry
Additional Information:	The copyright for this article belongs to Royal Society of Chemistry
Keywords:	Color; Crystallinity; Energy transfer; Light emission; Lighting; Phosphors; Photoluminescence spectroscopy; Synthesis (chemical); Temperature, CIE coordinates; Emission color; Higher yield; Luminescent nanoparticle; Microwave assisted synthesis; Nanophosphors; Single phasis; White light; White light emission; White light emitting diodes, Annealing
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	18 May 2022 11:06
Last Modified:	18 May 2022 11:06
URI:	https://eprints.iisc.ac.in/id/eprint/71860

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