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

Deepak Hebbar N., K. S. Choudhari, Nimai Pathak, S. A. Shivashankar, Suresh D. Kulkarni

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)6103-6113
Number of pages11
JournalNew Journal of Chemistry
Issue number13
Publication statusPublished - 05-03-2022

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Materials Chemistry


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