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Investigation of photoluminescence and dielectric properties of europium-doped LaOCl nanophosphor and its Judd–Ofelt analysis

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Abstract

Present Phosphor La1−xEuxOCl (0 ≤ x ≤ 0.09) was synthesized via conventional solid-state method at a temperature of 700 °C for a duration of 2 h. The compound crystallized in the tetragonal structure with space group P4/nmm (No. 129). The intensity of transition 5D0 → 7F2 (617 nm) was found to be more intense in the photoluminescence spectra. Intensity parameters and radiative properties like radiative lifetime, transition probabilities, and branching ratio are evaluated employing of the Judd–Ofelt theory. At room temperature for a frequency range of 10 Hz—8 MHz, AC conductivity, dielectric properties of La1−xEuxOCl (0.01 ≤ x ≤ 0.09) are studied. Studies indicate that above 30 kHz till100 kHz, the AC conductivity establishes slowly and at 300 kHz increases rapidly. Greater values of dielectric constant and loss were exhibited towards lower frequencies which then declined significantly with increasing frequency making the phosphor suitable for microwave device applications. The CIE color coordinates results of Eu3+-activated LaOCl phosphor (0.642, 0.358) were closer to the commercial red phosphors such as Y2O3:Eu3+(0.645, 0.347), Y2O2S:Eu3+ (0.647, 0.343) and National Television System Committee (NTSC) (0.67, 0.33) resulting in making LaOCl:Eu3+behaves as a promising material for red phosphor materials.

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Authors and Affiliations

  1. Department of Physics, Don Bosco Institute of Technology (Affiliated to Visveswaraya Technological University - Belagavi), Bangalore, Karnataka, 560 074, India

    S. R. Yashodha

  2. Centre for Advanced Materials Research Lab, Department of Physics, BMS Institute of Technology and Management (Affiliated to Visvesvaraya Technological University - Belagavi), Bangalore, Karnataka, 560 064, India

    S. R. Yashodha & N. Dhananjaya

  3. Nano-Composites and Materials Research Lab, Department of Physics, Siddaganga Institute of Technology (Affiliated to Visveswaraya Technological University - Belagavi), Tumakuru, Karnataka, 572 103, India

    S. R. Manohara

  4. Department of Physics, Sai Vidya Institute of Technology (Affiliated to Visveswaraya Technological University - Belagavi), Bangalore, Karnataka, 560 064, India

    H. S. Yogananda

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Yashodha, S.R., Dhananjaya, N., Manohara, S.R. et al. Investigation of photoluminescence and dielectric properties of europium-doped LaOCl nanophosphor and its Judd–Ofelt analysis. J Mater Sci: Mater Electron 32, 11511–11523 (2021). https://doi.org/10.1007/s10854-021-05726-8

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