Photoluminescence Properties and Quantum Efficiency of Eu³⁺/Mn²⁺- Doped ZnMoO₄ Red Phosphor

Abstract:

In this work, fabrication and characterization of a nanostructured rare-earth-doped ZnMoO₄ will be reported. Photoluminescence properties and quantum efficiency of the rare-earth-doped ZnMoO₄ with different dopant concentrations have been investigated. These samples were synthesized by sol-gel method. Lattice structure of the fabricated samples was characterized by X-ray powder diffraction (XRD); absorption spectrum was performed on UV-2600 photo spectrometer; PL excitation and emission spectra were recorded by Fluorescence Spectrometers; quantum efficiency was measured by an integrating sphere photoluminescence (PL) system. The results showed that the optimized doping concentration of Eu³⁺ was around 10 mol% for the highest quantum efficiency at 616 nm emission peak and 465 nm excitation peak. The highest internal quantum efficiency was 91% at low power density excitation (around 50 μW/mm²). Introduction of Mn²⁺ to Eu³⁺-doped ZnMoO₄ lead to reduced quantum efficiency and electronic lifetime, which can be attributed to defects inside the crystal lattice and energy transfer from Eu³⁺ to Mn²⁺ (more non-radiative transition occur).

• Periodical: Key Engineering Materials (Volume 843)
• Pages: 70-78
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.843.70
• Online since: May 2020
• Authors: Fan Chen, Mustafa Hasan Balci, He Xin Xia, Muhammad Nadeem Akram, Xu Yuan Chen*
• Keywords: Eu³⁺/Mn²⁺- Doped ZnMoO₄, Photoluminescence, Quantum Efficiency

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