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

• Published in: Key engineering materials 2020-05, Vol.843, p.70-78
• Main Authors: Chen, Fan, Akram, Muhammad Nadeem, Balci, Mustafa Hasan, Xia, He Xin, Chen, Xu Yuan
• Format: Article
• Language: English
• Subjects: Absorption spectra; Crystal defects; Crystal lattices; Crystal structure; Efficiency; Emission spectra; Energy; Energy transfer; Europium; Excitation; Excitation spectra; Integrating spheres; Molybdenum; Nitrates; Phosphors; Photoluminescence; Quantum efficiency; Rare earth elements; Sol-gel processes; Spectrometers; X ray powder diffraction; Zinc
• ISSN: 1013-9826; 1662-9795; 1662-9795
• DOI: 10.4028/www.scientific.net/KEM.843.70

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).