Ultraviolet radiation excited strong red-emitting LaAlO3:Eu3+ nanophosphors: Synthesis and luminescent properties. Issue 5 (1st April 2017)

• Record Type: Journal Article
• Authors: Lee, Soo Hyun; Du, Peng; Bharat, L. Krishna; Yu, Jae Su
• Is Part Of: Ceramics international. Volume 43:Issue 5(2017)
• Page Start: 4599
• Page End: 4605
• Publication Date: 2017-04-01
• Subjects: Phosphors -- Luminescence -- Judd-Ofelt theory -- Cathodoluminescence; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.12.123
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: We synthesized the trivalent europium ions (Eu 3+ ) doped lanthanum aluminate (LaAlO3, LAO) nanophosphors by a solvothermal method. Their structural, morphological, and luminescent properties were systematically investigated. The obtained nanoparticles possessed single nanocrystallinity with a rhombohedral structure. For the excitation originating from the charge transfer band (O 2- to Eu 3+ ions) under 320 nm illumination, the featured emissions of Eu 3+ ions were detected in all the compounds. The optimum doping concentration of Eu 3+ ions in LAO was about 9 mol% and the concentration quenching was dominated by dipole-dipole interaction. Furthermore, the Judd-Ofelt (J-O) theory was used to estimate the J-O intensity parameters. Based on the temperature-dependent PL emission spectra, the thermal stability was analyzed and the activation energy was obtained to be 0.234 eV. Meanwhile, the decay time, color coordinate/purity, and cathodoluminescence behaviors of the synthesized nanophosphors were also studied. These characteristics make the Eu 3+ -doped LAO nanoparticles a promising red-emitting phosphor for both ultraviolet-based white light-emitting diodes and field-emission displays.