Ultraviolet radiation excited strong red-emitting LaAlO3:Eu3+ nanophosphors: Synthesis and luminescent properties
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- 作者：Soo Hyun Lee ; Peng Du ; L. Krishna Bharat ; Jae Su Yu ; jsyu@khu.ac.kr
- 关键词：Phosphors ; Luminescence ; Judd-Ofelt theory ; Cathodoluminescence
- 刊名：Ceramics International
- 出版年：2017
- 出版时间：1 April 2017
- 年：2017
- 卷：43
- 期：5
- 页码：4599-4605
- 全文大小：1294 K
- 卷排序：43
文摘
We synthesized the trivalent europium ions (Eu3+) 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 (O2- to Eu3+ ions) under 320 nm illumination, the featured emissions of Eu3+ ions were detected in all the compounds. The optimum doping concentration of Eu3+ 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 Eu3+-doped LAO nanoparticles a promising red-emitting phosphor for both ultraviolet-based white light-emitting diodes and field-emission displays.