Relationship between Microstructure Evolution and the Luminescent Properties of Eu³⁺-doped Yttrium Aluminum Garnet and Y₂O₃ Nano-powders

Jie Zhang¹，Yongyi Gao²，Junjie Xiao¹，Changfu Xu¹，Yunxin Liu²，Qibin Yang¹

1. Institute of Modern Physics,Xiangtan University2. Department of Physics,Hunan University of Science and Technology

摘 要：<正>Eu³⁺-doped yttrium aluminum garnet（YAG） and Y₂O₃ composite phase nanoparticles were synthesized using a modified hydrothermal method.Sintering was performed at 800℃,which is considerably lower than the sintering temperature used in the conventional method.Y³⁺ in YAG and Y₂O₃ was partially substituted with Na⁺ by adding NaNO₃ into the solution during sample synthesis.The microstructures and phase transformation process were characterized through X-ray diffraction,scanning electron microscopy,and transmission electron microscopy.The obtained results verified that the addition of Na⁺ promoted crystallinity and grain growth of the three phases,namely,Y₂O₃,Y₄AI₂O₉,and Y₃AI₅O₁₂.Highly efficient luminescence properties excited by 254 and 365 nm ultraviolet were achieved.In conclusion,the remarkable enhancement of the luminescence intensity with the addition of Na⁺ should be attributed to grain growth and improvement of crystallinity.

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