Single-phase white-emitting and tunable color phosphor Na_(3)Sc_(2)(PO_(4))_(3):Eu^(2+),Dy^(3+): Synthesis, luminescence and energy transfer  

作　　者：Sen Wang Haiyan Wu Xin Wen Yanqing Luo Tao Tan Shengjian Jiao Ran Pang Lihong jiang Su Zhang Da Li Guanyu Liu Chengyu Li Hongjie Zhang 

机构地区：[1]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China [2]University of Science and Technology of China,Hefei 230026,China [3]Zhongke Rare Earth(Changchun)Co.,Ltd.,Changchun 130000,China

出　　处：《Journal of Rare Earths》2022年第4期551-558,I0002,共9页稀土学报（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(2019YFA0709101);the Science and Technology Cooperation Program between Jilin Province and Chinese Academy of Sciences(2019SYHZ0008);R&D Projects in Key Areas of Guangdong Province(2020B0101010001)。

摘　　要：A series of Eu^(2+)/Dy^(3+) single doped and co-doped Na_(3)Sc_(2)(PO_(4))_(3) phosphors were synthesized by the high-temperature solid-state method,and their phase,morphology,and luminescence properties were characterized.Under the excitation of 370 nm,the Na_(3)Sc_(2)(PO_(4))_(3):Eu^(2+),Dy^(3+) phosphor can emit white light whose spectrum is composed of a broad emission band centered at 460 nm and the other three peaks at 483,577,and 672 nm,respectively.There is energy transfer from Eu^(2+)to Dy^(3+)ion in Na_(3)Sc_(2)(PO_(4))_(3):Eu^(2+),Dy^(3+) phosphor due to the good overlap between the emission spectrum of Na_(3)Sc_(2)(PO_(4))_(3):Eu^(2+) and the excitation spectrum of Na_(3)Sc_(2)(PO_(4))_(3):Dy^(3+),which is further confirmed by the fluorescence lifetime decrease of Eu^(2+)ion with the increase of Dy^(3+) concentration.The process of energy transfer is via dipole–quadruple interaction which is confirmed by applying Dexter's theory.By increasing the Dy^(3+)concentration,the color coordinates of the Na_(3)Sc_(2)(PO_(4))_(3):0.01Eu^(2+),xDy^(3+)phosphors can be adjusted from blue to white,and then to yellow.The optimized concentration of Dy^(3+)ions is 4.0 mol%,beyond which the concentration quenching will take place.The Na_(3)Sc_(2)(PO_(4))_(3):Eu^(2+),Dy^(3+)phosphor shows fairly good resistance to thermal quenching behavior,of which the emission intensity at 423 K can maintain 90.3%of the initial value(298 K).These results suggest that the Na_(3)Sc_(2)(PO_(4))_(3):0.01Eu^(2+),xDy^(3+)phosphors have potential applications as the color-tunable or a single-phase white emitting phosphor in white LEDs.

关 键 词：Energy transfer PHOSPHATE LUMINESCENCE Rare earths 

分 类 号：TQ422[化学工程] TN312.8[电子电信—物理电子学]