Synthesis and luminescent properties of Ba2V2O7：Sm^3＋  

作　　者：李飞 方宏威 陈永虎 

机构地区：[1]Department of Physics, University of Science and Technology of China, Hefei 230026, China

出　　处：《Journal of Rare Earths》2017年第2期135-141,共7页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(11574298,11374291,11274299)

摘　　要：Samarium doped pyrovanadate Ba_2V_2O_7：Sm^3＋ phosphors were synthesized by traditional high-temperature solid-state reaction method. The phase and the structure of the samples were characterized by powder X-ray diffraction（XRD）, and the luminescent properties and the energy transfer mechanism of the material were investigated using quantitative photoluminescence（PL） spectroscopy. The excitation spectrum of the sample exhibited a broad ultraviolet（UV） band with maximum at around 341 nm due to V–O charge transfer transition of the host. The emission spectrum displayed a yellow-greenish broadband（peaking at around 498 nm） coming from the host Ba_2V_2O_7 and three narrow peaks（at 561, 599 and 646 nm） attributed to the dopant Sm^3＋ ions. The PL spectra revealed the energy transfer from the host to the Sm^3＋ ions. In addition, the color coordinates and the color temperature of the phosphor Ba_（1.95）V_2O_7：5%Sm^3＋ were（0.314, 0.365） and 6135 K, respectively, under 365 nm excitation, suggesting it to be a candidate of single-phase converting phosphors for white-light-emitting diodes（WLEDs） with near-UV chips.Samarium doped pyrovanadate Ba_2V_2O_7：Sm^3＋ phosphors were synthesized by traditional high-temperature solid-state reaction method. The phase and the structure of the samples were characterized by powder X-ray diffraction（XRD）, and the luminescent properties and the energy transfer mechanism of the material were investigated using quantitative photoluminescence（PL） spectroscopy. The excitation spectrum of the sample exhibited a broad ultraviolet（UV） band with maximum at around 341 nm due to V–O charge transfer transition of the host. The emission spectrum displayed a yellow-greenish broadband（peaking at around 498 nm） coming from the host Ba_2V_2O_7 and three narrow peaks（at 561, 599 and 646 nm） attributed to the dopant Sm^3＋ ions. The PL spectra revealed the energy transfer from the host to the Sm^3＋ ions. In addition, the color coordinates and the color temperature of the phosphor Ba_（1.95）V_2O_7：5%Sm^3＋ were（0.314, 0.365） and 6135 K, respectively, under 365 nm excitation, suggesting it to be a candidate of single-phase converting phosphors for white-light-emitting diodes（WLEDs） with near-UV chips.

关 键 词：phosphor Ba_2V_2O_7 Sm^3＋ luminescence WLED rare earths 

分 类 号：TQ422[化学工程]