A potential red-emitting phosphors scheelite-like triple molybdates LiKGd_2(MoO_4)_4:Eu^(3+) for white light emitting diode applications  

作　　者：XIE An YUAN XiMing WANG FengXiang 

机构地区：[1]Department of Mechanical Engineering, Xiamen University of Technology, Xiamen 361024, China [2]Engineering Research Center of Nano-Mineral Materials and Application, Ministry of Education, China University of Geosciences, Wuhan 430074, China

出　　处：《Science China(Technological Sciences)》2011年第1期70-75,共6页中国科学（技术科学英文版）

基　　金：supported by the Major Science and Technology Projects of Wuhan City Science and Technology Bureau (Grant No.200810321148)

摘　　要：A series of novel red-emitting phosphors scheelite-like triple molybdates LiKGd2.xEux（MoO4）4（0.1≤ x ≤ 1.9） were synthesized by solid state reaction method and their photoluminescence properties were investigated. The photoluminescence results show that all samples can be excited efficiently by UV （396 nm） light and blue （466 nm） light and emit red （615 nm） light with line spectra, which are coupled well with the characteristic emission from UV-LED and blue LED, respectively. The experimental results and their analysis suggest that the energy transfer occurs due to dipole-dipole interactions among Eu3＋ ions in LiKGd2-xEux（MoO4）4. Compared with Cao.8MoO4： Eu0.2^3-, the emission intensity of LiKGdo.9（MoO4）4： Eu1.1^3- is about 1.4 times higher and the CIE chromaticity coordinates are as close to the National Television System Committee （NTSC） standard values as those of Cao.8MoO4： Eu0.2^3-. The optical properties suggest that LiKGdo.9（MoO4）4： Eu1.1^3- is an efficient red-emitting phosphor for white LEDs applications.

关 键 词：PHOSPHOR triple molybdates LiKGd2-xEux（MoO4）4 white LEDs 

分 类 号：TN104.3[电子电信—物理电子学] TN312.8