Enhancement of Blue Emission via Upconversion in Solid-state Synthesized Hexagonal NaYF4∶Ln3+
Hexagonal NaYF4∶Ln3+ (Ln3+=Yb3+ and Tm3+) was prepared via solid-state synthesis route.The synthesized powders were identified with X-ray diffraction pattems.Hexagonal phase was obtained by heating the powders at 550℃ in reducing atmosphere,and the ions of Yb3+ and Tm3+ were completely incorporated into the lattice of hexagonal NaYF4 in the doping concentration range.Microstructure of the phosphor was observed by scanning electron microscopy (SEM).Intense blue (1G4→3H6,1D2→3F4) and weak red (1G4→3F4) upconversion emission of Tin3+ ions with the energy transferred from Yb3+ ions were observed in the phosphor excited with a 980nm continuous wave laser diode.The intensity of blue emission was effectively enhanced by suitable doping of Tm3+ and Yb3+ ions,and strongest blue emission was obtained with the concentration of 0.2mol% Tm3+ and 40mol% Yb3+ doped.
Upconversion Luminescence Solid-state synthesis NaYF4
Youna Wu Changhua Cheng Zhaoxian Xiong
College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China
国际会议
The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))
长沙
英文
398-401
2007-05-10（万方平台首次上网日期，不代表论文的发表时间）