Intense Visible Upconversion Luminescence of Rare Earth Niobate Phosphors
Er3+ and Yb3+ co-doped rare earth niobate phosphors have been prepared by means of conventional solid state synthesis in the air. The structures of YNbO4: Er, Yb, LaNbO4: Er, Yb and GdNbO4 : Er, Yb were characterized by XRD. Their normal and upconversion luminescent spectra with excitation of xenon arc lamp and 980 nm laser diodes have comparatively studied. The Er3+ and Yb3+ co-doped rare earth niobate phosphors show intense green and weak red emissions, which are respectively originated from the typical transitions 2H11/2, 4S3/2 -4I15/2 and 4F9/2-4I15/2 of Er3+. The weak blue emission at about 409 nm, 415 nm and 480 nm are respectively associated with the transitions of Er3+ from excited states 2H9/2 , 4F5/2 and 4F7/2 to ground state 4I15/2, indicating the rare earth niobates possess low phonon-energy. The influence of the Er3 + and Yb3+ concentration on the upconversion intensity of Er3+ in YNbO4 has been investigated. The mechanisms of the upconversion luminescence of Er3+ have been proposed.
Upconversion Niobate Photoluminescence
Y. X. Pan C. H. Yang X. F. Min Q. Y. Zhang
Key Lab of Special Functional Materials of Ministry of Education and Institute of Optical communication,South China University of Technology, Guangzhou 510641, China
国际会议
上海
英文
1039-1042
2007-03-12（万方平台首次上网日期，不代表论文的发表时间）