摘要
测量了Tm∶YVO4 晶体的吸收光谱 ,以 34 6nm、36 3nm(1D2 )、475nm(1G4 )、6 98nm (3 F2 ,3 F3 )和 80 1nm(3 H4 )光激发时的发射光谱 ,以及位于 45 4nm (1D2 → 3 F4 )、475nm (1G4 → 3 H6)、6 46nm (1G4 → 3 F4 )、80 6nm(3 H4 →3 H6)的荧光谱线的激发光谱 ,对测量的结果进行了详细分析 ,解释了离子能级间的跃迁过程。提出了Tm∶YVO4 晶体基质与Tm3 + 之间的能量交换的概念和新的跃迁通道 ,证实了存在1D2 +3 H6→1G4 +3 F4 以及1G4 +3 H6→3 H4 +3 H5的能量传递过程 ,还可能存在交叉弛豫过程 1G4 +3 H6→3 F2 +3 F4 。这些过程使得Tm∶YVO4 晶体难以实现1D2 能级上转换发光 (4 5 4nm左右 ) ,但 475nm的上转换发光 (1G4 →3 H6)较强 ,3 F4 能级是潜在红外激光发射能级。
Absorption spectra, emission spectra induced by 346 nm?363 nm ( 1D 2)? 475 nm ( 1G 4)? 698 nm ( 3F 2, 3F 3) and 801 nm ( 3H 4) light, and excitation spectra of fluorescence spectral lines at wavelengths of 454 nm ( 1D 2→ 3F 4)? 475 nm ( 1G 4→ 3H 6)? 646 nm ( 1G 4→ 3F 4)? 806 nm ( 3H 4→ 3H 6) of trivalent Tm 3+ ion in YVO 4 crystal were measured. Transition processes of the energy levels of Tm 3+ are analyzed in details. The idea of energy transfer and new transition channels between Tm∶YVO 4 host and energy level of Tm 3+ ions were proposed. It is confirmed that there are energy transfer processes including 1D 2+ 3H 6→ 1G 4+ 3F 4 and 1G 4+ 3H 6→\{ 3H 4+ 3H 5, \} cross relaxation process 1G 4+ 3H 6→ 3F 2+ 3F 4 may be present yet. These energy transfers make the upconversion 1D 2→ 3H 6 (454 nm) difficult while the upconversion luminescence of 475 nm ( 1G 4→ 3H 6) is strong and 3F 0 is the potential infrared laser emission energy level.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2001年第11期1392-1395,共4页
Acta Optica Sinica
基金
国家自然科学基金 (6 990 80 0 2 )
