SrAl_(12)O_(19):Pr^(3+)中~1S_0能级的电子-振动跃迁

Vibronic Transition of ~1S_0 State in SrAl_(12)O_(19):Pr^(3+)

稀土离子Pr3+4f2组态中的的高激发态1S0的光谱性质与其他4f2能级有显著的差别。分析了SrAl12O19∶Pr的1S0→1I6和1S0→1D2发射光谱,跃迁分别属于Δ过程和M过程;指认了其中的零声子线和电子-振动跃迁线。这两组跃迁中,电子-振动跃迁强度与零声子跃迁强度之比大于文献中报道的低激发态中的值,表明1S0与4f5d态的混杂增强了它的电子-声子耦合。

Spectroscopic properties of the high-lying ^1S0 state in the 4f^2 configuration of trivalent praseodymium ions are dramatically different from the other 4f^2 states. ^1S0→^1I6 and ^1S0-^1D2 emission spectra of SrAlnO19：Pr were analyzed in this paper. Vibronic transitions in these emissions were categorized into △ process and M process, respectively. Zero phonon and vibronic lines in the spectra were assigned. The ratio of the vibronic transition intensity and the zero phonon emission intensity was much larger than that for lowlying 4f^2 states reported in literatures, that indicated the mixing of the ^1S0 state with the states in 4fSd configuration enhanced its electron-phonon coupling.