基于合作能量传递的Sm~(2+)离子上转换发光

报道了Sm~(2+)离子的上转换发光。在实验上证明了变价镧系离子同样可以作为上转换材料的发光中心。在近红外光的激发下,复合Ba FCl_(0.5)Br_(0.5)∶1%Sm~(2+)-Ca F_2∶1%Yb~(3+)化合物发出红色上转换发光。上转换发射光谱中位于631,644,665,689,704,729 nm的特征发射分别来自于样品中Sm~(2+)的~5D_i(i=0,1)→~7F_j(j=0,1,2)特征跃迁。根据动力学分析及光子数拟合的结果,我们将二价Sm离子的上转换过程归因于合作能量传递,即:两个同时被激发的Yb~(3+)离子合作将能量传递给一个Sm~(2+)离子。

Upconversion Luminescence of Sm2+ Ions Based on Cooperative Energy Transfer

We report the observation of upconversion luminescence from Sm2+ ions, which demon-strate that changeable valence lanthanides can served as the ions for optical frequency transforma-tion. Upon the excitation of 980 nm diode laser, the doped Sm2+ ions in the hybrid material of BaF-Cl0. 5 Br0. 5:1%Sm2+-CaF2:1%Yb3+ emit red upconversion fluorescence peaked at 631, 644, 665, 689, 704, 729 nm from the 5 D0,1→7 F0,1,2 transitions, respectively. By transient dynamic analysis, we attribute the excitation of Sm2+ ions to the cooperation energy transfer process:two excited Yb3+ions simultaneously transfer their energy to one Sm2+ ion.