报道了Sm2+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BaFCl0.5Br0.5∶1%Sm2+-CaF2∶1%Yb3+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Sm2+的5Di(i=0,1)→7Fj(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Yb3+离子合作将能量传递给一个Sm2+离子。

We report the observation of upconversion luminescence from Sm2+ ions, which demonstrate that changeable valence lanthanides can served as the ions for optical frequency transformation. Upon the excitation of 980 nm diode laser, the doped Sm2+ ions in the hybrid material of BaFCl0.5Br0.5∶1%Sm2+-CaF2∶1%Yb3+ emit red upconversion fluorescence peaked at 631, 644, 665, 689, 704, 729 nm from the 5D0,1→7F0,1,2 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.