Eu~(2+)-Yb~(3+)共掺磷酸盐玻璃中的合作能量传递(英文)

报道了在Eu2+-Yb3+共掺磷酸盐中,一个紫外光子(320nm)通过下转换发光变成两个近红外光子(约1 000nm)的现象.测试了不同样品的吸收、激发和发射光谱,证明了在本玻璃体系中量子剪裁现象的存在;Eu2+离子5d-4f能级发光的衰减曲线证明Eu2+到Yb3+之间的合作能量传递;用I-H理论模型拟合衰减曲线说明了能量传递的过程.最后计算出了能量传递的效率,当Yb3+浓度为1.0mol%时效率为23.05%,当其增加到2.0mol%时,能量传递效率提高到了53.6%.

Cooperative Energy Transfer in Eu2+-Yb3+ Codoped Phosphate Glasses

Downconversion luminescence of one UV photon (320 nm) cut into two near-infrared photons (around 1 000 nm) was reported in Eu²⁺-Yb³⁺ co-doped phosphate glasses. Absorption, excitation and emission spectra were carried out to demonstrate the occurrence of quantum cutting in this system. The experimental evidences of the cooperative energy transfer from Eu²⁺ to Yb³⁺ were presented by the decay curves of 5d→4f emission of Eu²⁺ ions. Luminescence decay curves of Eu²⁺ emission were recorded as a function of the Yb³⁺ concentration and analyzed by using Inokuti-Hirayama's model for energy transfer. Energy transfer efficiency was also calculated to be 23.05% for the Eu²⁺-1.0Yb³⁺ co-doped sample, and 53.6% increased for the Eu²⁺-2.0Yb³⁺ co-doped sample.