Electric-field-induced composite color centers formation and Yb ions valence state change in spark plasma sintered Yb:YAG transparent ceramics
Electric-field-induced composite color centers formation and Yb ions valence state change in spark plasma sintered Yb:YAG transparent ceramics
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DOI：
10.1016/j.optmat.2019.109192
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发表时间：
2019-09
影响因子：
3.9
通讯作者：
Xingtao Chen;Yiquan Wu;T. Lu;N. Wei;Yiyu Li;Tengfei Hua;Qiang Zeng
中科院分区：
文献类型：
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作者：
Xingtao Chen;Yiquan Wu;T. Lu;N. Wei;Yiyu Li;Tengfei Hua;Qiang Zeng
采用放电等离子烧结技术，在不添加任何添加剂的情况下，制备了具有亚微米级晶粒的Yb：YAG透明陶瓷。用可见吸收光谱、发射光谱和电子顺磁共振（EPR）研究了Yb的价态位移和复合色心的形成。详细讨论了外加电场影响价态跃迁和复合色心形成的机制。在1100-1300 °C下对SPS烧结Yb：YAG陶瓷的吸收光谱进行了测量，发现Yb：YAG陶瓷的吸收带位于380、487、524、634、646和654 nm处。EPR表征和光致发光光谱证实了Yb 2+离子在354 nm激发下589 nm的发光，其基态电子构型为4f 13，是Yb 3+离子捕获电子形成Yb 2 +-F+复合色心的结果。据确定，在Yb价态的位移和复合色心的形成所造成的电场进行烧结过程。
Transparent Yb:YAG ceramics with submicron-scale grains were fabricated through the spark-plasma-sintering of co-precipitated Yb:YAG powders without the use of any additives. Yb valence state shift and composite color center formation were investigated by visible range absorption spectra,Emission spectra and Electron Paramagnetic Resonance (EPR) measurements. The underlying mechanisms by which an applied field influences the valence state transition and composite color center formation are discussed in detail. Absorption spectra measurements of Yb:YAG ceramics consolidated by SPS at 1100–1300 °C revealed absorption bands located at 380, 487, 524, 634, 646, and 654 nm. EPR characterization and photoluminescence spectrum confirmed the presence of a Yb2+ion population with the 4f13ground state electronic configuration by the 589 nm luminescence under 354 nm excitation, formed by the Yb3+ion capturing an electron to form Yb2+-F+composite color centers. It was determined that both the shift in Yb valence state and the formation of composite color centers were caused by the electric field employed to conduct the sintering process.