Electronic polarizability and Judd-Ofelt parameters of Nd3+ and Er3+ ions in transparent crystallized glasses with nonlinear optical Ba2 TiSi2O8 nanocrystals.
Electronic polarizability and Judd-Ofelt parameters of Nd3+ and Er3+ ions in transparent crystallized glasses with nonlinear optical Ba2 TiSi2O8 nanocrystals.
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具有非线性光学 Ba2 TiSi2O8 纳米晶体的透明结晶玻璃中 Nd3 和 Er3 离子的电子极化率和 Judd-Ofelt 参数。
DOI：
10.1063/1.2908231
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
T. Komatsu
中科院分区：
文献类型：
--
作者：
N. Maruyama;T. Honma;T. Komatsu
为了阐明纳米晶中稀土离子的光学性质，采用常规热处理方法在Eu(2)O(3)-、Nd(2)O(3)-和Er(2)O(3)掺杂的40BaO-20TiO(2)-40SiO(2)玻璃中制备了由非线性光学Ba(2)TiSi(2)O(8)纳米晶组成的透明晶化玻璃。从密度和折射率的值评估结晶玻璃的电子极化率，发现由于纳米结晶化而降低，这表明与前体玻璃相比，结晶玻璃中的化学键合状态更加共价。根据Eu(3+)离子的X射线衍射分析和光致发光光谱，提出稀土离子如Nd(3+)和Eu(3+)被掺入Ba(2)TiSi(2)O(8)纳米晶中。 Nd(3+) 和 Er(3+) 离子的 Judd-Ofelt 参数 Omega(t)（t=2、4 和 6）通过光学吸收光谱进行评估。观察到Nd(3+)和Er(3+)的Omega(2)参数很大程度上由于纳米晶化而增加，这表明纳米晶玻璃中Nd(3+)和Er(3+)离子的位点对称性由于它们并入Ba(2)TiSi(2)O(8)纳米晶体中的Ba(2+)位点而很大程度上扭曲。由于纳米晶化而导致的 Omega(4) 和 Omega(6) 参数的变化很小。提出包含RE离子的非线性光学Ba(2)TiSi(2)O(8)纳米晶作为活性光学材料具有很高的潜力。
Transparent crystallized glasses consisting of nonlinear optical Ba(2)TiSi(2)O(8) nanocrystals are prepared in Eu(2)O(3)-, Nd(2)O(3)-, and Er(2)O(3)-doped 40BaO-20TiO(2)-40SiO(2) glasses by a conventional heat treatment method in order to clarify the optical properties of rare-earth (RE) ions in nanocrystals. The electronic polarizabilities of crystallized glasses are evaluated from the values of density and refractive index, and are found to decrease due to nanocrystallization, which indicates that the chemical bonding state in the crystallized glasses is more covalent compared to the precursor glasses. It is proposed from x-ray diffraction analyses and photoluminescence spectra of Eu(3+) ions that RE ions such as Nd(3+) and Eu(3+) are incorporated into Ba(2)TiSi(2)O(8) nanocrystals. The Judd-Ofelt parameters, Omega(t) (t=2, 4, and 6), of Nd(3+) and Er(3+) ions are evaluated from optical absorption spectra. It is observed that the Omega(2) parameter of Nd(3+) and Er(3+) increases largely due to nanocrystallization, suggesting that the site symmetry of Nd(3+) and Er(3+) ions in nanocrystallized glasses is largely distorted due to their incorporations into the Ba(2+) sites in Ba(2)TiSi(2)O(8) nanocrystals. The change in the Omega(4) and Omega(6) parameters due to nanocrystallization is small. It is proposed that nonlinear optical Ba(2)TiSi(2)O(8) nanocrystals including RE ions would have a high potential as active optical materials.
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