Local microstructural analysis for Y_2O_3/Eu~（3＋）/Mg~（2＋） nanorods by Raman and photoluminescence spectra under high pressure

• Published in: 中国物理B：英文版 Vol. 26; no. 2; pp. 357 - 362
• Main Author: 王金华 李泽朋 刘波 刘冰冰
• Format: Journal Article
• Language: English
• Published: 2017
• Subjects: 光致发光光谱; 场离子; 微观分析; 拉曼光谱; 掺杂离子; 欧盟; 纳米棒; 高压力
• ISSN: 1674-1056; 2058-3834

In this paper, we investigate the Raman and photoluminescence spectra of Y_2O_3/Eu~（3＋） and Y_2O_3/Eu~（3＋）/Mg~（2＋） nanorods under high pressures using 514-nm and 532-nm laser light excitation. We observe transitions from the initial cubic phase to amorphous at pressures higher than 24 GPa for both Y_2O_3/Eu~（3＋） and Y_2O_3/Eu~（3＋）/Mg~（2＋） nanorods. In addition, Y_2O_3/Eu~（3＋） and Y_2O_3/Eu~（3＋）/Mg~（2＋） nanorods exhibit different distorted states after the pressure has been raised to 8 GPa. The analyses of intensity ratios, I_（0-2）/I_（0-1） from ~5D_（0–）~7F2_to~5D_（0–）~7F_1and I_（0-2）A/B of ~5D_（0–）7F_2 transitions indicate that Y_2O_3/Eu~（3＋）/Mg~（2＋） nanorods exhibit stronger local micro-surrounding characteristics for Eu~（3＋） ions in a pressuremodulated crystal field. The doped Mg2＋ion results in reducing the crystal ionicity in the distorted lattice state under high pressures. The use of doped ions as an ion modifier can be applied to the study of small local microstructural changes through Eu~（3＋） luminescence.