Study on the Luminescence and Energy Level of Lanthanide Ions in Lu0.8Sc0.2BO3 Host

详细信息    查看全文

• 作者：Yuntao Wu ; Guohao Ren ; Martin Nikl ; Dongzhou Ding ; Jiayu Wang ; Shanshan Shang ; Fan Yang ; Shangke Pan
• 刊名：Journal of Physical Chemistry A
• 出版年：2011
• 出版时间：December 1, 2011
• 年：2011
• 卷：115
• 期：47
• 页码：13821-13828
• 全文大小：1034K
• 年卷期：v.115,no.47(December 1, 2011)
• ISSN：1520-5215

文摘

Emission and excitation spectra of undoped and Ln³⁺ (Ln = Ce, Pr, Nd, Yb)-doped Lu_0.8Sc_0.2BO₃ were studied by vacuum ultraviolet spectroscopy, and the X-ray excited luminescence spectra were measured as well at room temperature. The undoped specimen presented two different emissions upon excitation at energies in the vicinity of the band gap or with X-ray. The emission at the highest energy side, located at 4.77 eV, was ascribed to self-trapped exciton, which is anchored by electron capture around the Sc site. We also observed three broad emission bands at 4.43, 3.02, and 2.10 eV, which might be attributed to the trapped exciton, defect -related emissions, or both. Energy transfer processes to the doped lanthanide ions in Lu_0.8Sc_0.2BO₃ via exciton state or sequential electron鈥揾ole capture are discussed. Finally, the energy level diagram for divalent and trivalent lanthanides in Lu_0.8Sc_0.2BO₃ was constructed using the obtained spectroscopic parameters and the three parameters method (Dorenbos, P. J. Phys.: Condens. Matter2003, 15, 8417).