物理化学学报 >> 1999, Vol. 15 >> Issue (02): 150-155.doi: 10.3866/PKU.WHXB19990211

研究论文 上一篇    下一篇

Al2O3-B2O3-Eu2O3体系的振动光谱和发光特性

尤洪鹏, 洪广言   

  1. 中国科学院长春应用化学研究所,长春 130022
  • 收稿日期:1998-04-14 修回日期:1998-07-16 发布日期:1999-02-15
  • 通讯作者: 洪广言

Vibrational Spectrum and Luminescence Properties of the System Al2O3-B2O3-Eu2O3

You Hong-Peng, Hong Guang-Yan   

  1. Changchun Institute of Applied Chemistry,The Chinese Academy of Sciences,Changchun 130022
  • Received:1998-04-14 Revised:1998-07-16 Published:1999-02-15
  • Contact: Hong Guang-Yan

摘要:

采用高温固相反应法,合成了一系列不同组份的磷光体,测定了它们的振动光谱.结果表明,随着Al/B比的减小,在1100~1000cm-1的区域内的振动光谱没有明显变化,铕离子不可能进入Al18B4O33的晶格中;振动光谱的背底升高,非晶相逐渐增加.研究了Al2O3-B2O3-Eu2O3中Eu3+离子的光谱特性,发现随着Al/B比的减少,Eu3+离子的存在相由晶相逐渐向非晶相转化。在非晶相中,Eu3+离子的声子伴带表明电子与声子的耦合强度随着Al/B比的减少而减小,Eu3+离子的发射强度相应的增加,这与多声子弛豫的理论一致.

关键词: Eu3+离子, 振动光谱, Eu3+离子的光谱特性, 声子伴带

Abstract:

The system Al2O3-B2O3-Eu2O3, with Al/B ratio varying from 4.5 to 2 and Eu/(Al+B)=0.02, was synthesized by solid state reaction. The vibrational spectra of the sys tem Al2O3-B2O3 were investigated. It was found that no definite change in the regions of 12001000cm-1 due to the absorption BO4 groups with decreasing Al/B ratio, indicating no Al3+ion was substituted by Eu3+ ions and other changs revealed that there was an amorphous phase and Eu3+ ions may dope into the amorphous phase. The studies on the luminescent properties of the system Al2O3-B2O3 also show that Eu3+ ions dope into amorphous phase. The investigations on the phonon sideband of Eu3+ indicate that electron-phonon coupling strength decreases with Al/B ratio change from 3 to 2, leading to the non-radiative decay rate decreases and the Eu3+ennssion intensity increase.

Key words: Eu3+ ions, Vibrational spectra, Luminescent properties of Eu3+ ion, Phonon sideband