高等学校化学学报

高等学校化学学报 ›› 1982, Vol. 3 ›› Issue (S1): 7.

• 研究论文 • 上一篇    下一篇

溴氧化镧铽稳定性的研究

苏勉曾, 王彦吉   

  1. 北京大学化学系
  • 收稿日期:1981-11-19 出版日期:1982-12-31 发布日期:1982-12-31

STUDY ON THE STABILITY OF TERBIUM ACTIVATED LANTHANUM OXYBROMIDE

Su Mianzeng, Wang Yanji   

  1. Department of Chemistry, Peking University, Beijing
  • Received:1981-11-19 Online:1982-12-31 Published:1982-12-31

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摘要：

本文利用热分析、固体电阻率的测定、化学分析、红外吸收光谱分析和X射线粉末衍射分析等方法研究了在程序升温条件下LaOBr受潮变质的过程,确定其反应机理是:LaOBr+H2O < 160℃ LaOBr·H2O 160℃ La(OH)2Br;确定了LaOBr:Tb受潮变质后的产物LaOBr·H2O:Tb和La(OH)2Br:Tb在阴极射线激发下不发光。La(OH)2Br在空气中加热到360℃时又脱水而生成LaOBr,还研究了影响LaOBr稳定性的因素,确定了对LaOBr稳定性有利的合成反应条件。

Abstract:

In order to explain the reason why the phosphor LaOBr:Tb gradually loses its luminescence ability in an atmospheric condition, the action of water vapor on the matrix compound LaOBr has been investigated. The experimental methods used in this investigation were differential thermal analysis, thermal gravimetry, electroresistivity measurement, chemical analysis, infrared absorption spectrophotometry, and x-ray diffractometry. Reaction mechanism between water vapor and LaOBr has been identified as follows: LaOBr+H2O < 160℃ LaOBr·H2O 160℃ La(OH)2Br The two intermediate products (activated by terbium) are nonluminescent. The finally restored LaOBr:Tb formed by the dehydration of La(OH)2Br at 360℃ exhibits only a rather weak luminescence.Moreover several factors in the preparation process have been proved to have influence on the chemical as well as luminescent stability of terbium activated lanthanum oxybromide.

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